Milltronics Test Chain
Operating Instructions, 10/2021, A5E32310082-AB
19
Commissioning
6
Note
•
Follow the calibration details for the manufacturer's belt scale to perform a Zero
calibration.
•
Check for and adjust to an acceptable repeatability and error. Ensure the free end of the
chain has been released from the storage reel.
•
Frequency of calibration is determined by the repeatability of the span results and the
monitoring of the scale's performance.
CAUTION
Stop conveyor belt
During this step, the conveyer belt must be stopped to prevent injury to operator.
1.
Using the control station, lower the test chain onto the conveyor belt. Spread the test chain
out until it spans across the weigh idler suspension: two idlers from the approach side to
two idlers on the retreat side of the weigh suspension. (This is often referred to as the A2
approach idlers to R2 retreat idlers.) Refer to Positioning the chain (Page 17).
2.
Secure both ends of the test chain using wire rope cables attached to the eye bolts of the
frame on the storage reel and at opposite end. The test chain should lay flat on the center
roll of each idler, with the links of the chain in a horizontal position to the conveyor belt.
3.
Run conveyor at the normal operating belt speed and observe the performance of the test
chain. The rollers of the chain should run freely without incident and track centrally to the
middle of belt. No side motion or "snaking" should be observed.
4.
Continue to run the conveyor and perform the span calibration as outlined in the scale
manufacturer's manual.
Note
Snaking causes the results to be non repeatable and varying. Eliminate by readjusting the
wire rope guide cable (stays) until the problem is solved. Tension should not be applied to the
retrieving cable.
