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APPENDIX “E” - SCALING FOR RATE INDICATION

The Gemini offers a simplified method of scaling a rate indication display.

This unit offers the capability to monitor the entire range of any linear rate

process. Numerous programming capabilities that are available with the Gemini,

make this unit the most versatile rate indicator on the market today. The Gemini

is designed to internally count input pulses for a programmable sample time

period. At the end of the sample time period selected, the unit displays the pulses

accumulated after they have been internally multiplied by a programmable scale

factor. The unit maintains this display until it is updated by the next successive

sample time period. This is an automatic process that provides a very convenient

and adaptable method for rate indication applications.

The first step in determining the sample time and scale factor to be

programmed is to calculate the pulses per second

(PPS)

generated by the

application set-up at a known process rate. The standard formula for determining

PPS at a known process rate or machine speed is:

FORMULA [A]

Revolutions/Minute (RPM) x Pulses/Revolution (PPR) = PPS

60 Seconds

This formula is an excellent starting point, and will work in many applications;

however, applications will occur that do not fit this formula. In these cases, it will

require simple deductions to determine the correct PPS.

The next step is to choose a sample time to be programmed from those

available

(1, 2 ,5, 10, 20, and 50 seconds)

.

The following guidelines apply:

1. The sample time is also the display update time. Unless the application dictates

a longer update time

(i.e. greater precision or fewer display changes)

, the

basic rule is to start the calculation process with a one-second sample time.

2. When using the Gemini as a control mechanism, it is imperative that the update

time be shorter than the maximum allowable control reaction time. This is

another reason to begin with the one-second sample time.

APPLICATION EXAMPLE [A]

PARAMETERS AT MONITORED SPEED

A) Speed of shaft - 1200 RPM

B) Gear teeth per revolution - 50

C) Web sped at 1200 RPM - 820 FPM

D) Desired Readout - FPM

To begin the process of determining the sample time and scale factor, the

parameters from application

(A)

should be inserted into Formula

(A)

to determine

the PPS:

RPM x PPR = PPS = 1200 x 50 = 1000 PPS

60

60

The next step is to choose a scale factor, that when multiplied by 1000 will cause

a display of 820. The following formula will produce the correct scale factor:

FORMULA [B]

Desired Reading = Scale Factor

PS x Sample Time

820 = Scale Factor = 0.8200

1000 x 1

Thus, by programming a scale factor of 0.8200, the Gemini is now set to display

the correct FPM readout throughout the entire process, as it varies in speed.

A majority of the applications will be completed with a one-second sample

time. The following guidelines

(next page)

will assist in varying the sample time

and other factors, if the calculated scale factor exceeds the 5.9999 scale factor

capability of the Gemini.

1. Review the applications to ascertain if more input pulses can be generated. In all

rate indication applications, it is best to generate the highest pulse rate possible.

2. If the scale factor is calculated to be between 6.0000 and 11.9998, Function

Code 44

(number of count edges)

may be programmed [44 2], which will allow

the calculated scale factor to be divided by 2.

3. If the scale factor is over 5.9999, the sample time may be increased to a higher

level

(2,5,10,20, or 50 seconds)

. Keep in mind the update display time and the

control requirements of the application.

–49–

Содержание GEMINI 1000

Страница 1: ...THE ASTRO LINE SERIES GEMINI 1000 2000 INSTRUCTION MANUAL GEM1 2CVR QXD 4 10 02 11 04 AM Page 1...

Страница 2: ...der to adapt to different indication and control requirements The Gemini which you have purchased has the same high quality workmanship and advanced technological capabilities that have made Red Lion...

Страница 3: ...1 Codes 41 44 45 46 16 Codes 51 52 53 54 55 16 18 Codes 61 63 66 Preset Values Scale Factor 8 19 Dual Preset Rate Programming Application Example 20 21 IV 20 mA CURRENT LOOP SERIAL COMMUNICATIONS GEMI...

Страница 4: ...an open collector output s The optional Gemini plug in relay board makes it easy to field upgrade your Gemini to provide 5 amp 240 VAC relay output s The output s are also programmable and can be set...

Страница 5: ...instrument The major personality is function code 41 If it is changed from rate to counter or vice versa it may effect settings like count mode reset mode and output termination modes PROGRAMMING THE...

Страница 6: ...n immediately show the present time delay in seconds with a two decimal place accuracy The time delay values can be set from 01 to 599 99 seconds To change output 1 time delay enter function code 53 a...

Страница 7: ...ime delay and not a mode command In this case it displays a 0 10 indicating 0 10 seconds 5 4 54 3 Output 2 terminates at Reset Normal Output Phase 5 5 0000 10 0 10 second Output 2 time delay Note that...

Страница 8: ...able mode The combination of manual and remote inputs provides a high level of security without sacrificing flexibility DIAGNOSTICS SELF TEST WATCHDOG TIMER The security and integrity of the Gemini is...

Страница 9: ...ety of logic inputs and is identical to Channel A in this regard For a complete detailed description of set up see Appendix A OVERFLOW INDICATION The Gemini features an overflow indicator LED which is...

