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MSI-3750 Digital Weight Indicator

◆

User Guide

Page 73

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

Figure 8

TEST SET POINT RELAYS

To test the connections and exercise the relays use the following procedure.
1)

Push

SETUP

followed immediately by the SET POINTS key (usually

F2

).

Push

ENTER

. You are now in the SET POINTS menu.

2)

Use the

DOWN

key to scroll to the “TEST SP” selection. Push

ENTER

.

3)

Use the

UP

key to step progressively through each set point. Each relay will

turn on in succession and the message display indicates which set point
relay is activated.

4)

When done testing the relays push

EXIT

twice to return to normal scale

operation.

Driving External Relays with Setpoint 8

External

Relay

+24V Typ

+24V

Return

10k

Ω

Resistor

Logic Level

N-Chan

Power MOSFET

D

G

S

TTL LO

GND

TTL HI

Setpoint 8

Isolated

Ground

Isolated

+5V

WARNING

This procedure will turn on and off any device connected to the relays.
Make sure that doing so will not cause a safety hazard or damage prop-
erty or goods.

WARNING

Potentially fatal voltages are present within the meter! Always remove
power from the meter and your circuit before opening the cabinet and
connecting the relay circuits. Ensure that the conductors to your circuit
are securely fastened in the terminal block and that the cable is securely
fastened in the watertight fitting. All wiring should comply with local
electrical codes.

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Summary of Contents for MSI-3750

Page 1: ...ELECTRONIC DIGITAL WEIGHT INDICATOR User Guide Quality Industrial Weighing and Force Measurement Equipment Measurement Systems International ...

Page 2: ... A Grading Scale 67 Relay Output Option 69 Relay Applications 70 Logic Output Set Point 8 72 Test Set Point Relays 73 SECTION 7 COMMUNICATION PORTS 74 Electrical Conformance 74 Comm Port Cabling 75 Data Configuration 78 Output Control 78 Comm Port Setup Menu 80 Comm Port Parameters Menu 81 Printer Output Formatting 85 Example Printer Formatting 88 Programming The End Of Line String 91 Editing The ...

Page 3: ...Digital calibration makes maintaining the scale a snap and the single board marine proof NEMA 4 construction makes for a rugged and reliable scale An option card can be plugged in which provides 7 set point relays a Logic Output and an additional isolated RS232 port or RS 485 port A Statistics option is available for process or production monitoring of up to 350 ID Codes The 3750 is designed to me...

Page 4: ...POINT TOTAL 1 2 MSI 3750 SEATTLE WASHINGTON U S A TOTAL VIEWTOTAL SET POINTS ID UNITS max max III n 5 000 III L n 10 000 F1 EXIT F2 UV F3 F4 F5 TARE T ASCII 5 MNO ENTER SETUP EXIT POWER ZERO 0 CLR 9 YZ B G INSERT NET GROSS ALPHA A a 1 1 ABC 0 SPACE 6 PQR 7 STU 2 DEF PRINT 3 GHI 4 JKL 8 VWX Programable Function Keys Alpha numeric Keys 3750 FRONT PANEL ...

Page 5: ...long life LED back lighting coupled with a transflective LCD to provide optimum display contrast under all ambient conditions from full sunlight to total darkness Operation is light sensing automatic or manually set Versatile power input options AC Only 90 260 VAC 45 65 Hz 9 36 VDC Input 18 60VDC and two D Cell Battery operation Accessory Power Supplies are available to allow 250VDC operation as w...

Page 6: ...battery cap by turning the knob clockwise 6 Optional The batteries can be checked with the Test Mode Power displayed is in relative of battery life If the number with fresh batteries is extremely low 20 turn off the power remove the batteries and check that the polarity of both batteries is correct Low Battery Indication A small Battery Symbol will appear on the LCD when there is approximately 10 ...

Page 7: ... for wiring diagrams 5 After pulling lightly on the wires to check for firm connection take the slack out of the load cell cable as you close up the case 6 Tighten the liquid tight feedthrough connector to ensure a watertight enclosure 7 Put 2 screws in the front panel to hold it in place Restore the power batteries or AC 8 Refer to the calibration section If this is a first time hookup of this ca...

Page 8: ...ient voltage depends on power option 2 Ambient temperature must be between 20 C to 60 C POWER oz lb 25 AUTO SETUP RF LINK REMOTE da PM N 0 50 75 100 METRIC LEVEL RF LEVEL 0 1 Push POWER The system performs a display check All segments and the Set Point Total LED s illuminate for 3 seconds then turn off for 1 2 second 2 The LCD displays 3750 and the software version number 3 The Microcontroller tes...

Page 9: ...range amount TARE Tare is typically used to zero out a known weight such as a packing container or pallet and display the load in NET weight A Tare value is entered in one of three ways 1 AUTO TARE When the TARE key is pushed twice or once if the Tare Mode is Auto the current weight is zeroed and Net Weight is displayed 2 KEYBOARD TARE Using the numeric keys the operator keys in the desired Tare W...

Page 10: ... value in the current ID Code memory until cleared Each available ID Code can store independent Tare values To Read the Tare Value without changing it TARE key function must be set to KBD UPDN TARE T ASCII TARE T ASCII N NET INDICATION 1 Push TARE The current Tare value is displayed Note If the TARE key is setup for AUTO only one push of the TARE key will be necessary 2 Push TARE again Assuming no...

Page 11: ...arily reads TARE CLR Then the scale returns to the GROSS mode TARE T ASCII ZERO 0 1 Push TARE The display reads TARE Any current Tare value is displayed 2 Using the numeric keys input the value desired In this example we ll use 0 5 lb as a Tare Value Note The 3750 will automatically place a leading zero if the Tare value starts with the decimal point 3 The Tare Value 0 5 is displayed Push ENTER to...

Page 12: ...nt the Tare value Each single push of the scroll keys will change the current Tare value 1 scale division In this example the scale incre ment is 5 lb 3 The Tare Value 10 5 is displayed Push ENTER to place the value in the Tare Register The display reads TARE SET and displays the Tare value for 1 second All subsequent readings have the Tare value subtracted and are displayed in NET weight Multiple...

Page 13: ...res stored with each ID Code are ignored but not erased Disabling TAREALL will restore the original Tare values TARE ALL is intended for those applications where a common carrier or pallet is used but multiple ID Codes are necessary for data collection AUTO CLR Enabling AUTO CLR causes the 3750 to clear the Tare Value after each lift greater than 0 NET The Tare Value is cleared and the display mod...

Page 14: ...E key mode In this example the AUTO mode is enabled We ll change the mode to KBD UPDN 3 Push the UP key to change the Tare Key mode to KBD UPDN 4 Push ENTER The Scale returns to the SETUP TARE menu 5 Push EXIT to return to normal operation with the TARE key function altered EXIT SETUP SETUP TARE T ASCII TAREMODE UV F3 TAREALL UV F3 AUTO CLR ENTER DISABLED 1 Push SETUP followed immediately by the T...

Page 15: ...UP TARE T ASCII TAREMODE UV F3 TAREALL ENTER DISABLED UV F3 ENABLED ENTER TAREALL EXIT SETUP 1 Push SETUP followed immediately by the TARE switch The first menu choice TAREMODE appears Note If the TARE switch was pushed too late the scale will go into the main SETUP menu Push EXIT and try again 2 Push the UP scroll key to change the menu to TAREALL 3 Push ENTER The first selection is the current T...

Page 16: ...T B G NET GROSS INSERT B G NET GROSS N 1 Starting in the NET weight mode This example has a TARE weight equal to 40 5 lb Push NET GROSS The message will briefly display GROSS All subsequent readings will be Gross weight until the NET GROSS key is pushed again or until the TARE is changed Note If working with an ID Code present the ID Name will return to the message display after the GROSS or NET m...

