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Hardy Instruments A Series, Operation And Installation Manual

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Chapter 5 - Calibration

5-3

c.

A zero reference point will vary from 
system to system depending on the 
“Dead Load” of the vessel. “Dead Load” 
is the weight of the vessel and appurte-
nances only, with no product loaded. In 
our example we will assume the dead 
load to be 500 pounds. (See Fig. 5-2)

 FIG. 5-2 MILLIVOLTS/WEIGHT SCALE

Based on the example, the operating range for this 
scale is 5-10 mVDC with a 500 pound weight range. 
Understand that after zeroing the instrument, the 0 
reading refers to the zero reference point and not 
absolute 0 mVDC or absolute 0 weight.

NOTE:

Load cell/point measurements are checked with a dig-
ital volt meter at the J2 connector on the front of the 
module or by using I

NTEGRATED

 T

ECHNICIAN

 with the 

HI 215IT Junction Box.

Load Check

 Step 1.

Place a load (weight) on the scale or vessel 
and check to see if the weight reading 
changes on the ladder logic display in the 
proper direction.

Summary of Contents for A Series

Page 1: ...rporate Headquarters 9440 Carroll Park Drive Suite 150 San Diego CA 92121 Phone 858 278 2900 FAX 858 278 6700 Web Site http www hardyinst com Hardy Instruments Document Number 0596 0247 01 Rev K Copyright November 2000 Hardy Instruments Inc All Rights Reserved Printed in the U S A 941028 ...

Page 2: ...audits and performance measurement Emergency troubleshooting and repair To request Emergency Service and Troubleshooting Start up Installation Calibra tion Verification or to discuss a Maintenance Agreement please call 800 821 5831 Ext 1757 or Emergency Service after hours Standard Hours 6 00 AM to 6 00 PM Pacific Standard Time and weekends Ext 1111 Outside the U S Hardy Instruments has built a ne...

Page 3: ...ations for a Standard HI 1756 WS 2WS Weigh Scale Module 2 1 Channels 2 1 Conversion Rate 2 1 Averages 2 1 Resolution 2 1 Input 2 1 Non Linearity 2 1 WAVERSAVER 2 1 Excitation Monitor 2 1 Common Mode Rejection 2 1 Common Mode Voltage Range 2 2 Backplane Input Voltage 2 2 Backplane Current Load 2 2 Backplane Power Load 2 2 C2 Calibration Input 2 2 Cable lengths 2 2 Load Cell Excitation 2 2 C2 Calibr...

Page 4: ...Load Sensor with C2 3 6 HI 1756 Remote Terminal Assembly HI 1756 XX RT 3 7 RTA Cable Assembly 3 8 Hardy HI 215IT Junction Box 3 9 CHAPTER 4 SETUP4 1 A Brief Description of Chapter 4 4 1 Power Check 4 1 LEDS 4 2 Scale Data LEDs 4 2 OK Module Status LED 4 2 Reset Module Message 4 2 Setting Up Communications Between the PLC and the HI 1756 WS 2WS Weigh Scale Module 4 2 Configuration Parameters for th...

Page 5: ...tion Setup Procedures 4 21 Setting the Unit of Measure 4 21 Setting the Motion Tolerance Value 4 22 Setting the Zero Tolerance Value 4 22 Setting the Auto Zero Tolerance Value 4 22 Setting the Number of Readings Averages 4 22 Setting the Span Weight Value 4 22 Setting the WAVERSAVER Value 4 22 CHAPTER 5 CALIBRATION 5 1 A Brief Description of Chapter 5 5 1 Pre Calibration Procedures 5 1 Electrical ...

Page 6: ...when Performing a C2 Calibration with The Button 7 1 Scale LED is Flashing Red 7 1 Return Codes 7 1 Mechanical Inspection 7 5 Load Sharing and Load Sensor Checkout 7 6 Guidelines for Instabilities on Formerly Operating Systems 7 7 Electrical 7 8 Mechanical Stability and Configuration Settings 7 9 INDEX GLOSSARY OF TERMS ...

Page 7: ...SCHEMATIC HI 1756 2WS DUAL CHANNEL 3 9 HARDY HI 215IT JUNCTION BOX WIRING DIAGRAM 3 9 CHAPTER 4 SETUP 4 1 MODULE LEDS SINGLE CHANNEL 4 1 MODULE LEDS DUAL CHANNEL 4 1 COMMUNICATION CONFIGURATION DIALOG BOX 4 3 DISCRETE DATA 4 7 PARAMETERS DIALOG BOX 4 10 PARAMETERS DIALOG BOX CONT D 4 10 MESSAGE CONFIGURATION EXAMPLE 4 11 CHAPTER 5 CALIBRATION 5 1 PROPERLY INSTALLED LOAD CELL W NO BINDING 5 2 MILLI...

