PROTECTIVE FUNCTIONS
143
FR-PU04 Indication
Inv. Overload
Name
Inverter overload shut-off (electronic overcurrent protection)
(Note 1)
Description
If a current of more than 150% of the rated output current
flows and overcurrent shut-off does not occur (200% or less),
inverse-time characteristics cause the electronic overcurrent
protection to be activated to stop the inverter output in order
to protect the output transistors.
Check point
Check the motor for use under overload.
Corrective action
Reduce the load weight.
Note:1 Resetting the inverter initializes the internal heat integrating data of the
electronic overcurrent protection.
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.
5
To Next Page
Loading...