Page 17: ...owed immedi ately by the UNITS key usually F5 The menu will display UNITS Tons available on capacities 2 000 lb and over Metric Tons available on capacities 1000 kg and over lb oz oz and g available on scales 250 lb and under 2 Push ENTER The unit POUNDS will appear 3 The numeric display will read On if the displayed unit is activated or will read OFF if it is inactivated Use the LEFT or RIGHT Cur...

Page 18: ...PK GROSS to indicate peak hold mode is enabled The display will only update when a greater value than previously recorded is detected To Clear Peak Weight Readings Turn off the Peak mode by pushing the FUNCTION key programmed as PEAK HOLD The 3750 reads PEAK OFF and clears the peak value from memory The display will revert to NET or GROSS mode Note Peak Hold captures data at a reading rate of 7 5 ...

Page 19: ...ery life will vary depending on whether the backlight is on or off d Internal tests are performed to further ensure scale integrity PRINT Sends the current displayed reading to the printer or selected Comm Port unless otherwise setup in the Print Setup menu Any or all weight time date and scale parameter functions can be printed as set in the Comm Port Parameters Menu Refer to Section 7 for more d...

Page 20: ...unction is to be used to input a customer number MSI can supply a label that reads CUSTOMER Contact MSI to order custom Function Key labels EXIT F2 UV F3 F1 F4 F5 Function Default Function Description CLRLATCH Clears any latched Set Points DISABLED Key does nothing GRNDTOTL Gives the grand total of all ID Codes ID NUMBR F1 Push to change the ID Code PEAKHOLD Turns Peak Hold on and off SCALENUM Cha...

Page 21: ...SGN F2 4 Push ENTER The Function Key selection list is shown 5 Use the UP DOWN keys to scroll through all the functions that F2 key can be set to Stop on PEAKHOLD Note If you hold down the scroll key it will start to incre ment automatically 6 Push ENTER to assign the PEAKHOLD function to F2 The display shows the menu item ASSGN F2 7 Push EXIT SETUP twice to return to normal scale operation or ass...

Page 22: ...n of numerals and letters Once the name is entered by the user the 3750 scans its memory to see if the ID Code already exists If it does all new totaled weighments are added to the previously totaled weighments and any preexisting Tare value will be used for NET weight computation If the name did not already exist the 3750 creates a new ID Code ID Codes are alphabetized when created using the stan...

Page 23: ... ASCII chart and the numeric display to verify the identity of the mark The ALPHA Key is used to change the data entry from Numeric to Alpha numeric The LCD indicates n for numeric entry U for upper case Alpha numeric and L for lower case Alpha numeric Alpha numeric Keys When the Alpha key is in the n condition these keys provide direct numeric digits When the Alpha key is in the U condition the k...

Page 24: ... the upper case equivalent on the LCD However when the ID Code is printed or transmitted to a computer the proper lower case character will be sent Font Substitutions F for f P for p X for x 1 Push ID usually F1 The current ID is displayed 2 Push the first digit of the new ID Code In this example the ID Code will be 567 3 Push the second and third numbers Note So far the Enter key has not been nec...

Page 25: ...the STU7 key twice to get the T to appear 4 Push the DEF2 key twice for an E Note So far using the Enter key has not been necessary 5 Push the STU7 key for an S 6 Now in order to get the next T to appear the ENTER key must be pushed so that the cursor will move on to the next character position 7 Push the STU7 key twice to get the T to appear 8 Push the SPACE 0 key to input a space 9 Push the ABC1...

Page 26: ...nate the ID Code entry The 3750 pauses while checking its memory for a match If no match is made the display reads ADD ID 13 The new ID Code appears briefly on the screen Next the 3750 returns to normal scale operation with the new ID Code Any Tare value and new totals will be stored in the new ID Code µ ALPHA A a 1 SETUP 11 1 ABC TEST 1a 12 ENTER TEST 1a_ 12 ENTER SETUP 13 1 Push ID Usually F1 ca...

Page 27: ...included in the grand total The best way to recognize that the default code is in operation is that it has no ID Code name The default ID Code can be given a name using SETUP ID CODES but it will not be alphabetized it will always be first on the list Note The default ID Code is number 1 therefore using the C command see section 7 will always start with 2 for user entered ID Codes To Scroll throug...

Page 28: ... message line Recall or scroll to the ID Code you wish to delete using either of the two methods detailed previously 1 Push ID The current ID is displayed 2 Push the CLR key The message CLR 1 ID appears 3 Push ENTER to delete the ID Code The previous ID Code is deleted and the next ID Code alphabetically will become active Note Push EXIT instead of ENTER to cancel the ID Code delete F1 ID ZERO 0 E...

Page 29: ...ge CLR 1 ID appears 3 Push the CLR key again The message CLR ALL appears 4 Push ENTER to delete all the ID Codes and Total Statistics Registers The 3750 double checks your intent with an R U SURE screen Push EXIT or any other key to cancel Delete All ID Codes 5 Push ENTER again to complete the Clear function It can take a while to clear all the registers The 3750 indicates WAIT while this is occur...

Page 30: ...ngs can be assigned to each ID Code and the Numeric Display mode can be modified In addition the display mode for the desired ID code can be changed to a PER CENT reading or the display can be turned off ID STRING 1 Enter up to 20 Char s NORMAL PER CENT DISABLED NUM DISP MENU ID CODE SETUP MENU ID NAME MENU INPUT ID NAME NUM DISP ID NAME STRING 2 ENTER ENTER ENTER Usually F1 ID STRING 2 Enter up t...

Page 31: ...s When finished editing push the ENTER key twice See General Alpha Numeric Character Entry Procedure 5 The display reads ID NAME Press EXIT to return to normal weighing mode or press UP or DOWN to reach the next selection EXIT SETUP SETUP F1 ID ID NUMBR ENTER ID NAME ENTER Current ID Name appears F4 F5 to select char UV F3 EXIT F2 to scroll char ALPHA A a 1 1 ABC to input char ENTER ENTER to final...

Page 32: ...display modes by using the UP DOWN keys to scroll through the choices In this example we ll pick the PER CENT mode 6 Push ENTER to set the Number Display mode 7 You are back in the SETUP ID menu Return to normal scale operation in PER CENT by pushing EXIT EXIT SETUP SETUP F1 ID ID NUMBR ENTER ID NAME UV F3 NUM DISP ENTER NORMAL UV F3 PER CENT ENTER NUM DISP EXIT SETUP NUM DISP The function of the ...

Page 33: ...rsatile output capability See Section 7 Comm Ports for more details on programming codes Use the ID Code Strings to set up a print string that changes with every ID code Combined with the standard Comm Port print strings the Code Labels can be used to design a very sophisticated bar code label with three fields that change with every ID Code the ID Code Name and ID String 1 and 2 The entry procedu...

Page 34: ... A a 1 1 ABC to input char ENTER ENTER to finalize edit To Access the ID Code Strings with the FUNCTION keys For this procedure to function a FUNCTION key must be programmed for STRING 1 and or STRING 2 The key s used for this purpose can be labeled to suit your needs e g CUSTOMER or OPERATOR etc See Section 2 Function Keys for details 1 Push the FUNCTION key once to access a STRING The current st...

Page 35: ...ied weight must be greater than the Total Threshold before it can be totaled See SETUP TOTAL for instructions on how to set the Total Threshold To Total with the TOTAL Key Unit must be setup to Manual Total mode Rules for use 1 The motion annunciator must be off the scale must be stable unless motion is disabled in the Setup Total menu 2 Only positive readings can be accumulated 3 The scale adds t...