Page 8: ... WEIGH SCALE MODULE II GUIDELINES FOR INSTABILITIES ON FORMERLY OPERATING SYSTEMS 7 7 GUIDELINES FOR INSTABILITIES ON FORMERLY OPERATING SYSTEMS ELECTRICAL 7 8 MECHANICAL STABILITY AND CONFIGURATION SETTINGS 7 9 ...

Page 9: ...he product be sure you understand all cautions warnings and safety procedures stated or referenced in this manual And to get the best service from this product follow the practices recommended in this manual Hardy Instruments appreciates your business We welcome all corrections or suggestions for improve ment of this manual Should you not understand any information in this manual or experience any...

Page 10: ...t users have a basic understanding of process control and can interpret ladder logic instructions as needed to generate the electronic signals that control their application s The HI 1756 WS Weigh Scale Module Series A is configured for single channel operation while the HI 1756 2WS Weigh Scale Module Series A is config ured for dual channel operation Both modules can be used for a wide variety of...

Page 11: ...n the front of the module or via ladder logic A C2 weighing system consists of up to eight C2 load sensors a junction box interconnect cable and an instrument with C2 capabilities e g the HI 1756 Each Hardy Instruments C2 certified load sensor out puts digital information used for the calibration The modules reads the sensor outputs and detects the num ber of active sensors It then calibrates the ...

Page 12: ...rn to Zero Test Optional Requires the HI 215IT Series Junction Box to monitor individual load sensors This test compares the origi nal voltage reading saved at calibration against the current voltage reading of an empty vessel The test checks for damaged load sensors due to electrical zero shift or abnormal mechanical forces that cause bind ing on one or all of the load sensors in the system Weigh...

Page 13: ...re material build up in the weighing system within a pre set auto zero tolerance For auto zeroing to work cor rectly any live weight plus any weight previously zeroed on the scale must be below the set Auto Zero Tolerance value and the scale must not be in motion This is not used on all applications and should be reviewed before use NOTE The amount of weight zeroed off is cumulative The Autozero c...

Page 14: ...HI 1756 WS WEIGH SCALE MODULE 1 6 ...

Page 15: ...efore attempting an installation or repair of this instrument Specifications for a Standard HI 1756 WS 2WS Weigh Scale Module Channels 2 Channels Single Channel HI 1756 WS Dual Channel HI 1756 2WS Conversion Rate 50 updates per second Averages 1 255 User Selectable in single increments Resolution Internal 1 8 388 608 Input Up to eight 8 350 ohm Full Wheatstone Bridge Strain Gauge Load Sensors Cell...

Page 16: ...ble 250 feet maximum of C2 authorized cable Maximum of 4 load sensors with IT Junction box Load Cell Excitation 5 VDC 1 15 W maximum Isolation from digital section 1000 VDC minimum C2 Calibration Output Isolation from digital section 1000 VDC minimum Environmental Requirements Temperature Coefficient Less than 0 005 of full scale per degree C for Cal LO and Cal HI reference points Operating Temper...

Page 17: ...able Assemblies Hardy Part C6 HI 1756 XX C6 Cable Length 6 ft 1 525 meters from the single channel module to the RTA Hardy Part C6 HI 1756 XX DC6 Cable Length 6 ft 1 525 meters from the dual channel module to the RTA HI 215IT Series Junction Box NEMA rated waterproof enclosure which sums from one to four load sensors load sensors PS1 NEMA 4 Painted Steel SS1 NEMA 4X Stainless Steel FG1 NEMA 4X Fib...

Page 18: ...ar month day and calid must be set by the operator Metric lbs 0 WAVERSAVER 1 Hz 3 SpanWeight 10 000 00 CalLowWeight lbs 0 Num Averages 10 ZeroTrackEnable False 0 ROCTimeBase 10 ZeroTolerance 10 AutoZeroTolerance 10 0 lbs MotionTolerance 5 0 lbs Parameter Default Setting Table 2 1 Default Parameters ...

Page 19: ...any kind and report any damage to the carrier company immediately Step 2 Check to see that everything in the pack age matches the bill of lading You should normally have HI 1756 WS or HI 1756 2WS Weigh Scale Module Operation and Installation Manual Step 3 Write down the Model and Serial number of the module You may need this informa tion when contacting The Customer Sup port Department for parts o...