Страница 10: ...ly appear at the two inputs The Gemini unit then processes the count pulses into a string of time separated pulses so the internal counter will not lose any counts Input A serves as the add input and...

Страница 11: ...ode identifier The right most decimal point digit 1 is never turned on A sign in front of the mode identifier will inhibit leading zero blanking The absence of the sign will enable leading zero blanki...

Страница 12: ...lay if used is also reversed A sign in front of the mode identifier will provide for reverse phase operation The absence of a sign will give normal phase operation In all modes except boundary when th...

Страница 13: ...is selected the unit should be reset upon power up 54 1 TERMINATE AT OUTPUT 1 START Output 2 will terminate when Output 1 starts 54 2 TERMINATE AT OUTPUT 1 END Output 2 will terminate when Output 1 te...

Страница 14: ...ill enable the reset terminal and front panel reset button Note Front panel reset can be independently Disabled by using the disable reset DIP switch 66 1 NO FUNCTIONS ENABLED EXCEPT RESET In this mod...

Страница 15: ...t be attained by simply programming a 2 000 scale factor even though the display is reading in tenths In this case the display will increment by two for each count input Thus if an odd preset value wa...

Страница 16: ...ual Reset to Preset 2 is that when changing the total length it is only necessary to change Preset 2 length Preset 1 slow down would remain the same assuming the same amount of slow down is required T...

Страница 17: ...s sets unit personality to a counter STEP 2 Enter function code 43 Input A B Response Modes and enter a mode identifier of 2 A CNT B UP DN STEP 3 Enter function code 44 Number of Count Edges and enter...

Страница 18: ...s effectively doubles the resolution of the input signal CODE 45 SCALE MULTIPLIER There are four scale multiplier values that are available They are 1 0 1 0 01 and 0 001 They effectively divide the in...

Страница 19: ...The output is set for normal phase operation 52 6 BOUNDARY MODE When in the boundary mode the preset 1 value serves as the boundary point When the rate value is more negative than the preset the outp...

Страница 20: ...ni 2000 also has two special use function modes Terminate at Manual Reset and Terminate at Manual Reset End These modes are infrequently used However they may be useful when a requirement exists to la...

Страница 21: ...ND RESET ENABLED In this mode manual reset and the programming of the Scale Factor and Preset Values are enabled 66 1 66 2 These Modes are the same as above with the 66 3 exception that manual reset i...

Страница 22: ...of count edges could be changed to 2 and the scale factor would become 0 7938 The drive mechanism of the roll will react to a contact closure to increase or decrease speed at a set rate for the durati...

Страница 23: ...t any time or in any sequence provided the unit is already operating in a valid mode and an Operator Accessible Functions mode is not preventing this change Refer to the programming section for instru...

Страница 24: ...of the Count Value Presets and Scale Factor 2 Changing of the Presets and Scale Factor 3 Resetting of the Count Value and Outputs 4 Automatic print out when using a printer and the Print Request Term...

Страница 25: ...d string are the numerical data value 4 The last character in the command string is the command terminator This character must be sent in order to tell the Geminis that the command string is complete...

Страница 26: ...es the transmission a 400 msec delay is inserted before the transmission to keep multiple transmissions from overrunning the printer When the Print ID switch is in the down position the unit will not...

Страница 27: ...IPTIONS FOR TERMINAL BLOCK TBD 1 20 mA SRC COMMON Common for 20 mA SRC Print Request terminal 2 PRINT REQUEST The Print Request Terminal is connected to common to request the Gemini 2000 to transmit a...

Страница 28: ...n the down position the Gemini 2000 will transmit only the data value without the unit address and data ID The 400 msec delay described above will not be inserted This switch position usage is intende...

Страница 29: ...Options and Unit Address The DMPC printer has been factory set to operate with the Gemini 2000 and does not require any set up CONNECTING TO AN RLC PRINTER One or several Gemini 2000s with Serial Comm...

Страница 30: ...n offices OTHER GEMINIS OR RLC PRODUCTS WITH 20 MA CURRENT LOOP CAN BE CONNECTED IN THE SAME LOOP The drawing below shows the Current Loop set up Each Gemini 2000 is given an address and the Serial DI...

Страница 31: ...sed to initiate the transmissions from the Gemini 6 When sending commands to the Gemini the 2Ah must terminate the command NO CARRIAGE RETURNS 0Dh OR LINE FEED 0Ah CHARACTERS SHOULD BE SENT TO THE GEM...

Страница 32: ...ten the screws evenly to apply uniform compression thus providing a water tight seal CAUTION Only minimum pressure is required to seal panel Do NOT overtighten mounting screws APPENDIX A INSTALLATION...

Страница 33: ...GEMINI 1000 BLOCK DIAGRAM...

Страница 34: ...GEMINI 2000 BLOCK DIAGRAM...

Страница 35: ...otective earth 2 Shielded screened cables for Signal and Control inputs with shield drain wire connected to earth ground at the mounting panel only Multi conductor Cable Function Used For Belden 8771...

Страница 36: ...actors control relays transformers and other noisy components 5 In extremely high EMI environments the use of external EMI suppression devices suchasferritesuppressioncores iseffective InstallthemonSi...