Page 36: ... last settled reading Auto Total Operation 1 Enable the Auto Total mode in the SETUP TOTAL menu see SETUP TOTAL Select either the AUTONORM or the AUTOPEAK mode Exit from the setup menu 2 Use the TOTAL key to disable TOTALOFF or enable TOTAL ON Auto Total 3 Place the weight to be totaled on the scale The Total LED will flash three or more times when the weight is settled In high speed operations it...

Page 37: ... of AUTOTOTAL must be approved per application by the sealing official MOTION Enables or disables Motion Detection for Manual Total Has no effect on AUTOTOTAL This menu item controls whether the scale has to be out of motion before it will total In certain high vibration applications it is sometimes desirable to turn off the motion detect so that Totalization can occur This feature is disabled for...

Page 38: ... switch usually F3 2 Push ENTER The first menu choice is MANUAL or the last set mode In this example we ll enable the AUTONORM mode 3 Push the UP or DOWN key to scroll through the Total Mode options Shown here are all the Total Mode Options to illustrate how the menu structure works It is not necessary to go through all options 4 When the desired choice is displayed push ENTER The ENTER key should...

Page 39: ...tor will appear UV F3 TOTAL N AUTO 1 Push SETUP followed immediately by the TOTAL switch usually F3 2 Push the UP Scroll key until the menu choice is THRESH 3 Push ENTER The Threshold Screen will appear The currently set threshold is displayed on the Weight Display 4 Use the numeric keys to input the desired Total Threshold Remember that the threshold is based on per cent of Scale capacity In this...

Page 40: ...Display the Current ID s Totaled Weight 1 Push SETUP followed immediately by the TOTAL switch usually F3 2 Push the UP Scroll key until the menu choice is MOTION 3 Push ENTER 4 Change the state of Total Motion detect with the UP key 5 When the desired mode is displayed push ENTER Note Total Motion has no effect on AUTO TOTAL It is for use with MANUAL TOTAL only 6 Push the EXIT key to return to nor...

Page 41: ...mber of weighments counter is reduced by one If you change your mind push EXIT to cancel the Clear Last Total operation VIEW TOTAL F4 ZERO 0 ENTER To Clear the Total Value Current ID Code only Note At any time during the following procedure the EXIT key cancels the Clear operation 1 Push VIEW TOTAL usually F4 then CLR ZERO The message reads x TOTAL where x is the number of totaled weighments then ...

Page 42: ...W TOTAL F4 SETUP ENTER SETUP ENTER STATISTICS OPTION The Statistics option works in conjunction with the Total function and adds MIN MAX Average Standard Deviation and Coefficient of Variance All these computations are kept for every ID Code independently The number of samples that statistics can be calculated for is limited only by memory require ments and will vary from a few thousand to 100000 ...

Page 43: ... samples n x x n n 2 2 1 COEFFICIENT OF VARIANCE is a relative dispersion calculated from the sample standard deviation and the mean with the following formula 100 StdDev Average GRAND TOTAL is computed by adding together the totals of all the ID Codes adjusted to the default unit set in calibration if necessary GRAND AVERAGE is computed by dividing the Grand Total by the number of samples of all ...

Page 44: ...weight has been totaled in the current ID Code 2 Push STATS F2 again The second statistic is the Minimum Weight 3 Push STATS F2 The third statistic is the Maximum Weight 4 Push STATS F2 The fourth statistic is the Standard Deviation 5 Push STATS F2 again The fifth statistic is the Coefficient of Variance 6 Push EXIT to return to normal scale operation EXIT F2 STATISTICS EXIT F2 STATISTICS EXIT F2 ...

Page 45: ...rand Total and Average for all ID Codes The following example assumes F5 was programmed to be GRNDTOTL 1 Push GRAND TOTAL usually F5 The first statistic displayed is the Grand Total obtained by adding the totals of all product codes Note The GRAND TOTAL key will not function until weight has been totaled in at least 1 ID Code 2 With a suitable printer or computer attached to the COMM Port1 push PR...

Page 46: ...ids any change in the active menu NOTE Not all the selections above are activated on every MSI 3750 Legal for trade issues and application issues require certain menu items to be under the Calibrate menu under seal see calibration section and certain items to be disabled Any or all menu items can be eliminated under software control contact factory for details ASSGN F5 ASSGN F4 ASSGN F3 ASSGN F2 A...

Page 47: ...ing has settled Motion indicator off Not available in some legal for trade systems or the FILTER menu is moved to the Calibrate Setup Menu To Change the Filter Setting EXIT SETUP SETUP 2s delay SETUP UV F3 SETUP ENTER SETUP UV F3 SETUP ENTER SETUP EXIT SETUP 1 Push SETUP Wait 2 seconds or push SETUP again The message reads KEY FCTN 2 Push the UP scroll key to change the menu selection to FILTER 3 ...

Page 48: ...he display is too dim use a higher setting such as 5 8 To Adjust the LCD Contrast EXIT SETUP SETUP 2s delay SETUP UV F3 UV F3 SETUP ENTER SETUP EXIT F2 SETUP EXIT F2 SETUP ENTER SETUP EXIT SETUP 1 Push SETUP Wait 2 seconds or push SETUP again The message reads KEY FCTN 2 Push the UP scroll key until the menu selection is CONTRAST 3 Push ENTER 4 Adjust the contrast by pushing the UP or DOWN key Pus...

Page 49: ...3 UV F3 SETUP ENTER SETUP ENTER HOURMIN 2 DEF 0 SPACE 3 GHI 0 SPACE ENTER 1 Push SETUP Wait 2 seconds or push SETUP again The message reads KEY FCTN 2 Push the UP scroll key until the menu selection is TIMEDATE 3 Push ENTER The menu reads SET 4 Push ENTER again The message reads HOURMIN The current set time is displayed 5 Input the hours and minutes in 24 hour mode with the numeric keys The second...

Page 50: ... every minute or every second depending on the mode selected The processor will also check for activity on the Comm Ports to see if a Power up command is received Therefore to achieve no worse than a 1 second turn on set the mode to the 12HR SEC or the 24HR SEC selection The mode has no effect on the power switch Note Operating the Clock from a battery powered MSI 3750 has very little effect on ba...

Page 51: ...V F3 LIGHTING ENTER OFF UV F3 ON ENTER LIGHTING EXIT SETUP 1 Push SETUP followed immediately by the POWER key 2 Push the UP key to select the menu item LIGHTING 3 Push ENTER The current Backlight mode is shown 4 Push the UP key until the message reads ON 5 Push ENTER The backlight will turn on 6 Push EXIT SETUP to return to normal scale operation or use the UP DOWN and ENTER keys to change another...

Page 52: ... point if pour down or similar applications dictate BARMODE The BARMODE menu has three settings 1 LEVEL Used only on the Magnum Lift Truck Scale Indicates how level the vehicle is and if the level is within range for accurate weight readings 2 PER CENT The Bargraph represents a user programmed span of the weight reading The 100 and 0 settings are programmable anywhere within the capacity of the sc...

Page 53: ...argraph Mode defaults to MODEM 3 Push the UP key until the message reads PER CENT How many times you push the UP key is dependent on the last mode set 4 Push ENTER 5 Next using the DOWN key scroll to the BAR 0 menu 6 Push ENTER The message display indicates WEIGHT and the numeric display shows the current 0 value defaults to 0 7 Using the numeric keys enter the value that you want to equal 0 on th...

Page 54: ... function is tried To unlock push SETUP NET GROSS and enter the lock code number The LOCKMODE menu determines which functions features are locked For example locking the SETUP key would prevent any setup functions from being used except of course the LOCK function SETUP NETGROSS There is no need to lock out functions that are only available on the Fx keys if no key is assigned to that function e g...

