Mitsumi electronic 55K, FR-F520-0.75K instruction manual Minor fault

PROTECTIVE FUNCTIONS

(2) Minor fault

When the protective function is activated, the output is not shut off. You can make parameter setting to output the light fault signal. (Set "98" in any of Pr. 190 to Pr. 195 (output terminal function selection). Refer to page 140)

Operation Panel	FN	FR-PU04	Fan Failure
Indication
Name	Fan fault
	For the inverter which contains a cooling fan, FN appears on the operation panel
Description	when the cooling fan stops due to a fault or operates differently from the setting
	of Pr. 244 "cooling fan operation selection".
Check point	Check the cooling fan for a fault.
Corrective action	Change the fan.

(3) Warnings

Operation Panel	OL		FR-PU04	OL
Indication
Name	Stall prevention (Over current)
		If a current of more than 120% (Note 5) of the rated inverter
		current flows in the motor, this function stops the increase in
	During	frequency until the overload current reduces to prevent the
	acceleration	inverter from resulting in overcurrent shut-off. When the
		overload current has reduced below 120%, this function
		increases the frequency again.
		If a current of more than 120% (Note 5) of the rated inverter
		current flows in the motor, this function lowers the frequency
Description	During constant-	until the overload current reduces to prevent overcurrent
	speed operation	shut-off. When the overload current has reduced below
		120%, this function increases the frequency up to the set
		value.
		If a current of more than 120% (Note 5) of the rated inverter
		current flows in the motor, this function stops the decrease in
	During	frequency until the overload current reduces to prevent the
	deceleration	inverter from resulting in overcurrent shut-off. When the
		overload current has reduced below 120%, this function
		decreases the frequency again.
Check point	Check the motor for use under overload.
	The acceleration/deceleration time may change. Increase the stall prevention
Corrective action	operation level with Pr. 22 "stall prevention operation level" or disable stall
	prevention with Pr. 156 "stall prevention operation selection".

Note 5: The stall prevention operation current may be set as desired. It is factory-set to 120%.

5

170