Page 20: ...S into the ControlL ogix Chassis Step 1 Make sure that the module is oriented cor rectly for installation See Fig 3 1 FIG 3 1 POSITIONING THE MODULE FOR INSTALLATION Step 2 Gently slide the module into the Chassis Step 3 Slide the digital board between the PCB Guides on the top plate and bottom plate of the chassis to line up the module con nector with the backplane connector Step 4 When the modul...

Page 21: ...G 3 3 MODULE INSTALLED IN CHASSIS Removing the Module from the Chassis Step 1 Press down on the top and bottom proces sor releases simultaneously and pull the module out of the chassis See Fig 3 3 Step 2 Store the module in a safe secure location in an anti static bag or its original package ...

Page 22: ... cable and connector so it allows the module door to be shut Step 3 With the plug oriented correctly See the pin out diagram above plug the I O male connector into the I O connector at the front of the module Step 4 Verify that the connector is completely plugged in before operating the module NOTE Most problems are due to loose connections Be sure to check the I O connection first if you have a p...

Page 23: ...Chapter 3 Installation 3 5 receiving information from the load cells or if the relays do not operate correctly FIG 3 4 HI 1756 WS WITH DOOR OPEN FIG 3 5 HI 1756 2WS WITH DOOR OPEN ...

Page 24: ...756 WS WEIGH SCALE MODULE 3 6 Load Cell Wiring Diagrams Industry Standard Load Cells FIG 3 6 INDUSTRY STANDARD LOAD CELLS WIRING DIAGRAM Hardy Load Sensor with C2 FIG 3 7 HARDY LOAD SENSOR C2 WIRING DIAGRAM ...

Page 25: ...oad sensor s It comes with a stan dard 35 mm Din Rail Mounting and requires at least a 5 inch DIN rail for mounting FIG 3 8 REMOTE TERMINAL ASSEMBLY NOTE When using load cells that do not have sense lines you will need to jumper the Sense to the Excitation and the Sense to the Excitation for one or both channels See Fig 3 9 FIG 3 9 RTA WITH JUMPERS FOR LOAD CELLS WITHOUT SENSE LINES Jumpers ...

Page 26: ...ot cable that connects to the HI 1756 WS module FIG 3 10 RTA CABLE ASSEMBLY HI 1756WS SINGLE CHANNEL FIG 3 11 RTA CABLE SCHEMATIC HI 1756WS SINGLE CHANNEL Six 6 foot cable that connects to the HI 1756 2WS module FIG 3 12 RTA CABLE ASSEMBLY HI 17562WS DUAL CHANNEL ...

Page 27: ...WS DUAL CHANNEL Hardy HI 215IT Junction Box FIG 3 14 HARDY HI 215IT JUNCTION BOX WIRING DIAGRAM NOTE When connecting the Hardy HI 215IT Junction Box you must remove the two factory installed jumpers 1 2 and 5 6 on the module install sense lines Load Cell Connector J1 ...

Page 28: ...HI 1756 WS WEIGH SCALE MODULE 3 10 ...

Page 29: ...for calibration and operation The Setup procedures require Allen Bradley s RS Logix 5000 Allen Bradley RSLinx or RSLinx Lite Power Check Step 1 To make or change settings there must be power to both the PLC and the module Verify that the LED s are lit for normal operation See Figs 4 1 and 4 2 FIG 4 1 MODULE LEDS SINGLE CHANNEL FIG 4 2 MODULE LEDS DUAL CHANNEL ...

Page 30: ...teady Red Internal Hardware watchdog timer fault e g bad Hardware or Firm ware ASIC is non operational Flashing Red Communication Error Reset Module Message Modules with communication errors indicated by a flashing red Module Status LED can be reset by a reset message Message Type CIP Generic Service Code 5 Hex Class Name 1 Instance Name 1 Setting Up Communications Between the PLC and the HI 1756 ...

Page 31: ...mbly Instance 101 Size 11 Output Assembly Instance 146 Size 1 Configuration Assembly Instance 241 NOTE Size 0 configuration table not used or with version 2 3 software Size 64 8 bit for a 1 channel unit Size 128 8 bit for a 2 channel unit Step 5 Select DATA REAL from the Comm For mat pull down list FIG 4 3 COMMUNICATION CONFIGURATION DIALOG BOX Step 6 Open the Connection Tab Step 7 Set the RPI to ...

Page 32: ...rame ters are sent in the correct format and range NOTE DINT Parameters can be interpreted as floating point based on the value of a bit within the DecimalPoints parameter of the channel Parameter Offset In Words Single Channel Config_rev_num0 0 ChanEnabled0 1 DecimalPoints0 2 Metric0 3 NumAverages0 4 Waversaver0 5 SpanWeight0 6 CalLowWeight0 7 ZeroTrackEnables0 8 AutoZeroTolerance0 9 MotionTolera...