Page 55: ...rs The numeric display indicates if the item is locked Loc or unlocked UnLoc 4 Use the UP or DOWN keys to scroll through the list Use the LEFT or RIGHT cursor keys to toggle between locked and Selecting Which Features to Lock Note You must set at least one item to Loc for the Lock Code to function LOCKMODE MENU GRNDTOTL CLRLATCH ZERO VIEW UNITS TOTAL TEST TARE STRING 2 STRING 1 STATS SETUP SETPOIN...

Page 56: ...again to return to normal scale operation EXIT F2 F5 EXIT SETUP EXIT SETUP SETUP INSERT B G NET GROSS LOCKCODE ENTER ENTRCODE 1 ABC 1_ 1 ABC 11_ 1 ABC 111_ ENTER LOCKED EXIT SETUP 1 Push SETUP followed immediately by the NET GROSS switch The message display reads LOCKCODE 2 Push ENTER The message reads ENTRCODE 3 Push ENTER if no security code is needed If a custom lock code is desired enter up to...

Page 57: ...eric keys the example lock code is 111 when finished push ENTER Note If the lock code was empty just push ENTER and the scale will unlock EXIT SETUP SETUP INSERT B G NET GROSS LOCKCODE INPUT LOCK CODE ENTER WARNING If the lock code is lost the calibration seal must be broken to reset and unlock the 3750 Follow the RESET ALL procedure then perform a complete calibration MSI Service personnel can pr...

Page 58: ...50s each set point can be assigned to a single input A or B the combination A or B or the sum of the inputs A B designated as A Ad b SETUP SET POINTS MENU DISABLED GRADING NORMAL ALL SET POINTS MODE MENU SET PT 1 SET PT 2 SET PT 3 SET PT 4 SET PT 5 SET PT 6 SET PT 7 SET PT 8 OFF SET POINTS TEST MENU VALUE DELAY MESSAGE DISPLAY WGT MODE LATCH SET POINTS PROGRAM MENU TOTAL NETGROSS GROSS INPUT UP to...

Page 59: ...key to select the desired set point mode NORMAL DISABLED or GRADING In this example we will enable the set points as NORMAL 4 Push ENTER to store your selection You are now back in the SETUP SET POINTS menu Use the UP DOWN keys to select the next set point menu or push EXIT to return to normal scale operation Setup Set Points Menu Entry Procedure SP MODE The SP MODE All Set Points Mode menu select...

Page 60: ...comparisons is to use the GRADING mode however all the set points become interactive Each set point has five sub menus WGT MODE VALUE DISPLAY LATCH and MESSAGE SET PT1 through SET PT8 MAIN MENU LEVEL On the main SETUP SET POINTS MENU level each set point can be enabled on or off by using the scroll keys Turning the set point off does not change any parameters set in the set point Program menus Dua...

Page 61: ...age to display on the LCD and or to transmit out either COMM Port You can embed MSI Codes in the set point message that can cause the weight time date etc to print out the selected Comm Port Messages displayed on the LCD are prioritized by the SP number Set point 8 s message will take priority over SP1 7 Set point 7 s message will take priority over SP1 6 and so on The most important message shoul...

Page 62: ...ENTER 6 For a set point that will switch on when the weight is greater than or equal to the value motor or solenoid This can be prevented by using a dead zone to cause the set point to have one value for turning on and a different value for turning off For example A set point set to 500 lb with a dead zone of 10 lb will turn on at 500 lb It will not turn off until the weight goes below 490 lb 500 ...

Page 63: ... Set point Values are limited to Capacity 5 unless the WGT MODE is TOTAL Dual Input 3750s are limited to the sum of the capacity of Input A plus the capacity of Input B 5 9 Push ENTER to store your set point value 10 You are now in the DEAD ZONE VALUE MENU This step is optional Skip to step 11 if a Dead Zone value is not needed Dead Zone value of 0 Use the numeric keys to input the weight range de...

Page 64: ...the UP key to the MESSAGE menu 17 Push ENTER The message entry screen will appear 18 Use the ALPHA 1 9 and ENTER keys to input a message up to 20 characters You can include codes for printing current weight time and date with the set point message See the Comm Port Section 7 for details on entering the message Refer to section 7 for text entry procedures 19 After the text entry you can assign the ...

Page 65: ... weight regardless of any Tare value The first menu choice will be the last set mode In this case the set point was in the NETGROSS mode 27 Use the UP or DOWN key to scroll through the menu choices 28 When the desired choice appears push ENTER to store your selection You are now back in the SET POINTS PRO GRAM MENU See MODE MENU above for a description of each menu choice 29 This step is optional ...

Page 66: ... set point 1 8 you wish to enable or disable In this example we ll enable set point 2 but the procedure applies for any set point 4 Use the LEFT or RIGHT cursor key to enable the set point Dual Input 3750s Use the LEFT or RIGHT Cursor keys to select A B A or B A Ad b Summed A B 5 Push EXIT to return to normal scale operation or use the UP or DOWN keys to scroll to other set points ENABLING DISABLI...

Page 67: ...s to proceed See procedure above To re enable all the Set Points Follow steps 1 5 above except on step 4 select the NORMAL or GRADING mode This does not override the settings of each set point You must enable them individually if they were in the OFF condition USING THE MSI 3750 AS A GRADING SCALE The MSI 3750 with or without the Set points relay option can be set up as a multiple zone up to 8 gra...

Page 68: ...nts to the following settings Set point 1 On MODE GROSS MESSAGE 10 VALUE 10 Set the DEAD ZONE to 0 on this and all subsequent set points Set point 2 On MODE GROSS MESSAGE 10 10 5 VALUE 10 Set point 3 On MODE GROSS MESSAGE 10 5 11 VALUE 10 5 Set point 4 On MODE GROSS MESSAGE 11 11 5 VALUE 11 Set point 5 On MODE GROSS MESSAGE 11 5 12 VALUE 11 5 Set point 6 On MODE GROSS MESSAGE 12 12 5 VALUE 12 Set ...

Page 69: ...load 25 CMOS loads RELAY CABLING The Relay connections are made into terminal blocks found on the circuit board internal to the MSI 3750 Due to wash down requirements use round cable that has an outside diameter of 187 to 312 5mm to 8mm for proper sealing with the watertight fittings The terminal blocks are suitable for wires from 16 to 24 gauge There are up to three watertight fittings dedicated ...

Page 70: ... relays to change speeds on a motor See Figure 1 for an example hook up to a lamp The normally open NO contact of a relay is used to turn devices on when a set point is reached while the normally closed NC contact is used to turn a device off when the set point is reached The common COM contact connects the power to the relay Neutral Hot Turn on a Lamp when the Setpoint is reached NO CM NC 1A SMD ...

Page 71: ... outputs are combined to cut off a motor when the weight is outside two limits In Figure 5 two relays are combined to turn on a motor when the weight is outside two limits NO CM NC 1A SMD FUSE Relay NO CM NC 1A SMD FUSE Relay Cut off a motor when the weight is out of limits Motor is off when the weight is 5 5lbs or 4 5lbs SP1 Set for 4 5lb SP2 Set for 5 5lb SP1 SP2 DC MOTOR Figure 4 NO CM NC 1A SM...

Page 72: ... in reality 4000B series CMOS devices it may be necessary to provide an external pull up resistor in certain cases Values of 1kΩ to 4 7kΩ usually will suffice There are two complementary outputs as shown in Figure 7 The TTL Hi output goes high when the set point is tripped The TTL Low output goes low when the output is tripped The logic output ground must be connected to provide a reference level ...

