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

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.
3-2-1

Overload Characteristics Graphs

The following graphs show the characteristics of the load ratio and electronic thermal function's
operation time.
Time [s]
100
10
1
0.1
115
100 150
Time [s]
100
10
1
0.1
115
100 150 200
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%.)
G5-series AC Servomotors and Servo Drives User's Manual (with Built-in EtherCAT Communications)
[100 V, 200 V]
3,000-r/min Servomotors
300 Torque [%]
200 250
[200 V]
3,000-r/min Servomotors 1.0 kW to 5 kW
2,000-r/min Servomotors
1.500-r/min Servomotors
1,000-r/min Servomotors
[400 V]
3,000-r/min Servomotors
2,000-r/min Servomotors
1.500-r/min Servomotors
1,000-r/min Servomotors
250 300 Torque [%]
(1 − Overload level [%] / Torque command [%])
e
50 W
100 W (100 V)
100 W (200 V)
200 W
400 W
750 W
3 Specifications
2
3-35
3