Mitsubishi Electronics MR-J2S- CL Characteristics, Overload protection characteristics

13.CHARACTERISTICS

13.CHARACTERISTICS

13.1 Overload protection characteristics

An electronic thermal relay is built in the servo amplifier to protect the servo motor and servo amplifier from overloads. Overload 1 alarm (AL.50) occurs if overload operation performed is above the electronic thermal relay protection curve shown in any of Figs 13.1. Overload 2 alarm (AL.51) occurs if the maximum current flew continuously for several seconds due to machine collision, etc. Use the equipment on the left-hand side area of the continuous or broken line in the graph.

In a machine like the one for vertical lift application where unbalanced torque will be produced, it is recommended to use the machine so that the unbalanced torque is 70% or less of the rated torque.

1000								1000
						During rotation
100								100
time[s]	10		During stop					time [s]	10
Operation								Operation
	1								1
	0.1								0.1
	0	50	100	150	200	250	300		0
			(Note) Load ratio [%]

				During rotation
	During stop
50	100	150	200	250	300

(Note) Load ratio [%]

		a. MR-J2S-10CL to MR-J2S-100CL								b. MR-J2S-200CL to MR-J2S-350CL
10000
	1000
time[s]						During		rotation
		During servo lock
Operation	100
	10
	1
	0	50	100	150	200		250		300

(Note) Load ratio [%]

c. MR-J2S-500CL MR-J2S-700CL

Note: If the servo motor is stopped or low-speed (30r/min or less) operation is performed at an abnormally high duty with torque more than 100% of the rating being generated, the servo amplifier may fail even in a status where the electronic thermal relay protection is not activated.

Fig 13.1 Electronic thermal relay protection characteristics

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