Page 73: ...the relays push EXIT twice to return to normal scale operation Driving External Relays with Setpoint 8 External Relay 24V Typ 24V Return 10kΩ Resistor Logic Level N Chan Power MOSFET D G S TTL LO GND TTL HI Setpoint 8 Isolated Ground Isolated 5V WARNING This procedure will turn on and off any device connected to the relays Make sure that doing so will not cause a safety hazard or damage prop erty ...

Page 74: ...n Comm Port1 For example a printer could connect to Comm Port1 and a scoreboard or computer to Comm Port2 Many scales and weigh meters suspend weighing operation while printing and will not function until a print job is completed The MSI 3750 RS 232 option uses advanced DMA direct memory access techniques for transmit ting the print strings This prevents long print jobs from interfering with scale...

Page 75: ... compatible with RS 422 Receivers 3 Fiber Optic Output Option The Fiber Optic Output provides an output capable of driving 3000 feet of plastic fiber optic cable This is an output only and intended for driving printers or transmitting data to a computer when no computer control or handshaking is necessary COMM PORT CABLING The Comm Port 1 RS 232 connections are made into TB3 found on the circuit b...

Page 76: ...4 5 6 SHLD TXD RXD RTS CTS SGND RS 232 Cable Installation Comm Port2 1 Unplug the power cable Remove the 10 screws holding the front panel on 2 Strip the outer insulation 1 5 40 mm from the cable Peel back the foil shield if any being careful not to nick the conductors Cut off the foil shield and the drain wire Strip 3 16 5 mm from each conductor and tin the wires It is wise to shrink a short piec...

Page 77: ...nd remove the white plug Feed the RS 485 cable through the center watertight feedthrough If the center watertight feedthrough is occupied install the 2nd Comm Port cable through the watertight feedthrough on the rear panel 4 Insert the wires as shown in the following diagram Insert a small flat bladed screwdriver in the white lever and push down to insert the wire Connect wire 1A to I O and wire 2...

Page 78: ...the data output The 3750 offers the programmer the ability to print any and all weight data time and date stamp and formatting controls suitable for even the most complex bar code printer Data Format Each transmitted reading consists of a number of programmable character strings Data is completely user programmable and can include formatting characters and text in addition to all weight parameters...

Page 79: ...allowed or disallowed when the weight is in motion and or not stable 7 Print On Change Every time the weight changes 1 full display count or more one transmis sion of data will occur The MOTN DET menu determines if printing is allowed or disallowed when the weight is in motion and or not stable Interval has no effect in this mode 8 Print on Load Change When the load weight exceeds the Total Thresh...

Page 80: ...ta Formatting COMM PORT 1 This menu choice leads to the COMM PORT PARAMETERS Menu for all parameters related to COMM PORT 1 COMM PORT 2 This menu choice leads to the COMM PORT PARAMETERS Menu for all parameters related to COMM PORT 2 SCALE ID This menu designates an ID number that is required for multiple scale setups usually networked with RS 485 The user can assign a unique number per scale from...

Page 81: ...00 9600 19 200 ENABLED DISABLED DUPLEX OFF TALK LISTEN PRINTKEY CONTIN ON CTS ON SP1 ON SP2 SP1 SP2 ON TOTAL ON CHANG ON LOAD DATA STRTLINE END LINE WAIT CHR Enter Up to 255 Characters Enter Up to 4 Characters Enter 1 Character BAUDRATE STOPBITS DATABITS PARITY HANDSHAK ONCE ON INPUT INTERVAL 0 28800s 1 BIT 2 BIT 7 BIT 8 BIT BAUD RATE RTS CTS XON XOFF NONE DATA ENTRY STRING SELECT OUTPUT CONTROL C...

Page 82: ...the Comm Port mode must be Duplex Once the proper Wait Character has been received the 3750 will output the next data string up to the next EOL string MODE The MODE menu sets the communications mode for the port Use TALK for outputting data to a printer that uses hardware handshaking or no handshaking Use DUPLEX for printers with software handshaking XON XOFF etc or to talk and listen to a compute...

Page 83: ...r control modes can be useful for control and monitoring purposes SETTINGS The Settings menu is used to set standard Comm Port parameters BAUDRATE Standard Baud Rates available are 300 600 1200 2400 4800 9600 19200 The 3750 defaults to 9600 Baud See To Set The Baud Rate STOP BITS Either 1 or 2 Stop Bits can be set The 3750 Stop Bits default to 1 DATA BITS Either 7 or 8 Data Bits can be set If 7 bi...

Page 84: ...ush ENTER The current Baud Rate is displayed 6 Use the UP or DOWN key to scroll through the available Baud Rates 7 When the desired rate is shown push ENTER You are now back in the SET TINGS Menu In this example we ll change the Baud Rate to 19 200 8 Either use the UP DOWN scroll keys to select another SETTINGS menu or push the EXIT key three times to return to normal scale operation Each push of ...

Page 85: ...odern bar code printers is simply a matter of formatting the printer strings The MSI 3750 character set includes all upper case letters lower case letters numbers and most of the rest of the standard ASCII set General Alpha numeric Entry Procedure 1 Use the Aa1 ALPHA key to switch between numeric n upper case U or lower case L 2 Press the desired character key If a B is needed push the ABC key twi...

Page 86: ...ge 86 MSI 3750 Digital Weight Indicator User Guide the desired character number is displayed push ENTER See Programming the End of Line String for an example of using the ASCII entry mode SETUP POSITION OF CURSOR CHARACTER DECIMAL ASCII CODE PRINT STRING ASCII NULLS ...

Page 87: ... Use the ASCII chart and the numeric display to verify the identity of the mark The Alpha Key is used to change the data entry from Numeric to Alpha numeric The LCD indicates n for numeric entry U for upper case Alpha numeric and L for lower case Alpha numeric Alpha numeric Keys When the Alpha key is in the n condition these keys provide direct numeric digits When the Alpha key is in the U conditi...

Page 88: ...used for example only The necessary string will be The 27 is an ESC followed by a 4 which equals Red Character Print instruction The 14 is an SO which turns on the Expanded character instruction The 20 is an DC4 which turns off the Expanded character instruction π The 27 is an ESC followed by a 5 which turns off the Red Character Print instruction E causes the end of line string to be sent W3 caus...

Page 89: ...e find the an ESC is decimal 27 We will use the ASCII entry mode to place a 27 in the string Push ASCII TARE The LCD message changes to ASCII The numeric digits indicate the decimal number of the ASCII character 6 Push the 2 key then the 7 key Push ENTER The resultant string so far should look like this The Í character takes the place of the 27 we just entered This can be verified by backspacing 1...

Page 90: ...ion push the 5 key four times or push the ALPHA key to change to the numeric mode 12 Enter the E to embed the end of line string in the Data String 13 Enter the W3 to place the Net Weight reading in the Data string The resultant string so far should look like this Í4ÍPEARSÍÍ5 E W3 Note Only 8 characters are viewable at a time Use the Left Right Scroll Keys to move the string window for checking pu...

Page 91: ...eturn to normal scale operation or use the UP DOWN keys to continue through the COMMPORT setup menus 14 a ALPHA A a 1 9 YZ 14 b 2 DEF D 14 c ALPHA A a 1 ALPHA A a 1 2 DEF 2 15 a ALPHA A a 1 9 YZ 15 a 2 DEF 2 DEF E 16 ENTER ENTER EXIT SETUP 1 Push SETUP followed immediately by the PRINT key The message reads COM PORT1 2 Push ENTER The message reads FOR MAT The END LINE entry screen is in the FORMAT...

Page 92: ...the 255 character into a CR by pushing 1 then 3 then ENTER The EOL screen reappears with the cursor on the next character the LF that was present before The EOL string now consists of two characters other than the place holders You can use the cursor keys to verify that character 1 is a 13 Carriage Return and that character 2 is a 10 Line Feed 9 Push ENTER twice to return to the Format Menu 10 Use...

