User guide

TrueFeed manual
40
9. Troubleshooting
Problem: The feeder does not come into specification or a maximum deviation alarm is activated.
Possible causes:
1. Ensure that all cables are connected correctly.
2. Ensure that the transport protection pin is removed from the load cell safety bolt.
3. Ensure that the hopper assembly is fixed tightly to the weighing platform and that the throat adaptor is fixed tightly
to the production machine.
4. Ensure that the dispensing cylinder is tightly fixed to the motor shaft.
5. Excessive build-up of material on the dispensing cylinder may have affected proper feeding.
To avoid this, be sure that the seals and dispensing cylinder are clean.
6. Ensure to remove any tension on the cables connected to the weighing platform.
7. Use the weight check function with the reference weight to determine the correct function of the weighing system.
8. If the weight check gives the correct result, ensure that the material flow into the cylinder has not been blocked.
9. Another cause may be an obstruction to the weighing system. Ensure that there is at least ≈ 0.04 in {1mm} space
between all the pointed screws on the load cell frame or platform and that there is no material or dirt blocking the
movement.
10. In case of a water-cooled throat adaptor, ensure there is no material build up around the dispensing cylinder and
the water-cooled pipe that can obstruct the free movement of the weighing system.
11. Ensure that the input signal is stable.
12. If none of the above causes the problem, recalibrate the system and attempt the weight check again.
Problem: The feeder does come into specification but seems to be slow.
Possible causes:
1. Extreme vibrations and shocks to the system.
2. Extremely low setpoint. See Chapter 8, SYSTEM PERFORMANCE for more information.
3. Ensure that the automatic hopper hoses are connected properly.
Problem: The input/start-signal is connected but the unit does not recognize the start signal.
Possible causes:
1. Ensure that the correct wires are connected for potential free contact, potential contact or tachometer. Also check
if the (+) and (–) sides of the wiring are connected correctly.
[See chapter 6.5, 7.4 and Appendix B for the Wiring diagram.]
2. The earlier series control does need a different wiring diagram than the one printed in this manual. The wiring
diagram for main boards with the code MVC000BA02 (this code is printed on the main board) can be sent by
Conair on request.
3. Automatic fuse is activated, this can happen when there was a short-circuit at the input connection. To deactivate
the automatic fuse, the control needs to be turned OFF for a period of time and ON again. Check and repair any
short-circuits before cycling the feeder’s power.
Problem: The hopper weight is not stable.
Possible causes:
1. Ensure that the weighing signal is not influenced by external circumstances, for example that the load cell cable
passes near to electromagnetic fields or electro motors.
2. Extreme vibrations and shocks to the system.
3. Ensure that there is no obstruction to the weighing frame.
4. Ensure that the automatic hopper hoses are connected properly.