Transducer / Load Cell and Cable Testing

How to determine if a cable or transducer is faulty.

Model C, Model F, Model UPB, Model SUPB, Model RS (3 Pin)

To verify load cell integrity, unplug the transducer cable at the controller/indicator and use an ohm-meter to measure the resistance at the connector on the cable. Measure between pins A,B, and A,C. In each case, the resistance should be about 100 ohms (100 ohms nominal w/Std excitation, 200 ohms nominal w/XR excitation). Measure the resistance between any pin and the outside of the connector. The meter should read infinite resistance.

Apply a force to the roll by hand or by using a rope and a weight, in the direction of the tension force and maintain it while again measuring between pins A,B and A,C. The resistance should be only a few ohms different from before. If you see any incorrect readings, disconnect the cable from the transducer and repeat the checks at the connector on the transducer.

 

Pair of Pins Standard Excitation (5 VDC) Extended Range (10 VDC)
Pin A (white) to Pin B (black) 100 ohms 200 ohms
Pin A (white) to Pin C (red) 100 ohms 200 ohms
Pin B (black) to Pin C (red) 200 ohms 400 ohms
Any Pin to Body of connector Infinite Infinite

Model NW, Model RFA, Model TR, Model VNW (6 Pin)

To verify load cell integrity, unplug the transducer cable at the controller/indicator and use an ohm-meter to measure the resistance at the connector on the cable. Measure between pins A,B, and A,C. Also measure between pins D,E and D,F. In each case the resistance should be about 100 ohms (100 ohms nominal w/Std excitation, 200 ohms nominal w/XR excitation). Measure the resistance between any pin and the outside of connector. The meter should read infinite resistance. Apply a force to the roll by hand or by using a rope and a weight, in the direction of the tension force and maintain it while again measuring between pins A,B and A,C. Repeat while measuring between pins D,E and D,F. The resistance should be only a few ohms different from before.  If you see any incorrect readings, disconnect the cable from the transducer and repeat the checks at the connector on the transducer.

  VNW Transducers
Pair of Pins Standard Excitation (5 VDC) Extended Range (10 VDC)
Pin A (white) to Pin B (black) 100 ohms 200 ohms
Pin A (white) to Pin C (red) 100 ohms 200 ohms
Pin D (green) to Pin E (blue) 100 ohms 200 ohms
Pin D (green) to Pin F (brown) 100 ohms 200 ohms
Pin B (black) to Pin C (red) 200 ohms 400 ohms
Pin E (blue) to Pin F (brown) 200 ohms 400 ohms
Any Pin to Body of Connector Infinite Infinite

Model LT (6 Pin)

To verify load cell integrity, unplug the transducer cable at the controller/indicator and use an ohm-meter to measure the resistance at the connector on the cable. Measure between pins A,B, and A,C. Also measure between pins D,E and D,F. In each case the resistance should be about 800 ohms (800 ohms nominal). Measure the resistance between any pin and the outside of the connector. The meter should read infinite resistance. Apply a force to the roll by hand or by using a rope and a weight, in the direction of the tension force and maintain it while again measuring between pins A,B and A,C. Repeat while measuring between pins D,E and D,F. The resistance should be only a few ohms different from before.  If you see any incorrect readings, disconnect the cable from the transducer and repeat the checks at the connector on the transducer.

 
Pair of Pins Resistance  
Pin A (white) to Pin B (black) 800 ohms  
Pin A (white) to Pin C (red) 800 ohms  
Pin D (green) to Pin E (blue) 800 ohms  
Pin D (green) to Pin F (brown) 800 ohms  
Pin B (black) to Pin C (red) 1600 ohms  
Pin E (blue) to Pin F (brown) 1600 ohms  
Any Pin to Body of Connector Infinite  

Cable Testing

To check wire continuity in cables, connector sockets and associated wire colors are listed below.

Connector Socket Letter
Wire Color
 
Socket A White  
Socket B Black  
Socket C Red  
Socket D Green  
Socket E Blue  
Socket F Brown  

Request Info

Anticipated Response Time: Within 2 Hours