Page 93: ...Position the cursor blinking character over the character you wish to delete Push CLR The remaining characters move over 1 space Push ENTER twice to store the edited string Note Pushing the EXIT key will exit out of the menu and restore the string as it was The changes must be saved with the double ENTER key push or by pushing the POWER key To disable the Entire Print String Position the cursor bl...

Page 94: ...hics characters on printers Commands are case sensitive only capital letters are used Input Data Form With the exception of characters following the command symbol all characters are treated as printable text or control characters The MSI 3750 represents characters that can t be displayed on the LCD with a å Terminate the string with a dec255 character ASCII 255 ASCll 255 characters are represente...

Page 95: ...s the number of spaces desired Note Exactly two digits must follow the B command Output Data Form x spaces are output limited to 99 For more spaces use two B commands in series Note For spaces fewer than 5 it is more efficient to enter spaces instead of the B command Example Building on the previous example we ll center the MSI 3750 on a 20 column printer B06å4åMSI3750åå5º The B06 command printed ...

Page 96: ...r Input Data Form D1 Full alpha date in the form DDMMMYY with the month spelled out D2 Print date in the form MM DD YY D3 Print date in the form DD MM YY European Standard D4 Print the day of the week D5 Full alpha date in the form DDMMMYYYY with month spelled out D6 Print date in the form MM DD YYYY D7 Print date in the form DD MM YYYY European Standard Output Data Form D1 2 5 J U L 0 0 Length 8 ...

Page 97: ...ommands See Format H PRINT HORIZONTAL TABS Purpose Use the H command to send a series of Tabs Can be used to position data on a label without having to enter multiple spaces Not all printers support tabs Check with printer manual for proper application of tabs in printer formatting Input Data Form Hxx where xx is any number from 01 to 99 which equals the number of tabs desired Note you must enter ...

Page 98: ...ormat or text to change with the ID Code Input Data Form L1 Print ID Code String 1 L2 Print ID Code String 2 Output Data Form Depends on user entered Strings Up to 20 bytes unless codes are embedded which could increase the length of data generated by this command Caution Do not embed an L command inside the ID String as this will cause an endless loop M PRINT WEIGHING MODE Purpose Use the M comma...

Page 99: ...d mode see M2 M3 M4 M8 M2 G R O S S Length 6 Justification left M3 N E T Length 6 Justification left M4 T A R E Length 6 Justification left M5 T O T A L Length 6 Justification left M6 T C N T Length 6 Justification left M7 T O T A L T C N T Length 12 Justification left M9 IfGrossweightisadded G R O S S Length 6 Justification left M9 IfNetweightisadded N E T Length 6 Justification left M9 IfRegiste...

Page 100: ...ut the Start of Line string The SOL string is preprogrammed in the COMM PORT Setup Menus Input Data Form S Print SOL String Output Data Form Sends out the SOL string a maximum of 4 bytes T PRINT TIME Purpose Use the T command to print the current time register from the real time Clock Input Data Form T1 12 hour format with HH MM T2 12 hour format with HH MM SS T3 24 hour format with HH MM T4 24 ho...

Page 101: ... T O N T N E T R O Z Length 4 Units available depend on capacity and legal for trade setups V PRINT WEIGHT Purpose Use the V command to print the current weight without units or mode printed Note V is not available on LFT configured 3750s Input Data Form V1 Displayed weight GROSS NET DEV DEV V2 Gross weight V3 Net weight Note will print dashes if NET mode is not enabled V4 Tare weight Note will pr...

Page 102: ...mber field right leading zeros suppressed V8 Not functional on 3750 V9 2 0 5 0 2 Length 8 Justification full leading zeros suppressed W PRINT WEIGHT FULLY Purpose Use the W command to print the current weight with units and mode printed Input Data Form W1 Displayed weight W2 Gross weight W3 Net weight Note will print dashes if NET mode is not enabled W4 Tare weight Note will print dashes if no Tar...

Page 103: ...R O S S If net weight is added W9 2 0 0 1 5 K G N E T If total register is empty W9 K G A D 2 T O T Length 20 Justification Weight right Units left Mode left the indicates that it is the weight from the last totaled register 9 6 1 2 3 4 5 7 8 10 11 12 13 14 15 16 LAST WEIGHT ADDED TO TOTAL UNITS 17 18 19 20 MODE 9 6 1 2 3 4 5 7 8 10 11 12 13 14 15 16 LAST WEIGHT ADDED TO TOTAL UNITS 17 18 19 20 MO...

Page 104: ...4 Standard Deviation X5 Coefficient of Variance X6 Grand Total X7 Grand Total Average X8 Grand Total Number of Samples Output Data Form X1 X2 X3 X4 X5 X7 2 0 5 0 2 Length 8 Justification right justified X6 1 2 3 4 5 6 7 0 5 Length 10 Justification right leading zeros suppressed W8 1 2 3 4 5 6 7 8 Length 10 Justification right leading zeros suppressed Y PRINT STATISTICS FULLY requires Statistics Op...

Page 105: ...NT OF VARIANCE 17 18 19 20 COEFFICIENT OF VARIANCE Output Data Form Y1 1 3 3 5 5 K G A V G Length 20 Justification Weight right Units left Mode left Y2 3 2 1 0 K G M I N Length 20 Justification Weight right Units left Mode left Y3 2 0 0 1 5 K G M A X Length 20 Justification Weight right Units left Mode left Y4 2 0 0 1 5 K G S T D D E V Length 20 Justification Weight right Units left Mode left Y5 3...

Page 106: ...FROM SCALES A B These commands are unique to the Dual Load Cell ABC Meter Purpose Use the 1 2 3 and 4 commands in conjunction with the Vx or Wx commands to cause the print string to take data from one of the four weight modes When preceded by the 1 4 command do not use the sign in front of the weight command e g 1W3 If the W or V commands are used without the 1 4 in front the scale mode currently ...

Page 107: ...nds are terminated by another command or by a semicolon It is necessary to end a multiple com mand string with the semicolon as a terminator Variable length numeric data must be terminated by a semicolon or by another command Variable length alphanumeric data must be terminated by a semicolon before adding additional commands Commands are case sensitive only capital letters are used The 3750 will ...

Page 108: ...option 1 Automatic 2 On 3 Off BL Comm Port Data Send CD followed by all commands text Must be ended with a semicolon Up to 480 characters CD Enable Comm Port for receiving control formatting All and C commands will be directed to the last enabled port 1 Comm Port 1 2 Comm Port 2 CE Total Mode 1 Disabled 2 Manual 3 Not used 4 Auto Norm 5 Auto Peak EM Filter 1 Low Filter 2 Med Filter 3 High Filter F...

Page 109: ...2 Enabled KE Keyboard Function Emulate Terminate Value with any com mand or a 1 Power 2 Zero 3 Gross 4 Net 5 Tare 6 Total 7 View Total 8 Clear Last Total 9 Clear Total 10 Clear all Totals 11 Print 12 Peak Hold On 13 Peak Hold Off KF Description Comments Suffix Bold text indicates default Command Listen to cause only the selected scale to listen 0 Listen Always all scales 1 255 Scale ID LI Lock Val...

Page 110: ...IN SEC RM Real Time Clock Set Example RT22 35 55 is equal to 10 35 55 PM Enter time in HH MM SS RT Day of Week Set 1 Sunday 2 Monday 3 Tuesday 4 Wednesday 5 Thursday 6 Friday 7 Saturday RW Set Point Receive Data Enable S 1 to S 8 enables each set point The last enabled set point receives any set point data or parameters 1 8 for Set Points 1 through 8 S Set Point Dead Zone Value Terminate weight va...

