Why won't my Hardy Instrument read C2®?

If your Hardy Instrument cannot read the C2® data from the load cells it is normally due to a wiring problem or noise on the C2® line. If you have another unit that correctly reads the data in the same location, then we can rule out a wiring problem.

One unit reading the data and another not reading it can be caused by the difference in tolerances between components that makes one unit a little more susceptible to the noise than the other. Noise on the line can be caused by:

Insufficient grounding - Verify the cable shield is grounded to a good earth ground on one end only. Verify the ground it is connected to is actually at ground potential. The system should have a single point ground. If there are multiple paths to ground, this can cause a ground loop that can induce noise to the line. 

Verify that you are using Hardy C2® cable. Other cable may not have the same characteristics of our cable, (see attached) so may have problems reading the C2® data. Also, verify that you are using the Gray & Violet wires within our cable for the C2® connections. 

Verify the load cell C2® cable is routed away from all high voltage cables, as this can cause noise on the line also. 

Verify the load cell wiring is plugged in before power is applied to the unit. Your Hardy Instrument reads the C2® data at power up. If you plug in the load cell wiring when your instrument is already on it will not read the C2® data.

To troubleshoot this problem:
1. Try hooking a single load cell up directly to the module and see if it reads the C2®.
2. Try placing a 2200pfd capacitor between +C2 and -C2 connections at the summing box.
3. As with any electronics, the module may have a fault and may need to be returned to the factory for evaluation.