helm model ptm-1 strain gage i/o module
Contents
1. 04 21 08 THIS DRAWING AS WELL AS THE SUBJECT MATTER THEREON SCALE FULL Analog Track Output Calibrate AZ Off AZ On Hi Lo Gain Switch Gage green Gage black Signal red Shield Signal white 24VDC Supply IN EXTERNAL DRY CONTACT CAM SWITCH Analog Peak Output Gain Power Light Balance EXTERNAL 2 WIRE PLC OUTPUT PROX PROBE CAM INPUT 0 VDC ie 24V PLC PLC OUTPUT COMMON DRAWN BY M H L ev M H L HELM INSTRUMENT CO INC MAUMEE OHIO USA IS EXCLUSIVE PROPERTY OF HELM INSTRUMENT CO INC IT IS TO BE TREATED BY YOU AS CONFIDENTIAL PROPRIETARY INFORMATION THE DRAWING OR SUBJECT MATTER THEREOF SHALL NO BE DUPLICATED OR DISCLOSED WITHOUT THE EXPRRESS WRITTEN CONSENT OF HELM INSTRUMENT CO INC oat 09 17 04 _ R J G mme 1 PEAK TRACK MODULE SPECIFICATIONS amp WIRING HELM E1096WO3C approveo ey R J G DRAWING NUMBER TIMING DIAGRAM STAMPING TRACK OUT SIGNAL 0 4V DC SEE NOTES 1 amp 2 CAM SIGNAL 24V DC STOP PEAK STOP PEAK LOOK WINDOW LOOK WINDOW PEAK OUT SIGNAL 0 4V DC NOTES 1 PEAK VALUE SHOULD BE CAPTURED ON FALLING EDGE OF CAM SIGNAL REV DESCRIPTION BY DATE 2 THIS IS TYPICALLY DONE WITH A FALLING COMMAND IN THE PLC 1 ADD TIMING NOTATIONS MAHL 02 22 11 THIS DRAWING AS WELL AS THE SUBJECT MATTER THEREON SCALE NONE pesicneo2. HELM Helm Instrument Company Inc 361 West Dussel Drive Maumee Ohio 43537 USA 419 893 4356 Fax 419 893 1371 www helminstrument com HELM MODEL 1 STRAIN GAGE I O MODULE User Manual Revised 4 7 08 Force Measurement and Control Solutions HELM MODEL PTM 1 STRAIN GAGE MODULE INSTALLATION OPERATING INSTRUCTIONS The following provides installation and operating instructions for the Helm Model PTM 1 Strain Gage I O Module when used with a full bridge strain gage sensor or load cell 1 General Description The Helm Model PTM 1 Strain Gage I O Module is shown in Helm drawing E1096i01 It is a compact 1 channel strain gage signal conditioning module for use with Full Bridge strain gage load cells and sensors The internal circuitry includes signal filtering amplification calibration auto zero and peak hold functions Inputs include full bridge strain gage sensor excitation and signal connections plus 24 VDC power and external timing Outputs include a scaled track and peak 0 10 VDC analog voltage signal The module allows for ease of installation and stable load cell signal output in industrial applications As the drawing shows the plastic housing for the module is configured for DIN rail mounting 2 Module Mounting The Model PTM 1 Module should be snapped securely into a DIN mounting rail inside an electrical panel The module should be located so that it is physically isolated no closer than 1
3. IN F N praw M H L IS EXCLUSIVE PROPERTY OF HELM INSTRUMENT CO INC HELM IT IS TO BE TREATED BY YOU AS CONFIDENTIAL PROPRIETARY 5 29 97 N F N approven BY R J G INFORMATION THE DRAWING OR SUBJECT MATTER THEREOF SHALL NO BE DUPLICATED OR DISCLOSED WITHOUT THE me TYPICAL TIMING DIAGRAM STAMPING HELM Wu cap tise EXPRRESS WRITTEN CONSENT OF HELM INSTRUMENT CO INC 309711
4. This can be used with HT 400 Strain Gain sensors in press load monitoring applications where high deflection and signal output is present It should also be used with load cells having mid range output approx 0 50 1 00 mV V or having high output greater than 1 00 mV V For some applications such as the case with a pre calibrated load cell the proper Calibration Number is known in advance Typically such a value is expressed in percent i e for example 50 at 140K shunt cal resistance at rated capacity For this load cell which was calibrated at a shunt cal resistance of 140K the High Low Gain Toggle Switch should be set to the lower LOW GAIN 140K position In order to enter such a percent Calibration Number first convert it from percent to voltage This is done by multiplying the percent value times the Helm standard of 2 667 volts Track Output at 100 full scale For this example that would be 50 x 2 667 V 1 333V The Gain pot should then properly be adjusted so that the voltmeter reads 1 333V In that condition and with the module running in normal mode the Track Output and Peak Output sensor signals will be scaled at 2 667 V 100 full scale If a different analog voltage output scaling is desired the Gain pot can simply be adjusted up or down to achieve the proper full scale output value up to a maximum of 10 VDC It should be noted that the Calibration Number for a load cell is always based on a partic