Page 111: ...arac ters SS Set Units Terminate Value with any com mand or a 1 lb 2 kg 3 tons 4 metric tons tne 5 oz 6 g 7 daN 8 lb oz UN Description Comments Suffix Bold text indicates default Command Set Point Delay End with Input of seconds delay 0 1500 seconds ST Set Point Value Terminate weight value with a semicolon or another command or followed by Weight in current units SV Tare Terminate string with sem...

Page 112: ...e standard with the LEGAL STANDARD procedure If the unit is to be used with metric units only set the standard to METRIC 3 Follow the INITIAL CALIBRATION procedure to set calibration units capacity d and gain 4 Reseal the Cal port when finished For a simple calibration 1 First follow the Enable Calibration procedure below 2 Next follow the procedure in the STANDARD CALIBRATION section 3 Reseal the...

Page 113: ... Exit out of the Calibration Menus Select the other scale with the ScaleID Key Then enable Calibration again 2 Insert a small non metallic screwdriver or the wooden stem of a Q Tip and press the switch button in the hole The display reads CALSETUP for 2 seconds Tip A wooden Golf Tee fits the hole perfectly Dual Input ABC units will also display the message LOAD EE for 2 seconds 3 The first item in...

Page 114: ... required by various regulatory agencies The INDUSTRY selection is the default Choose NIST for US and Canadian Legal for Trade units Choose OIML for European LFT applications METRIC is the same as INDUSTRY except only kg and g units are enabled Note Dual Load Cell Systems Only The STANDARD menu is not available on Dual Load Cell ABC Systems The standard is fixed at Industrial Note Before starting ...

Page 115: ...ck the METRIC stan dard This will limit the units choices to kg and g and Metric Tons if the capacity is high enough 4 Push ENTER to set your selection 5 You are now back in the CAL SETUP menu Use the UP DOWN keys to scroll to the next calibration operation or push EXIT to return to normal scale operation UV F3 UV F3 STANDARD ENTER INDUSTRY UV F3 NIST UV F3 OIML UV F3 METRIC ENTER STANDARD UV F3 o...

Page 116: ...able push ZERO or ENTER The display reads CAL ING Wait for about 5 seconds If the detected zero weight is within accept able limits the message WEIGHT will appear 5 Span Calibration The 3750 can be calibrated with any in span test weight from 20 to 100 of capacity Place the calibra tion weight on the load receptor MSI suggests that an ideal test weight is equal to capacity but any weight 20 of cap...

Page 117: ...n factor needed 7 Once the weight on the load receptor is stable push ENTER The message CAL ING appears The 3750 checks to see if the weight data is within acceptable limits 8 If the Span parameters were OK the message will read CAL OK then STOR ING Calibration is complete push EXIT to return to normal scale operation or push UP DOWN to choose another Calibrate Setup function Seal the calibration ...

Page 118: ...hat the calibration weight is 20 of capacity or more 2 Verify the cal weight is entered correctly 3 Go to the INIT CAL procedure and change the gain UNDERRNG A D converter underrange In the calibrate menus an under range indication means that the A D is out of zero range This can be caused by a load cell with too much negative offset 1 Add dead load or use the coarse zero DIP switch to bring the z...

Page 119: ...Displayed when either a test weight value entered exceeds capacity or when the scale will not have enough A D counts to measure full capacity plus 10 divisions 1 Verify the test weight value was entered properly 2 Reduce the gain INIT CAL XS LOAD Insufficient A D resolu tion for requested display resolution After calibration the scale determines if the number of counts between zero weight and full...

Page 120: ...t Points all Print Strings and resets all the registers back to factory defaults DO NOT initiate this function unless you are prepared and qualified to perform a complete initialization and Calibration procedure CAUTION RESET CALIBRATION Completely clears the internal EEROM of calibration settings including capacity and count by d Does not erase other user functions such as ID Codes or RS 232 sett...

Page 121: ...ousing 2 Insert a small non metallic screwdriver or the stem side of a wooden Q Tip and press the switch button in the hole While holding in the cal Switch trun on the 3750 The display reads RESETALL followed by R U SURE 3 To complete RESETALL push ENTER To cancel this operation leaving the previous calibration and setup registers intact push EXIT 4 The system will now be in the UNCAL ED state Pus...

Page 122: ...pter PWR BATT if the scale is equipped with the 2 D cell option 4 Push ENTER when the proper choice is displayed In this example the 3750 is a standard AC unit Scales equipped with the special option for 12V batteries or AC should use the PWR AC setting 5 Next set the default units the scale is calibrated in The capacity initially pro grammed in the calibration units determines the overload value ...

Page 123: ... example we ll change the scale divisions to 0 1 kg NOTE MSI does not recommend increasing the resolution beyond 12500 counts You can determine resolution by dividing the capacity by the count by For example a 250 kg capacity scale with a count by of 0 02 kg would have 12500 counts 250 02 Going beyond 12500 counts can cause noisy readings Most Strain Gage based Load Cells Scale Systems are best su...

Page 124: ...e too high and should be corrected with Coarse Zero 15 Span Calibration The 3750 can be calibrated with any in span test weight from 20 to 100 of capacity Place the calibra tion weight on the load receptor MSI suggests that an ideal test weight is equal to capacity but any weight 20 of capacity will suffice The bargraph again indicates relative A D counts With full scale span input the bargraph sh...

Page 125: ...out variations at zero caused by debris or water on the scale temperature drift and any other minor variation that affects the zero setting Typically AZM is set to 0 5d or 1d which is adequate for most modern scale systems The 3750 allows for a much greater AZM range non legal for trade scales only for unique applications Use this feature cautiously as it can zero out large quantities automaticall...

Page 126: ...r 1kg as the AZM range Note The AZM range is limited to a maximum of 255 d If you exceed this range the 3750 will return the error message TOO BIG 6 After keying in the desired AZM range push ENTER 7 Push EXIT to return to normal scale operation or push UP or DOWN to choose another Calibrate Setup function UV F3 UV F3 AZM ENTER DISABLED UV F3 ENABLED ENTER SETUP 1 ABC 1_ ENTER EXIT SETUP Disabling...

Page 127: ...NTER EXIT SETUP Note In Legal for Trade systems the Motion Band can not be adjusted TO ADJUST THE MOTION BAND The motion band determines the range of weight variation that the indicator considers to be stable weight Since the 3750 will not zero or tare a value in motion the motion band directly influences the accuracy of the scale system The motion band in Legal For Trade systems is fixed at 0 6d ...

Page 128: ...e The use of Coarse Zero is usually not necessary This procedure should not be used routinely This is intended only for hard to calibrate situations where dead load or severe zero shift has occurred Check the scale for damage or misadjusted stops before assuming Coarse Zero will help you LOAD CELL INPUT TB1 1 Excitation Red Signal Green Signal White Excitation Black Shield Drain Wire Sense Optiona...

Page 129: ...come and the bargraph at zero load shows a reading from 10 to 60 proceed at step 8 of the Init Cal Procedure RAW COUNTS The 3750 uses a 20 bit A D converter to measure and convert the output from load cells It is sometimes useful see the Raw Counts of the A D to ensure system functionality A very useful application of Raw Counts is in balancing multiple load cells with summing boxes Raw counts are...

Page 130: ... procedure to set the 3750 into Raw Counts 2 Turn all the pots of the summing box fully clockwise to maximize the load cell outputs 3 Load each load cell as independently as possible and determine which load cell has the lowest output in Raw Counts Note the reading of the lowest output load cell This is the reference load cell 4 Load in sequence the higher output load cells as independently as pos...

