Overload Characteristics (Electronic Thermal Function); Overload Characteristics Graphs - Omron R88M-K Series User Manual

3-2 Overload Characteristics (Electronic Thermal Function)

3-2 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 error 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
3
operation time.
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%.)
3-31
Time [s]
100
10
1
0.1
115
100 150 200
Time [s]
100
10
1
0.1
115
100 150 200
OMNUC G5-series AC Servomotors and Servo Drives User's Manual (with Built-in EtherCAT Communications)
[100 V, 200 V]
3,000-r/min Servomotors
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 Servomotors 1.0 kW to 1.5 kW
2,000-r/min Servomotors
1,000-r/min Servomotors
[400 V]
3,000-r/min Servomotors
2,000-r/min Servomotors
1,000-r/min Servomotors
250 300 Torque [%]
(1 − Overload level [%] / Torque command [%])
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