41
PROTECTIVE FUNCTIONS
Operation panel
indication
BE
Name Brake transistor alarm detection
Description
This function stops the inverter output if an alarm occurs in the brake circuit,
e.g. damaged brake transistors.
Check point
• Reduce the load inertia.
• Check that the frequency of using the brake is proper.
• Check for mis-wiring with the resistor (brake in the cable).
Corrective action
• Immediately turn off the inverter power and check the wiring.
• Change the brake unit if wiring is correct.
Operation panel
indication
OHT
Name Resistor overheat alarm
Description
When the external thermal relay provided for resistor overheat protection or
the temperature relay, etc. switches on*, inputting the contacts in the brake
unit stops brake operation.
Check point • Check for resistor overheating.
Corrective action
• Reduce the load and frequency of operation.
• Even if the relay contacts are reset automatically, the brake will not restart
unless it is reset.
Operation can be selected using Pr.2 and Pr.3 (input terminal function selection) . Set according to the
resistor unit to be connected. (Refer to page 36)
Operation panel
indication
PE
Name Parameter storage device alarm
Description Appears when an error occurred in the stored parameters. (EEPROM fault)
Check point Check for too many number of parameter write times.
Corrective action Please contact your sales representative.
Operation panel
indication
CPU
Name CPU Fault
Description Appears during the built-in CPU and peripheral circuit errors occurred.
Check point Check for devices producing excess electrical noises around the brake unit.
Corrective action
• Take measures against noises if there are devices producing excess
electrical noises around the brake unit.
• Please contact your sales representative.
CAUTION
If alarms other than the above appear, contact your sales representative.
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