Page 131: ...TANDARD CALIBRATION CAL If Std Cal If Initial Cal STD CAL CAL ZERO CAL Zero Cal OK WAIT up to 15s INPUT VAL TEST WEIGHT LOAD SCALE Next Test Wgt SPAN CALIBRATION Zero Cal ERROR SPAN Cal ERROR Too much dead load or offset in the load cell Exit key or 5th Span Wgt SETUP INPUT POWER or Correct with Coarse Zero Next Span Weight Too little or too much weight on the scale Note Dual Input Scales Only Set...

Page 132: ...d by 8 d Increments d Programmable to multiples or sub multiples of X1 X2 X5 down to X0 0001 Display 6 digit 9 23 mm numeric weight LC display 8 digit 0 45 11 mm alphanumeric LCD message units display 21 Segment Bargraph for process control indications also used for level indications on the MSI Forklift Scale LFT versions Anunciators for measurement modes Sunlight visible LED indicator for Totaliz...

Page 133: ...ocess relays or sirens 7 SPDT form C 1A 115VAC relays are provided internal to the 3750 meter for direct set point interfacing The 8th output is a TTL compatible Logic output Connections are made through liquid tight feedthrough connectors to screw terminal blocks Statistics Package Adds complete statistics package for up to 350 ID codes depends on expan sion memory Each ID Code stores and compute...

Page 134: ... name and stores independently units tare display mode two 20 byte print strings and total with weighments counter Audible Set Points Indicator Coupled with the internal Set Points an overload alarm can sound at any weight Can also be used for accept or an out of limits indicator for blind check weighing Compatible with AC or battery powered units Aux Digital Inputs Any key or all keys can be dupl...

Page 135: ...MSI 3750 Digital Weight Indicator User Guide Page 135 M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L METER MOUNTING BRACKET ...

Page 136: ...US 32 20 SPC 33 21 34 22 35 23 36 24 37 25 38 26 39 27 40 28 41 29 42 2A 43 2B 44 2C 45 2D 46 2E 47 2F 48 30 0 49 31 1 50 32 2 51 33 3 52 34 4 53 35 5 54 36 6 55 37 7 56 38 8 57 39 9 58 3A 59 3B 60 3C 61 3D 62 3E 63 3F 64 40 65 41 A 66 42 B 67 43 C 68 44 D 69 45 E 70 46 F 71 47 G 72 48 H 73 49 I 74 4A J 75 4B K 76 4C L 77 4D M 78 4E N 79 4F O 80 50 P 81 51 Q 82 52 R 83 53 S 84 54 T 85 55 U 86 56 V...

Page 137: ...BLED KEY FUNCTION MENU 24HR SEC 24HR MIN1 2HR SEC 12HR MIN BACKLIGHT MENU ON AUTO OFF LOW MEDIUM HIGH BACKLIGHT BRIGHTNESS MENU 24 HOURS 8 HOURS 4 HOURS 2 HOURS 1 HOUR 30 MIN 10 MIN DISABLED AUTO OFF MENU POWER SETUP MENU LIGHTING BRIGHT AUTO OFF ENTER ENTER ENTER EXIT SETUP POWER LOCKMODE MENU GRNDTOTL CLRLATCH ZERO VIEW UNITS TOTAL TEST TARE STRING 2 STRING 1 STATS SETUP SETPOINT SCALENUM PRINT ...

Page 138: ...UV F3 TARE KEY MODE MENU TARE SETUP MENU TARE AUTO CLEAR MENU ON TOTAL ENABLED DISABLED TAREMODE AUTO CLR ENTER ENTER ENABLED DISABLED TAREALL ENTER TAREALL MENU AUTO KBD UPDN EXIT SETUP TARE T ASCII ID STRING 1 Enter up to 20 Char s NORMAL PER CENT DISABLED NUM DISP MENU ID CODE SETUP MENU ID NAME MENU INPUT ID NAME NUM DISP ID NAME STRING 2 ENTER ENTER ENTER Usually F1 ID STRING 2 Enter up to 20...

Page 139: ...E CONTROL MOTION INTERVAL SETTINGS COMMPORT2 TYPE COMM PORT SETUP MENU EVEN ODD NONE COMPORT2 COMPORT1 COM2TYPE SCALE ID 300 600 1200 2400 4800 9600 19 200 ENABLED DISABLED DUPLEX OFF TALK LISTEN PRINTKEY CONTIN ON CTS ON SP1 ON SP2 SP1 SP2 ON TOTAL ON CHANG ON LOAD DATA STRTLINE END LINE WAIT CHR Enter Up to 255 Characters Enter Up to 4 Characters Enter 1 Character BAUDRATE STOPBITS DATABITS PARI...

Page 140: ... GREATER LESSTHAN ENTER ENTER ENTER ABC COMM 1 COMM 2 DISPLAY ON OFF ASSIGN MESSAGE OUTPUT MENU ENTER ENTER ENTER ENTER ON OFF BLANKLCD BLINKLCD NORMAL INPUT SET PT VALUE 0 9 VALUE ENTRY SCREEN DEAD ZONE VALUE SCREEN MESSAGE ENTRY DISPLAY MODE MENU WEIGHT MODE MENU 0 9 INPUT DEAD ZONE VALUE SP MODE 1 8 SET PT 1 SET PT 2 SET PT 3 SET PT 4 SET PT 5 SET PT 6 SET PT 7 SET PT 8 TEST SP 1 8 ENTER ENTER ...

Page 141: ...in Wire Sense Optional 2 3 4 5 6 EXC SIG SIG EXC SHIELD S E N S E 7 S E N S E Sense Optional Note Wire colors shown are standard for MSI supplied Load Cells Colors from other manufacturers will vary 1 2 3 4 SW12 Coarse Zero Dip Switch SW1 SW4 RS 232 CONNECTIONS TB3 RS 232 1 RS 232 Shield Ground RS 232 Xmitter Output RS 232 Receive Input RS 232 RTS Output RS 232 CTS Input RS 232 Signal Ground COMM ...

Page 142: ...O RS 232 TXD Output OPTION BOARD COMM PORT 2 2nd Comm Port Option FO OUT GND TXD RTS RXD TXD TXD 8 AUXILIARY DIGITAL INPUT AUX DIGITAL INPUT 1 2 3 4 5 6 SHLD TXD RXD RTS CTS SGND 1 3 5 6 4 2 Common pin 1 Auxiliary Input pin 2 low true TB2 Auxiliary input can be a contact closure normally open a MOSFET or BJT normally off or a TTL output normally high 5V max e g connect a N O contact between pins 1...

Page 143: ...ONNECTIONS RELAY OUTPUTS HI LO TTL CM NO NC SP7 CM NO NC SP6 CM NO NC SP5 CM NO NC SP4 CM NO NC SP3 CM NO NC SP2 CM NO NC SP1 GND 5V Relay Common Contact Relay Normally Closed Contact 5V Out 20mA TTL Output Ground TTL Output Lo True on Set Point 8 Relay Normally Open Contact TTL Output Hi True on Set Point 8 Typical for all seven relays ...

Page 144: ... alterations made by others except those repairs or alterations made with its specific written consent nor shall Measurement Systems International be liable for any damages or delays whether caused by defective workmanship materials or otherwise The Company shall not be liable for any personal injury or property damage resulting from the handling possession or use of the equipment by the customer ...

Page 145: ......

Page 146: ...onal Printed in U S A PUB225 10 96B I N T E R N A T I O N A L Measurement Systems 14240 INTERURBAN AVENUE SOUTH SEATTLE WASHINGTON 98168 4660 U S A 206 433 0199 FAX 206 244 8470 Web www msiscales com Email info msiscales com MADE IN THE USA ...

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