Mitsubishi Electronics MR-J2S- CL specifications Troubleshooting, AL.31

11. TROUBLESHOOTING

Display	Name	Definition			Cause	Action
AL.31	Overspeed	Speed has exceeded	1. Input command pulse frequency			Set command pulses correctly.
		the instantaneous		exceeded the permissible
		permissible speed.		instantaneous speed frequency.
			2.	Small acceleration/deceleration		Increase acceleration/deceleration time
				time constant caused overshoot to		constant.
				be large.
			3.	Servo system is instable to cause		1. Re-set servo gain to proper value.
				overshoot.		2. If servo gain cannot be set to proper
						value:
						1) Reduce load inertia moment ratio; or
						2) Reexamine acceleration/
						deceleration time constant.
			4.	Electronic gear ratio is large		Set correctly.
				(parameters No. 4, 5)
			5.	Encoder faulty.		Change the servo motor.
AL.32	Overcurrent	Current that flew is	1. Short occurred in servo amplifier			Correct the wiring.
		higher than the		output phases U, V and W.
		permissible current	2. Transistor (IPM) of the servo			Change the servo amplifier.
		of the servo		amplifier faulty.
		amplifier.			Checking method
				Alarm (AL.32) occurs if power is
				switched on after U,V and W
				are disconnected.
			3.	Ground fault occurred in servo		Correct the wiring.
				amplifier output phases U, V and
				W.
			4.	External noise caused the		Take noise suppression measures.
				overcurrent detection circuit to
				misoperate.
AL.33	Overvoltage	Converter bus	1. Lead of built-in regenerative brake			1. Change lead.
		voltage exceeded		resistor or regenerative brake		2. Connect correctly.
		400VDC.		option is open or disconnected.
			2.	Regenerative transistor faulty.		Change servo amplifier
			3.	Wire breakage of built-in		1. For wire breakage of built-in
				regenerative brake resistor or		regenerative brake resistor, change
				regenerative brake option		servo amplifier.
						2. For wire breakage of regenerative brake
						option, change regenerative brake
						option.
			4.	Capacity of built-in regenerative		Add regenerative brake option or increase
				brake resistor or regenerative		capacity.
				brake option is insufficient.
			5.	Power supply voltage high.		Review the power supply.
AL.35	Command pulse	Input pulse	1. Pulse frequency of the manual			Change the pulse frequency to a proper
	frequency error	frequency of the		pulse generator is too high.		value.
		command pulse is	2. Noise entered the pulses of the			Take action against noise.
		too high.		manual pulse generator.
			3.	Manual pulse generator failure		Change the manual pulse generator.

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