Page 33: ...ey may look more like this Local 1 C Data 0 Local 1 C Data 1 and so on Dual Channel Config_rev_num1 16 ChanEnabled1 17 DecimalPoints1 18 Metric1 19 NumAverages1 20 Waversaver1 21 SpanWeight1 22 CalLowWeight1 23 ZeroTrackEnables1 24 AutoZeroTolerance1 25 MotionTolerance0 26 TareWeight0 27 EnableButton0 28 RocTimeBased0 29 ZeroTolerance0 30 Spare1_0 31 Parameter Offset In Words ...

Page 34: ...elow to match each bit location to the state it represents For Example If the satausword is 69 with a binary value of 0000 0000 0100 0101 bits 0 2 an 6 are on Bit 0 indicates an A D conversion error bit 2 indi cates the unit is calibrated in lbs and bit 6 indicates the scale is in motion NOTE The screen in Fig 4 4 shows input data in floating point format To read the data bits the Word0 status wor...

Page 35: ...SH 0x0004 Unit calibrated in lbs If the bit is off calibrated in kgs STATUSZTRACK 0x0008 Auto Zero Tracking is turned on STATUSBUTTONENABLED 0x0010 Enabled Disabled calibrate button STATUSINMOTION 0x0040 Weight is changing on the scale ERRORNOCAL 0x0080 The unit is at factory default set tings ERROREEPROMWRITE 0x0100 EEPROM Hardware Error ERROREXCITEMON 0x0200 Excitation monitor error ERRORMAX144 ...

Page 36: ... Set if channel is enabled Word Number Definition Type Parameter Description 1 DINT ChanActive Flag determines if a channel is alive Legal values are 0 Channel Off or 1 Channel On 2 DINT calyear Year of last Calibration 3 DINT calmonth Month of last Calibration 4 DINT calday Day of last Calibration 5 DINT 2 calid 2 ID of calibrator using initials e g JB 6 DINT CalibType Read Only Button 3 C2 1 Har...

Page 37: ...bration weight high in lbs or kgs 11 REAL CalLowWeight Calibration weight low in lbs or kgs 12 DINT NumAverages Legal Values 1 255 13 DINT ZeroTrackEnable Enable for Zero Tracking Legal Values 0 Not Enabled 1 Enabled 14 DINT ROCTimeBase Legal Values 1 1800 seconds 15 REAL ZeroTolerance In lbs or kgs 16 REAL AutoZeroTolerance In lbs or kgs 17 REAL MotionTolerance In lbs or kgs Type Parameter Descri...

Page 38: ...HI 1756 WS WEIGH SCALE MODULE 4 10 FIG 4 5 PARAMETERS DIALOG BOX FIG 4 6 PARAMETERS DIALOG BOX CONT D ...

Page 39: ...Message source a tag defining the data sent to the HI 1756 WS 2WS Number of elements defined by the com mand used Message destination a tag where the reply data will be written FIG 4 7 MESSAGE CONFIGURATION EXAMPLE All commands begin with the following fields Command DINT The command number Channel DINT The channel number must be 0 NOTE Some commands require additional fields as speci fied in the ...

Page 40: ...nd the limits set by the zero toler ance parameter NOTE The amount of weight zeroed off is cumulative The Autozero command will fail if the current gross weight plus any previously zeroed amount exceeds the zero tolerance value STATUSWORD the command failed because either the weight was not stable in motion or there was some kind of A D error Tare Command TARECMD The Tare Command requests the curr...

Page 41: ...can be used to abort a calibration or parameter entry session Command Number 0x10 Hexadecimal Channel Number 0 or 1 Number of Elements 8 Error Return Values None Enable Calibration Button Command ENABLEBUTTON CMD The Enable Calibration Button Command activates the calibration button Command Number 20 Hexadecimal Channel Number 0 or 1 Number of Elements 8 Error Return Values None Disable Calibratio...

Page 42: ...or or all three HARDCALFAILCOUNTS less than 100 counts between the zero and the span weights Cal High Command CALHIGHCMD The Cal High Command Sets the Span Weight parameter to the current A D average counts when doing Hard CAL Command Number 0x65 Hexadecimal Channel Number 0 or 1 Number of Elements 8 Error Return Values STATUSWORD there was a conversion error weight in motion or an A D error or al...

