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
Overtemperature motor
Probable fault cause
Alarms and trips if motor winding temperature is too high.
e thermal contact in the motor reverts to normal mode when the
temperature drops.
See "Overcurrent" on page 9.
Overvoltage Alarms and trips if the connection voltage exceeds 276 V
for more than 4-5 seconds.
Undervoltage Alarms and trips if the connection voltage falls below 195 V
for more than 4-5 seconds.
Short circuit/overcurrent
Probable fault cause
Alarms and trips in the event of a phase-to-phase or phase-to-earth
short circuit and overcurrent.
Short circuit phase-phase orphase-earth (earth fault)
MicroMax370 trips immediately.
- Motor winding fault
Measure motor resistance, it should be identical on all phases.
- Short circuit between phases in the cable
- Earth fault in motor or cable
ALARMS
All alarms remain in state.
Continued on next page
8
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