Rice Lake Coil Scale RoughDeck CS - Manual (Page 12)

22 RoughDeck HE AutoLift
5.0 Troubleshooting
If the system powers up and gives some type of stable digital readout that varies with the load on the system, any
system problems are probably caused by factors other than the load cells. The load cells are often blamed for a
malfunctioning system, but the majority of the time, the problem lies elsewhere. Look for mechanical causes for
your problem first.
If the system can be calibrated but doesn't return to zero, loses calibration, or demonstrates non-linearity or
non-repeatability, see the following chart for possible causes and do the following checks.
Table 5-1. Troubleshooting
Symptom Possible Cause
No return to zero Mechanical binding or debris in seals or under load cells; may have lost system calibration.
Non-linearity Thermal expansion or deflection under load causing binding or side load.
Non-repeatability Loose load cell mount; drifting caused by moisture, load cell overload or shock damage;
mechanical binding.
Lost calibration Out of level or plumb; moisture problem; mechanical binding.
Drifting readout Moisture in junction box, cables, or load cell; mechanical binding.
1. Check load cell mount for debris restricting load cell movement or debris between scale and structure.
2. Check that tank/vessel and mounts are plumb, level, and square at the critical areas.
3. Check all piping and conduit for connections that restrict movement.
4. If check rods are used, loosen all connections to finger tight only for testing.
5. Check load cell cables for physical or water damage.
If after all these checks the problem still cannot be isolated, reconnect all but one load cell. Replace the load cell
with a load cell simulator. Alternate so that each load cell is individually disconnected and replaced with a
simulator. If there is a problem with a particular load cell, the symptom should disappear when that load cell is
disconnected and replaced with the simulator.