5. signal output scaling can be adjusted to any value up to 10 VDC 100 full scale by means of the Gain pot HELM Model PTM 1 Peak track Strain Gage I O Module 0 0 0 0 0 1 UPDATE DRAWING TO SHOW 04 21 08 NEW HIGH LOW GAIN SWITCH THIS DRAWING AS WELL AS THE SUBJECT MATTER THEREON SCALE FULL M H L DRAWN BY M H L IS EXCLUSIVE PROPERTY OF HELM INSTRUMENT CO INC IT IS TO BE TREATED BY YOU AS CONFIDENTIAL PROPRIETARY oat 09 17 04 owe R J G aprovo ev HELM INFORMATION THE DRAWING OR DISCLOSES WITHOUT THE me 1 PEAK TRACK STRAIN GAGE 1 0 MODULE DIMENSIONS HELM INSTRUMENT CO INC MAUMEE OHIO USA EXPRRESS WRITTEN CONSENT OF HELM INSTRUMENT CO INC De _ _ y 1 E1096i01A HELM Model PTM I Peak Track Module SPECIFICATIONS Power Input Power Consumption Full Bridge Strain Gage 175 700 Ohm 0 10 VDC 0 10 VDC 1 Full Scale Accuracy 50dB at 2000 Gain Signal Output Track Signal Output Peak Input Impedance Normal Mode Rejection between 1 4 Input Amplifier Roll Off Frequency 650 Hz at 3000 Gain Manual Adjustment 0 C 60 C 32 F 140 F Calibration Operating Temperature Hazardous Environmental Classification Class 1 Div 2 Hazardous Environment 4 Condutor Shielded HELM Stock No 25198 Recommended Cable Mounting Configuration REV DESCRIPTION BY DATE UPDATE WITH NEW Hi Lo GAIN SWITCH
6. Look Window for each machine cycle to be monitored Three main types of external timing input signals can be used including dry contact prox probe or PLC output Wiring connections for the particular timing input device are made at the 3 Cam screw terminals at the bottom of the module OUTPUTS 0 10 VDC Signal Output Track and Peak The module signal output connections are made at the 3 screw terminals at the top For 0 10 VDC analog voltage Track output use the Track and Acom connections This provides an instantaneous output voltage signal scaled to the sensor input For 0 10 VDC analog voltage Peak output use the Peak and Acom connections This provides a peak output voltage signal for each cycle that is scaled to the sensor input Based on the external timing function for each machine cycle the peak signal value is held in memory at the end of each cycle and then reset to zero at the start of each new cycle These output connections typically go to a PLC or similar device where the conditioned sensor or load cell output signal can be used to drive an operator display or meter to show actual calibrated tonnage If desired by the user High Low Alarm functions can be programmed at the PLC 4 Initial Set Up and Calibration Zero Balance After the proper wiring connections are made the module should be set up by connecting a good quality voltmeter to the 0 10 VDC analog voltage
7. Track output terminals Track and There should be no load on the sensor and the external timing input signal should be off between cycles Set the small 3 position calibration toggle switch at the top of the module to the center Off position Adjust the small Balance pot below the switch so that the voltmeter reads 0 00 volts This electronically zero balances the sensor or load cell to the module circuit HELM MODEL PTM 1 STRAIN GAGE I O MODULE INSTALLATION OPERATING INSTRUCTIONS Calibration With the voltmeter still connected to the module move the small 3 postion calibration toggle switch to the upper Cal Calibration position The voltmeter will now show the Shunt Calibration Number as a voltage based on the setting of the High Low Gain Toggle Switch on the front of the module There are two available calibration resistor values listed below depending upon the application and how much gain signal amplification factor is needed The voltage Calibration Number can be adjusted up or down if needed by turning the small Gain pot above the switch The two available calibration resistor values available for the PTM 1 module are HIGH GAIN 1 MEGOHM CAL RESISTOR UPPER SWITCH POSITION This is for use typically with HT 400 Strain Gain sensors or other sensor types where the deflection and signal output is low LOW GAIN 140K OHM CAL RESISTOR LOWER SWITCH POSTION
8. foot from AC power lines relays or motors This is to prevent the possible bad effects of electromagnetic noise generated by such devices The module should be located close to a power supply of 24 VDC and also close enough to the sensor or load cell to make proper wiring connections 3 Electrical Wiring and Module Specifications Electrical wiring connections and specifications for the module are shown in Helm drawing E1096w03 The various connections are very simple and are outlined below INPUTS 24 VDC Power Input 24 VDC power input is connected at the 3 screw terminals at the bottom of the module Strain Gage Sensor Input The strain gage sensor wires are connected at the orange 5 pole Weidmuller connector at the bottom of the module Connections include Gage Signal and Shield For ease of wiring at the connector it can be removed from the module while making the 5 connections at the screw terminals HELM MODEL PTM 1 STRAIN GAGE I O MODULE INSTALLATION OPERATING INSTRUCTIONS Please note that for a Helm compression load cell excluding LC Series calibration load cells the Gage Green and Gage Black connections should be reversed from those shown on the drawing This is in keeping with the Helm load cell wiring convention and allows for positive output in compression External Timing Input Peak Look Window The PTM 1 module requires a 24 VDC external timing input Peak