Страница 37: ...down Refer to the Block Diagrams Relay Wiring To prolong contact life and suppress electrical noise interference due to the switching of inductive loads it is good installation practice to install a s...

Страница 38: ...to generate count input signals Since the LO FRQ mode also provides very high immunity against electrical noise pickup it is recommended that this mode also be used whenever possible with electronic s...

Страница 39: ...GEMINI 1000 CONNECTIONS CONFIGURATION SWITCH SET UPS FOR VARIOUS SENSOR OUTPUTS SEE NOTE 5...

Страница 40: ...GEMINI 2000 CONNECTIONS CONFIGURATION SWITCH SET UPS FOR VARIOUS SENSOR OUTPUTS SEE NOTE 5...

Страница 41: ...sistor for sensors with sinking outputs SRC Provides a 3 9 K pull down resistor for sensors with sourcing outputs S3 HI FRQ Removes damping capacitor and allows operation up to 10 KHz Minimum count ON...

Страница 42: ...sistor for sensors with sinking outputs SRC Provides a 3 9 K pull down resistor for sensors with sourcing outputs S3 HI FRQ Removes damping capacitor and allows operation up to 10 KHz Minimum count ON...

Страница 43: ...C They vary proportionally with sensor supply voltage 5 MAGNETIC PICKUP INPUT Sensitivity 150 mV peak nominal Hysteresis 100 mV nominal Input impedance 26 5 KW 60 Hz nominal Maximum Input Voltage 50 V...

Страница 44: ...1 IP65 Enclosure rating Face only IEC 529 Type 4 Enclosure rating Face only UL50 ELECTROMAGNETIC COMPATIBILITY Immunity to EN 50082 2 Electrostatic discharge EN 61000 4 2 Level 2 4 Kv contact 1 Level...

Страница 45: ...ta error on power up 1a Press E key b Check all function codes E ON THE DISPLAY 1 Data error detected by processor 1a Press E key b Check all function codes c Check signal lines for possible noise sou...

Страница 46: ...r noise sources 4 Wrong counting mode 4 Verify functions and modes 5 Scale factor incorrect 5 Change scale factor value UNIT WILL NOT RESET 1 Front panel reset disabled 1 Check rear panel DIP switch 2...

Страница 47: ...1 54 1 2 is programmed 1 Change 54 then program 52 2 Unit is in tachometer mode CANNOT PROGRAM CODE 54 1 2 1 52 6 is programmed 1 Change 52 then program 54 2 Unit is in tachometer mode CANNOT PROGRAM...

Страница 48: ...Input Anti Coincidence Add 5 Quadrature 6 Quadrature x4 44 NUMBER OF COUNT EDGES Cannot be programmed in Quad x4 1 1 Count on falling edge of count input 2 2 Count on both edges of count input 45 SCAL...

Страница 49: ...al Phase Output normally OFF turns ON at preset Reverse Phase Output normally ON turns OFF at preset 1 Terminate at Output 2 Start Gemini 2000 Only 2 Terminate at Output 2 End Gemini 2000 Only 3 Termi...

Страница 50: ...y 1 1 2 2 3 5 4 10 5 20 6 50 66 OPERATOR ACCESSIBLE FUNCTIONS MODES PGM DIS Terminal connected to COMM Reset Button RST Terminal Enabled Front panel reset can be independently disabled by using DIP sw...

Страница 51: ...sic rule is to start the calculation process with a one second sample time 2 When using the Gemini as a control mechanism it is imperative that the update time be shorter than the maximum allowable co...

Страница 52: ...SAMPLE TIME Desired Readout Scale 810 8 68 PPS x Sample Time Factor 93 33 x 1 In this application the 5 9999 scale factor has been exceeded To complete the requirements the calculated scale factor 8 6...

Страница 53: ...APPENDIX F GEMINI 1000 PROGRAMMING CHART CARD...

Страница 54: ...APPENDIX F GEMINI 1000 PROGRAMMING CHART CARD...

Страница 55: ...APPENDIX F GEMINI 2000 PROGRAMMING CHART CARD...

Страница 56: ...APPENDIX F GEMINI 2000 PROGRAMMING CHART CARD...

Страница 57: ...15 230 VAC GEM1 Gemini 1000 Yes No GEM10060 GEM2 Gemini 2000 Yes No GEM20060 Yes Yes GEM20160 Gemini 1000 Relay Board RLYBD000 Gemini 2000 Relay Board RLYBD002 For Information on Pricing Enclosures Ba...

Страница 58: ...This page is intentionally left blank...

Страница 59: ...st damages claims and expenses arising out of subsequent sales of RLC products or products containing components manufactured by RLC and based upon personal injuries deaths property damage lost profit...

Страница 60: ...67 6511 Fax 1 717 764 0839 Red Lion Controls BV Databankweg 6C NL 3821 AL Amersfoort Tel 31 33 472 32 25 Fax 31 33 489 37 93 Red Lion Controls France 56 Boulevard du Courcerin Batiment 21 ZI Pariest F...

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