Mitsubishi Electronics MR-J2S- CL specifications Troubleshooting, 11, AL.50

11. TROUBLESHOOTING

Display	Name	Definition			Cause		Action
AL.50	Overload 1	Load exceeded	1. Servo amplifier is used in excess of			1.	Reduce load.
		overload protection		its continuous output current.		2.	Review operation pattern.
		characteristic of				3.	Use servo motor that provides larger
		servo amplifier.					output.
			2. Servo system is instable and			1.	Repeat acceleration/
				hunting.			deceleration to execute auto tuning.
						2.	Change auto tuning response setting.
						3.	Set auto tuning to OFF and make gain
							adjustment manually.
			3. Machine struck something.			1.	Review operation pattern.
						2.	Install limit switches.
			4. Wrong connection of servo motor.			Connect correctly.
				Servo amplifier's output terminals
				U, V, W do not match servo motor's
				input terminals U, V, W.
			5. Encoder faulty.			Change the servo motor.
					Checking method
				When the servo motor shaft is
				rotated with the servo off, the
				cumulative feedback pulses do
				not vary in proportion to the
				rotary angle of the shaft but the
				indication skips or returns midway.
AL.51	Overload 2	Machine collision or	1. Machine struck something.			1.	Review operation pattern.
		the like caused max.				2.	Install limit switches.
		output current to	2. Wrong connection of servo motor.			Connect correctly.
		flow successively for		Servo amplifier's output terminals
		several seconds.		U, V, W do not match servo motor's
		Servo motor locked:		input terminals U, V, W.
		1s or more	3. Servo system is instable and			1.	Repeat acceleration/deceleration to
		During rotation: 2.5s		hunting.			execute auto tuning.
		or more
						2.	Change auto tuning response setting.
						3.	Set auto tuning to OFF and make gain
							adjustment manually.
			4. Encoder faulty.			Change the servo motor.
					Checking method
				When the servo motor shaft is
				rotated with the servo off, the
				cumulative feedback pulses do
				not vary in proportion to the
				rotary angle of the shaft but the
				indication skips or returns midway.
AL.52	Error excessive	The droop pulse	1. Acceleration/deceleration time			Increase the acceleration/deceleration
		value of the		constant is too small.		time constant.
		deviation counter	2. Internal torque limit 1 (parameter			Increase the torque limit value.
		exceeded 2.5		No.28) is too small.
		rotations.	3. Motor cannot be started due to			1.	Review the power supply capacity.
				torque shortage caused by power		2.	Use servo motor which provides larger
				supply voltage drop.			output.
			4. Position control gain 1 (parameter			Increase set value and adjust to ensure
				No.7) value is small.		proper operation.
			5. Servo motor shaft was rotated by			1.	When torque is limited, increase the
				external force.			limit value.
						2.	Reduce load.
						3.	Use servo motor that provides larger
							output.
			6. Machine struck something.			1.	Review operation pattern.
						2.	Install limit switches.
			7. Encoder faulty			Change the servo motor.
			8. Wrong connection of servo motor.			Connect correctly.
				Servo amplifier's output terminals
				U, V, W do not match servo
				motor's input terminals U, V, W.

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