PROTECTIVE FUNCTIONS
166
Operation Panel Indication
E. BE
FR-PU04
Br. Cct. Fault (Note)
Name
Brake transistor alarm detection (Note 2)
Description
If a brake transistor fault occurs due to excessively large
regenerative energy from the motor, for example, that fault is
detected to stop the inverter output. In this case, the inverter
power must be switched off immediately.
Check point
Check for improper braking duty.
Corrective action
Change the inverter.
Please contact your sales representative.
Note: 2 This function is activated only when the optional brake resistor is connected.
Operation Panel Indication
E. GF
FR-PU04
Ground Fault
Name
Output side ground fault overcurrent protection
Description
This function stops the inverter output if a ground fault
overcurrent flows due to a ground fault which occurred in the
inverter's output (load) side.
Check point
Check for a ground fault in the motor and connection cable.
Corrective action
Remedy the ground fault portion.
Operation Panel Indication
E. OHT
FR-PU04
OH Fault
Name
External thermal relay operation (Note 3)
Description
If the external thermal relay designed for motor overheat
protection or the internally mounted temperature relay in the
motor switches on (contacts open), the inverter output is
stopped. If the relay contacts are reset automatically, the
inverter will not restart unless it is reset.
Check point
•
Check for motor overheating.
•
Check that the value of 7 (OH signal) is set correctly in any
of Pr. 180 to Pr. 183 (input terminal function selection).
Corrective action
Reduce the load and operating duty.
Note:3 This function is activated only when OH has been set to any of Pr. 180 to
Pr. 183 (input terminal function selection).
Operation Panel Indication
E. OLT
FR-PU04
Stll Prev STP
Name
Stall prevention
Description
The running frequency has fallen to 0 by stall prevention
activated. (OL while stall prevention is being activated.)
Check point
Check the motor for use under overload.
Corrective action
Reduce the load weight.
5