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12. CHARACTERISTICS
12. CHARACTERISTICS
12.1 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 (AL.50) occurs if overload operation performed is above the electronic thermal relay
protection curve shown in any of Figs 12.1, Overload 2 (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
www.DataSheet4U.com
100
10
1
0.1
0
a. MR-E-10A-QW003 to MR-E-100A-QW003
Note. If operation that generates torque more than 100% of the rating is performed with an abnormally high frequency in a servo motor stop
status (servo lock status) or in a 30r/min or less low-speed operation status, the servo amplifier may fail even when the electronic
thermal relay protection is not activated.
12.2 Power supply equipment capacity and generated loss
(1) Amount of heat generated by the servo amplifier
Table 12.1 indicates servo amplifiers' power supply capacities and losses generated under rated load. For
thermal design of an enclosure, use the values in Table 12.1 in consideration for the worst operating
conditions. The actual amount of generated heat will be intermediate between values at rated torque and
zero torque according to the duty used during operation. When the servo motor is run at less than the
maximum speed, the power supply capacity will be smaller than the value in the table, but the servo
amplifier's generated heat will not change.
Table 12.1 Power supply capacity and generated heat per servo amplifier at rated output
MR-E-10A-QW003
MR-E-20A-QW003
MR-E-40A-QW003
MR-E-70A-QW003
MR-E-100A-QW003
MR-E-200A-QW003
Note 1. Note that the power supply capacity will vary according to the power supply impedance. This value assumes that the power factor
improving reactor is not used.
2. Heat generated during regeneration is not included in the servo amplifier-generated heat. To calculate heat generated by the
regenerative option, refer to section 13.1.1.
During rotation
During servo lock
150
50
100
200
(Note) Load ratio [%]
Fig 12.1 Electronic thermal relay protection characteristics
Servo amplifier
Servo motor
HF-KE13W1-S100
HF-KE23W1-S100
HF-KE43W1-S100
HF-SE52JW1-S100
HF-KE73W1-S100
HF-SE102JW1-S100
HF-SE152JW1-S100
HF-SE202JW1-S100
1000
100
10
1
0.1
0
250
300
(Note 1)
Power supply
Servo amplifier-generated heat [W]
capacity [kVA]
At rated torque
0.3
0.5
0.9
1.0
1.3
1.7
2.5
3.5
12 - 1
During rotation
During servo lock
150
50
100
200
(Note) Load ratio [%]
b. MR-E-200A-QW003
(Note 2)
With servo off
25
15
25
15
35
15
40
15
50
15
50
15
90
20
90
20
250
300
Area required for
heat dissipation
2
[m
]
0.5
0.5
0.7
0.8
1.0
1.0
1.8
1.8
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