MITSUBISHI ELECTRIC FR-S520 - Manual (Page 149)

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Operation Panel Indication GF FR-PU04 Ground Fault
Name Start-time 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. Made valid when Pr. 40 "start-time ground fault
detection selection" = "1".
Check point Check for a ground fault in the motor and connection cable.
Corrective action Remedy the ground fault portion.
Operation Panel Indication OHT FR-PU04 OH Fault
Name External thermal relay (*2)
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. 60 to Pr. 63 (input terminal function selection).
Corrective action Reduce the load and operating duty.
*2. Functions only when any of Pr. 60 to Pr. 63 (input terminal function selection) is
set to OH.
Operation Panel Indication OLT FR-PU04 Stll Prev STP
Name Stall prevention (overload)
Description
The running frequency has fallen to 0 by stall prevention
operation activated. OL appears while stall prevention is being
activated.
Check point Check the motor for use under overload.
Corrective action Reduce the load weight.
Operation Panel Indication OPT FR-PU04 Option Fault
Name Communication error (*3)
Description
Stops the inverter output if a setting error or connection
(connector) fault occurs during use of the RS-485 communication
function.
Check point Check that the connector is plugged securely.
Corrective action
Make connection securely.
Please contact your sales representative.
Operation Panel Indication PE FR-PU04 Corrupt Memory
Name Parameter error
Description
A fault occurred in parameters stored
(example: E
2
PROM fault).
Check point Check for too many number of parameter write times.
Corrective action Please contact your sales representative.