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PROTECTIVE FUNCTIONS
130
FR-PU04 Indication
H/Sink O/Temp
Name
Fin overheat
Description
If the cooling fin overheats, the overheat sensor is actuated to stop
the inverter output.
Check point
•
Check for too high ambient temperature.
•
Check for cooling fin clogging.
Corrective action
Set the ambient temperature to within the specifications.
FR-PU04 Indication
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.
FR-PU04 Indication
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. Use Pr. 249 "ground fault detection at start" to set
whether the protective function is to be activated or not.
Check point
Check for a ground fault in the motor and connection cable.
Corrective action
Remedy the ground fault portion.
FR-PU04 Indication
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
Pr. 183 "MRS terminal (MRS) function selection".
Corrective action
Reduce the load and operating duty.
Note:3 This function is activated only when OH has been set for Pr. 183 "MRS
terminal (MRS) function selection".
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