GE C11, AF-300 manual List of protective functions, List of Protective Functions

6 Protective Function

6-1 List of protective functions

When the protective function is activated, drive output is instantly cut off (while the motor coasts until it is stopped), and an alarm is issued, and the details of the alarm are displayed on the keypad panel.

		Table 6-1-1 List of Protective Functions
	Keypad
Alarm Name	panel dis-		Contents of operation
	play
Overcurrent	OC1	During acceleration	If the drive output current momentarily exceeds the over-
	OC2	During deceleration	current detection level because of an overcurrent in the
	OC3	While running at	motor or the short-circuit in the output circuit, the output is
		constant speed
			shut down, an alarm is issued, and the drive is tripped.
Overvoltage		During acceleration	If the DC voltage of the main circuit exceeds the overvolt-
	OU1		age detection level because of an increase in the regenerat-
			ing current from the motor, etc., output is shut down, an
	OU2	During deceleration	alarm is issued, and the drive is tripped. However, protec-
			tion against inadvertent overvoltage loading (e.g., high-
			voltage line) might not be provided.
	OU3	While running at
		constant speed
Undervoltage	LU	If the DC voltage of the main circuit falls below the undervoltage detection level
		because of a lowered power supply, output is shut down to protect the drive. If the
		restart function after momentary power failure is not activated, an alarm is issued
		and the drive is tripped.
		If the restart function is activated, the drive restarts automatically with no alarm.
		For further details of the protective function, refer to the descriptions of Function
		F14.
Overheating of	OH1	If the temperature of the heat sink used for cooling the rectifier diodes and IGBTs
heat sink
		rises because of cooling fan failure, etc., protective function is activated to stop
		operation, an alarm is issued, and the drive is tripped.
External Alarm	OH2	If the control circuit terminal THR (functional change of X1 to X3 terminals) is
		set to OFF, an alarm is issued and the drive is tripped.
	OL	If the motor current exceeds the operating level set by the electronic thermal O/L
Motor overload		relay, output is shut down to protect the motor, an alarm is issued, and the drive is
		tripped.
Drive overload	OLU	If the output current exceeds the drive rated overload current, output is shut down,
		an alarm is issued, and the drive is tripped.

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