Overload Characteristics (Electronic Thermal Function); Overload Characteristics Graphs - Omron OMNUC G5 R88M-K series User Manual

3-2 Overload Characteristics (Electronic Thermal Function)

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Overload Characteristics (Electronic Thermal Function)

An overload protection function (electronic thermal) is built into the Servo Drive to protect the
drive and motor from overloading.
If an overload does occur, first eliminate the cause of the error and then wait at least 1 minute
for the motor temperature to drop before turning ON the power again.
If the alarm reset is repeated at short intervals, the motor windings may burn out.

Overload Characteristics Graphs

The following graphs show the characteristics of the load ratio and electronic thermal function's
operation time.
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When the torque command = 0, and a constant torque command is continuously applied after
3 or more times the overload time constant has elapsed, the overload time t [s] is:
t [s]  Overload time constant [s]  log
(The overload time constant [s] depends on the motor. The standard overload level is 115%.)
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Time [sec]
100
10
1
0.1
115
100 150 200
Time [sec]
100
10
1
0.1
115
100 150 200 250
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
[100 V, 200 V]
3,000-r/min motors
50 W
100 W (100 V)
100 W (200 V)
200 W
400 W
750 W
300 Torque [%]
250
[200 V]
3,000-r/min motors 1.0 kW to 5.0 kW
2,000-r/min motors
1,000-r/min motors
[400 V]
3,000-r/min motors
2,000-r/min motors
1,000-r/min motors
300 Torque [%]
(1  Overload level [%] / Torque command [%])
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