Page 43: ...t cal ibration points to ensure the the scale is returning cor rect input from each calibration point before running new calibration command Command Number 0x63 Hexadecimal Channel Number 0 or 1 Number of Elements 8 Return Values Command DINT Channel DINT Status DINT Zero counts DINT Cal zero counts DINT Cal low counts DINT Cal high counts DINT CalibK weight per count REAL ADC as of the time the c...

Page 44: ... return to zero load cell 1 DINT RTZ_R_2 Test result return to zero load cell 2 DINT RTZ_R_3 Test result return to zero load cell 3 DINT RTZ_R_4 Test result return to zero load cell 4 REAL DVM_combined Millivolts Volt all load cells REAL DVM_1 Millivolts Volt load cell 1 REAL DVM_2 Millivolts Volt load cell 2 REAL DVM_3 Millivolts Volt load cell 3 REAL DVM_4 Millivolts Volt load cell 4 REAL IREF_w...

Page 45: ...s detected C2SWITCH The number of JBOX switches detected CAPACITY Combined sensitivity of C2 load cells SENSITIVITY Combined sensitivity of C2 load cells Read C2 Sensor Serial Number READC2SERIALN UM Reads the serial number of a specified C2 load sensor Must be preceded by the C2SEARCH command Command Number 0x70 Hexadecimal Required Command Data COMMAND CHANNEL SENSOR 0 7 Number of specific Load ...

Page 46: ...ents 8 NOTE See the Timed Out Command section Return Data COMMAND CHANNEL STATUS Returns status of the last timed out command Write Parameters WRITEPARAM Writes all the parameters Command Number 0x68 Hexadecimal Channel Number 0 or 1 Number of Elements 84 Return Data COMMAND CHANNEL STATUS The status is 0 if the command suc ceeded If there was a range error detected in one of the parameters a non ...

Page 47: ...le 4 1 Read Live Weight READLIVEWEIGHT Reads gross weight in units set by the Metric Parame ter either lbs or kgs Command Number 0x6B Hexadecimal Channel Number 0 or 1 Number of Elements 8 Return Data COMMAND CHANNEL STATUS STATUSWORD Gross weight in units determined by the Metric Parameters Net Weight Rate of Change ADC value A REAL number between 1 0 and 2 0 Command Table Command Number Hex ZERO...

Page 48: ...TENONVOLATILE 4 RELOADNONVOLATILE 0x10 GETSTATUS 0x80 ENABLEBUTTONCMD 0x20 DISABLEBUTTONCMD 0x40 SETDEFAULTPARAMS 0x94 CALLOWCMD 0x64 CALHIGHCMD 0x65 C2CALCMD 0x66 WRITEPARAM 0x68 READPARAM 0x69 WEIGHSYSTEST 0x6D C2SEARCH 0x6E READC2SERIALNUM 0x70 READLIVEWEIGHT 0x6B Command Number Hex Output Commandword 16 bits 16 bits Channel 1 Channel 0 ...

Page 49: ...equal HARCALFAILCOUNTS 8 failure not enough ADC counts between high low Timed Out Commands The ASIC on the HI 1756 WS module requires that a command receive a reply within 65 milliseconds This is not enough time to complete some of the com mands The commands subject to time out are CALLOWCMD C2CALCMD WEIGHSYSTEST C2SEARCH The reply to these commands is sent before the com mands are actually perfor...

Page 50: ...Command works as an offset of the calibrated Zero NOTE The amount of weight zeroed off is cumulative The zero command will fail if the current gross weight plus any previously zeroed amount exceeds the zero tolerance Setting the Auto Zero Tolerance Value When the Auto Zero Tolerance is entered and Auto Zero Tracking is enabled any weight within the entered tolerance of zero and not in motion will ...

Page 51: ...If you have a 100 pound weight and you place it on the scale the Span Weight would be 100 pounds Setting the WAVERSAVER Value There are 5 selectable levels 0 provides the least vibration immunity with the fastest response time 4 provides the most vibration immunity with the slow est response time Default setting is 2 Immunity Setting 7 5 Hz 0 3 5 Hz 1 1 0 Hz 2 0 5 Hz 3 0 25 Hz 4 ...

Page 52: ...HI 1756 WS WEIGH SCALE MODULE 4 24 ...

Page 53: ... load cells have been properly installed See your load cell I M manual for proper installation instructions Step 2 An arrown on some sensors and cells indi cates the correct direction of the applied load If the arrow points in the wrong direction reposition the load cell Step 3 Check for Binding on the Load Cell or other parts of the weighing system CAUTION BINDING ON A SCALE VESSEL OR LOAD CELL C...

