Delayed Restart - Eaton Holec Clink II User Manual

CLINK II SCU MANAGER
mains interruption time
MainsVoltageFailure
contact status
ImmediateRestartTimeout
DelayedRestartTimeout
Figure 18: Immediate restart
5.7.5

Delayed restart

If the mains voltage returns after the minimum restart timeout has elapsed, the motor speed will have
decreased so much that the electric magnetic force of the motor and the mains voltage are out of phase. Start
of motors at that moment would result in an impermissible start current surge. For that reason the motor start
is delayed. See figure 19.
restart delay time
mains interruption time
MainsVoltageFailure
MainsVoltageHealthy
contact status
ImmediateRestartTimeout
DelayedRestartTimeout
Figure 19: Delayed restart
The delay time is set using the setpoint Restart Delay Time, see table 30 on page 44. The counting of delay
time is started as soon as the mains voltage exceeds 90% of the nominal voltage. The counting is temporarily
interrupted as soon as the mains voltage drops to a level below 90% of the nominal voltage.
At delayed restart the motors are started following the normal starting procedures (see starter logic, 5.6 on
page 32).
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