Minebea Intec PR 6246/12, Руководство по установке

Страница: 23 / 74

8 Troubleshooting
8.1 General Notes
The following hints will enable a technician to do an initial diagnostic or help in case of
incorrect or non-reproducible weighing results after commissioning and calibration.
8.2 Visual inspection
Component Possible errors
Weighing object Are all pipes, hoses and cables free from shunt forces?
Are the connections pliable and connected horizontally?
Are elements with a solid connection to the scale in direct contact with the surroun-
dings?
Has friction developed between the weighing object and its surroundings (e.g. dus-
ty openings, …)?
Cable junction box Has moisture intruded?
Do all soldering and screw connections have secure contact?
Connecting cables Is the sheath damaged?
Has moisture intruded?
Mounting kit Are the constrainers stuck?
Load cell Is the adjustment chamber cover damaged?
Is the sheath of the load cell cable damaged?
Has moisture penetrated into the load cell cable?
8.3 Metrological controls
8.3.1 Checking the zero output signal of the load cell
- Unload load cell.
- Disconnect the load cell measuring outputs.
- Check whether the output voltage without load is within the limits.
Type Output voltage
D1, C3, C6 0 ±0.02 mV/V
8.3.2 Checking the strain gauge bridge of the load cell
- Do not exceed the test voltage.
- Check whether the values of the resistors are within the permissible limits.
Max. test voltage
-
Standard version U
DC
= 28 V
- Intrinsically safe version (PR …/..E) U
DC
= 25 V
8 Troubleshooting Tension S-type load cell PR 6246
Minebea Intec EN-21