Page 54: ...350 Ohm load cells points b The expected output from each load cell point depends on the mV V rating of the load cell point and the weight For example a 2mV V load cell point will respond with a maximum of 10 mVDC at full system weight capacity which includes the weight of the vessel and the weight of the product as mea sured by the load cell point If the load cell point weight capacity is rated a...

Page 55: ...g range for this scale is 5 10 mVDC with a 500 pound weight range Understand that after zeroing the instrument the 0 reading refers to the zero reference point and not absolute 0 mVDC or absolute 0 weight NOTE Load cell point measurements are checked with a dig ital volt meter at the J2 connector on the front of the module or by using INTEGRATED TECHNICIAN with the HI 215IT Junction Box Load Check...

Page 56: ...the weight and proceed to calibrate the module C2 Calibration About C2 Calibration C2 calibration requires C2 load sensors If you do not have C2 load sensors you must perform a traditional calibration with test weights which we call a Hard Calibration The Weigh Module reads the perfor mance characteristics of each individual load cell and detects the quantity of load cell s in the system C2 Calibr...

Page 57: ...the first time and you are not sure what parameters to set use the default parameters which are set by the module at power up Once the calibration is successful feel free to change the parameters to meet the requirements of your weighing process See Chapter 4 Setup Use the Button for calibration at any time after the weigh ing process parameters have been set ...

Page 58: ...truments Inc Web Site http www hardyinst com Step 3 Click on Support Step 4 Click on Sample Programs Step 5 You will find the sample programs under the HI 1756 WS Heading Hard Calibration Hard Calibration is the traditional method of calibra tion that uses test weights Hardy recommends that the test weights total 80 to 100 of the scale capacity Hard Calibration Procedures Step 1 Place the low cali...

Page 59: ...For more information on the Cal High Command go to Chapter 4 Setup page 4 12 Step 6 Remove the weight from the scale Step 7 Send a Write Non Volatile Command WRITENONVOLATILE The Write Non Volatile Command causes all parameters including cali bration constants to be saved to the non volatile memory Command Number 4 Hexadecimal Channel Number 0 or 1 Number of Elements 8 Hard Calibration Ladder Logi...

Page 60: ... net a Type the following URL http www hardyinst com b Click on the Support button c Click on Sample Programs d Click on the pull down menu for the product you are calibrating e Click on the Ladder Logic Example for the HI 1756 WS Weigh Module Hard Calibration Step 4 If you do not have access to the Internet call your local Hardy representative or Hardy Instruments Customer Support and we will for...

Page 61: ...e weigh scale module See Fig 6 1 FIG 6 1 COMMUNICATION CONFIGURATION DIALOG BOX Input Data This is the discrete input data which is in module defined data type LOCAL X I where X is the slot number See Fig 6 2 0 Bits 15 0 STATUSWORD for Channel 0 Bits 31 16 STATUSWORD for Channel 1 1 Gross Weight 5 2 Net Weight 6 3 Rate of Change 7 4 loadcellcurrent milliamps 8 9 10 TimeStamp NOTE The TimeStamp is ...

Page 62: ...HI 1756 WS WEIGH SCALE MODULE 6 2 FIG 6 2 DISCRETE DATA ...

Page 63: ...od ule using an MSG instruction a returned status indi cates whether the module passed or failed It also provides a reason code if it failed Fig 7 1 shows the over all process There are three possible status returns for most commands 0 pass or success a positive value status or condition code or a negative value error code Fig 7 1 separates out the Write Parameters command for which a return value...

Page 64: ... Cmd passed Is Status Positive Is Status tive Nega A2 A1 Index of return values for Write Parameter 1 CALACTIVE 2 CALYEAR 3 CALMONTH 4 CALDAY 5 CALID 6 CALIB TYPE 7 TAREWEIGHT 8 METRIC 9 WAVERSAVER 10 SPAN WEIGHT 11 CAL LOW WEIGHT 12 NUMBER AVERAGES 13 ZERO TRACK ENABLE 14 ROC TIME BASE 15 ZERO TOLERANCE 16 AUTO ZERO TOLERANCE 17 MOTION TOLERANCE ...

Page 65: ...ilure 2 B2 Output from the A D con verter to processor is bad The module shows a solid red LED C2 Contact Customer Support to return module for repair statusinmotion 64 B3 The rate of scale weight change over 1 second exceeds the motion tolerance setting If the setting is too low motion may be indicated when no changes are occurring C3 If the weight is actually changing stabilize it If not increas...