9. iming signal a Peak Reset function happens to reset the previous peak value and to start the Peak Capture for the new machine cycle HELM MODEL PTM 1 STRAIN GAGE I O MODULE INSTALLATION OPERATING INSTRUCTIONS 5 Normal Operation After the set up and calibration have been completed the 3 position calibration toggle switch should be set to the lower A Z Auto Zero position for normal operation This allows the Auto Zero Balance function to operate between active load cycles maintaining a proper zero reference for accurate signal output values As the machine is cycled and load is placed on the sensor or load cell the module will generate scaled Track Output and Peak Output analog DC voltage signals The Track Output is simply the instantaneous signal output from the sensor and is always on The Peak Output is controlled by the external timing signal with a Peak Capture function and is the overall peak signal output from the sensor for a current cycle It is held in memory at the end of each timing signal Peak Look Window and reset to zero by a Peak Reset function at the start of the next timing signal for the new cycle In terms of signal output scaling the Helm standard is 2 667 VDC 100 full scale capacity Load values between no load and 100 capacity will yield a proportional output signal between the particular minimum and maximum output points As stated above if desired the
10. sired Track Output and Peak Output scaled values to drive the display meter If there is not enough gain with the toggle switch at the tower LOW GAIN 140K position move it to the upper HIGH GAIN 1 Megohm position The corresponding voltage Calibration Number can be read on the voltmeter with the 3 postion calibration toggle switch in the Cal position When the Zero Balance and Calibration procedures are completed the toggle switch should be set to the lower A Z Auto Zero position for normal operation External Peak Look Window Timing As stated above an external timing signal input Peak Look Window is required for each machine cycle to be monitored This 24 VDC signal can be generated by a dry contact prox probe or PLC output In general the timing signal should start shortly before the forming load begins for the new cycle and should end shortly after the forming load is finished In effect the timing signal tells the module when to look at the forming signal for each cycle and to capture the Peak load value within that time frame This occurs when the timing signal is On When the timing signal is Off and provided that the toggle switch is set to the lower A Z Auto Zero position the Auto Zero Balance function is turned on to maintain a proper zero balance reference Auto Zero is turned off when the timing signal is on and load is occurring At the start of each new t
11. ular shunt cal resistance value For a Helm load cell calibrated at a 140K shunt cal resistance the percent Calibration Number can be directly converted to the voltage value per above example with the PTM 1 module set to the LOW GAIN 140K position If the load cell was calibrated at a shunt cal resistance that does not match either of the High Low Gain Toggle Switch settings LOW GAIN 140K or HIGH GAIN 1 Megohm another conversion to the percent calibration number must be done This is shown below Example Load Cell Cal Number 50 56 2K Shunt Cal Resistance PTM 1 Module Cal Resistor Value lower LOW GAIN switch position 140K LOW GAIN NEW LC Cal Number Orig Cal Num Orig Shunt Cal Resistance New Shunt Cal Resistance NEW LC Cal Number 50 56 2K 1 40K 20 07 140K Shunt Cal Resistance LOW GAIN PTM 1 Voltage Cal 20 07 2 667V 535 V For this example the voltage Cal value of 0 535V should be entered with the module set to LOW GAIN 140K For other applications such as the case with bolt on strain gage sensors Helm Model HT 400 Strain Gain the proper Calibration Number may not necessarily be known in advance For that case the machine to which the sensors are mounted should be field calibrated using portable calibration load cells and instrumentation to verify the actual developed tonnages During that procedure the Gain pot on the module should be adjusted as needed to achieve the de
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