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3-2 Overload Characteristics (Electronic Thermal Function)
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
3
Specifications
3-2 Overload Characteristics (Electronic Thermal Function)
An overload protection function (electronic thermal) is built into the driver to protect the driver
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.
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] will be:
t [s]
= −
Overload time constant [s]
×
log
e
(1
−
Overload level [%] / Torque command [%])
2
(The overload time constant [s] depends on the motor. The standard overload level is 115%.)
100
0.1
1
10
100
150 200 250 300 Torque [%]
115
Time [sec]
50 W
100 W (100 V)
100 W (200 V)
200 W
400 W
750 W
3,000-r/min motors
[100 V, 200 V]
100
115
0.1
1
10
100
150 200 250 300 Torque [%]
Time [sec]
[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