Page 66: ...command number exists c2failnodevs 6 B7 When trying to do a C2 cali bration the module cannot read the data from the load cells C7 Check the wiring to ensure proper connections and orienta tion Find the problem load cell by disconnecting them at the sum ming box c2failcapeq 7 B8 C2 load cells have unequal cap acities due to either the use of mismatched load cells or faulty C2 programming C8 Run th...

Page 67: ... Vertical flexures should be avoided 3 Do not use flexures to correct for misaligned piping 4 Do not use hose flexures to make right angle bends 5 Non flexed piping should have an unsupported horizontal run using a ratio of 36 times it s diameter 6 Pipe flexure lengths should be a ratio of 6 times it s diameter 7 Feed and discharge piping flexed 8 Are the flex joints on the correct side of the val...

Page 68: ...Larger differences due to motors and piping should not exceed 2 mV c If there isn t any motors valves or piping to explain the mV difference adjust the corners and balance the mV readings d Use shims or if equipped adjusting bolts on the load cell mounting hardware e Drawing a load cell map will help determine the correct leg to adjust and in which direction Three load cells balance like a three l...

Page 69: ...ng Systems See Figure 7 5 FIG 7 5 GUIDELINES FOR INSTABILITIES ON FORMERLY OPERATING SYSTEMS Check for Electrical Stability OK Contact Hardy Instruments Customer Support Check for Mechanical Stability OK Yes Check Configuration settings for Stability No OK Yes Yes B1 B2 B3 No No ...

Page 70: ...ill and discharge piping Ground all to a common point to eliminate electrical differences in potential and static build up Cable Routing Separate high voltage sources and cables from low voltage signal cables Stay a minimum of 14 inches from Magnetic fields and SCR controls Avoid parallel high voltage and signal cable runs Cable Shielding Ground low voltage cable shields only at the controller end...

Page 71: ...ls that support motors and piping Insure pneumatic lines are not applying pressure to the vessel when energized Use check stay rods to minimize vessel movement Insure the check rods are loose and not interacting with the vessel Power down all vibration vacuum and pressurization equipment during the test process B2 Configuration settings Incorrect Waversaver settings can cause unstable weight readi...

Page 72: ...HI 1756 WS MANUAL 7 10 ...

Page 73: ...f Chapter 5 5 1 A Brief Description of Chapter 6 6 1 A Brief Description of Chapter 7 7 1 7 8 A D average counts 4 14 5 7 abnormal mechanical forces 1 4 About C2 Calibration 5 4 About Hardy Manuals 1 1 About Parameters 4 8 About the Module I O Connector 3 4 AC or high voltage DC module 3 2 Allen Bradley Control Logix 1 2 Allen Bradley RSLinx 4 1 Allen Bradley s RS Logix 5000 4 1 analog to digital ...

Page 74: ...APEQ 4 21 C2FAILNODEVS 4 21 C2ROM 4 17 C2SEARCH 4 21 C2SWITCH 4 17 Cable lengths 2 2 Cal High Command 5 7 Cal High Command CALHIGHCMD 4 14 Cal Low Command 5 6 Cal Low Command CALLOWCMD 4 13 Calibration Setup Procedures 7 5 calLowCount parameter 5 6 CALLOWWEIGHT 4 21 CHANNEL 4 17 Channel Number 4 12 Class Name 4 2 4 11 Command Number 4 12 Command Table 4 19 Commands 4 11 Common Mode Rejection 2 1 C...

Page 75: ...l channel 1 2 DVM 1 4 DVM readings 1 4 E Electrical 7 8 Electrical Check Procedures 5 2 electrostatic discharge 3 1 Environmental Requirements 2 2 Error Code List 4 21 Error Return Value 4 12 Error Return Values 4 12 EXC SIG Outputs 5 2 Excitation Monitor 1 3 2 1 excitation wire s 1 3 F Filling Operation is a Gain in Weight process 7 3 flexible connectors 5 1 G GETSTATUS 4 21 Guidelines for Instab...

Page 76: ...unction Box 1 4 HI 215IT Series Junction Box 1 4 2 3 3 4 high voltage cables 3 2 http www hardyinst com 5 6 Humidity Range 2 2 I I O Config folder 4 2 Illegal values 4 4 INDEXOUTOFRANGE 4 21 7 4 Industry Standard Load Cells 3 6 Input 2 1 Input Data 6 1 install 1 1 Installing the HI 1756 WS 2WS 3 1 Installing the Module I O Connector 3 4 Instance Name 4 2 4 11 Integrated Technician 5 3 Integrated T...

