IBC control F21037401, Manual, Page: 10 / 16

Rotation monitor
Probable fault cause on
installation
Probable fault cause in
operation
Alarms and trips unless a pulse is received every 5 minutes.
- Magnet facing the wrong way
- Magnetic sensor incorrectly connected (wrong polarity),
see CONNECTIONS on page 10
- Too wide a gap between the magnetic sensor and magnet; max 15 mm
- Broken belt
- Belt slipping
- Stuck wheel
- Magnetic sensor or magnet not intact
Motor temperature
Probable fault cause
Alarms and trips if motor winding temperature is too high.
The thermal contact in the motor reverts to normal mode when the
temperature drops.
See "Overcurrent" on page 9.
Overvoltage
Alarms and trips if the power supply exceeds 276 V for more than
4-5 seconds
.
Undervoltage
Alarms and trips if the power supply falls below 195 V for more than
4-5 seconds.
Short circuit/overcurrent
Undervoltage and over-
voltage both light up
Probable fault cause
Alarms and trips in the event of a phase-to-phase or phase-to-earth short
circuit and overcurrent.
Phase-to-phase short circuit
MicroMax370 limits current to 4 A, above which it will trip after
4-5 seconds.
- Motor winding fault
Measure motor resistance; it should be identical on all phases.
- Phase-to-phase short circuit in the cable
ALARMS
All alarms remain in state.
Continued on next page
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