Mitsubishi Electronics FR-S500 instruction manual is set to OH, Stall prevention

Errors (Alarms)

Operation Panel Indication	GF	FR-PU04	Ground Fault
Name	Start-time output side ground fault overcurrent protection
	This function stops the inverter output if a ground fault overcurrent
Description	flows due to a ground fault which occurred on 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)
	If the external thermal relay provided for motor overheat protection
Description	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
Description	Stops the inverter output if a setting error or connection (connector)
	fault occurs during use of 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 storage device alarm
Description	A fault occurred in parameters stored
	(example: E2PROM fault).
Check point	Check for too many number of parameter write times.
Corrective action	Please contact your sales representative.

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