Page 77: ...tion Settings 7 9 Message Type 4 2 4 11 Model and Serial number 3 1 Module Properties 4 3 mV 1 4 mV V rating 5 2 mV V readings 1 4 N NEVER touch the connector pins 3 2 Non Linearity 2 1 NOSUCHCMD 4 21 7 4 NOTALLOWED 4 21 Number of Elements 4 12 O OK Module Status LED 4 2 Operating Temperature Range 2 2 Optional Equipment 2 3 OUTOFTOLERANCE 4 12 4 21 Output Table 4 20 Overview 1 1 P Parameters 4 8 ...

Page 78: ...inal Assembly 3 4 Remote Termination Assembly 1 1 Removing the Module from the Chassis 3 3 Report any damage 3 1 Resolution 2 1 Return to Zero Test 1 4 RPI 4 3 RSLinx Lite 4 1 RTA Cable Assemblies 2 3 RTA Cable Assembly 3 8 S Sample Programs 5 6 Scale Capacity 4 22 Scale Data LEDs 4 2 Scale LED does not Come Back on 7 1 Scale LED is Flashing Red 7 1 Search for C2 Load Sensors C2SEARCH 4 16 Set Def...

Page 79: ...cations for a Standard HI 1756 WS 2 1 STATUSWORD 4 12 4 14 Storage Temperature Range 2 2 Structure ITECHTEST 4 15 SUCCESS 4 21 T Tare Command TARECMD 4 12 Temperature Coefficient 2 2 Timed Out Commands 4 21 U Unpacking 3 1 Uses CalLowWeight 4 14 V volatile memory 4 13 W WAVERSAVER 1 3 2 1 Weighing System Test 1 4 Weighing System Tests 1 4 WEIGHSYSTEST 4 21 wrist strap grounding device 3 1 Write No...

Page 80: ...HI 1756 WS MANUAL Write Parameters WRITEPARAM 4 18 Z Zero Command ZEROCMD 4 12 ...

Page 81: ... how fast serial data is transmitted BIT SEC The higher the num ber the faster the data is sent between 2 devices BI DIRECTIONAL A capability used to transmit data in either direction at the same time for example to or from the instrument CAL DAY Day of the last calibration if entered CAL ID Operator ID or initials of the person doing the calibra tion if entered CAL LO WEIGHT Amount of test weight...

Page 82: ...EAD LOAD Weight of hopper assembly or platform assembly sit ting on top of load cells DECIMAL POINT POSITION Menu item used to set the decimal point position for all display readouts DISPENSER Dispensing is a Loss in Weight process The Dis penser measures the weight loss out of a vessel until a pre configured weight set point has been reached DISPLAY A device used to show information from the inst...

Page 83: ...ell parameters Example 3mV V load cell 10 volts 30mV full scale GRADUATION SIZE Minimum increment displayed by the instrument GROSS WEIGHT An overall weight exclusive of tare deductions Weight of material plus container IBC Intermediate Bulk Container INTERNET The Internet is a system of linked networks that are worldwide in scope and facilitate data communication services such as remote login fil...

Page 84: ... non linear input MOTION The amount of allowable deviation between consecu tive readings before a weighment is accepted as being complete MOTION TOLERANCE Weight parameter setting required to indicate the weight is changing on the scale and the scale is in motion The module takes the current reading and compares this reading with the reading taken a second earlier If the difference is greater that...

Page 85: ...oss Weight minus the Tare Value NON LINEARITY A deviation of an instrument response from a straight line NUMBER OF READINGS PER AVERAGE The number of weight readings used to compute the displayed weight ODD A parity configuration OPTION A device not supplied with a standard instrument OPTION SLOT A location used to install an option card PARITY A binary digit error correction appended to an array ...

Page 86: ...out of which the microprocessor can both write and read data RATE OF CHANGE ROC A measure of the rate at which weight is changing For example If 100 pounds were dispensed in 1 min ute the rate of change ROC would be 100 lb min ute REPEATABILITY The maximum difference between readings for repeated readings under identical conditions Also called reproducibility RESOLUTION Resolution is the value of ...

Page 87: ...ut the known weight of the container from the total indi cated weight so that the indicator reads net weight directly For example if you put a pallet on a scale and tare out the weight of the pallet you are weigh ing at zero The tare weight is the weight of the pallet Scale will not tare if scale is in motion TEMPERATURE COEFFICIENT the change in indication due solely to a change in tem perature f...

Page 88: ...ring with a weight reading The range of settings is to eliminate vibration at various frequen cies ZERO Weight reading once the dead load has been offset ZERO CALIBRATION Offset of the value of the dead load of the weight hop per ZERO TOLERANCE The number of graduations from zero that will be accepted as zero by the instrument ZERO TRACK ENABLE A bit that is set to allow the module to zero out any...

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