Device Functions
SIRIUS 3RW44 System Manual
GWA 4NEB 535 2195-02 DS 04
6-21
The following graphic illustrates the cooling behavior with and without idle time:
Figure 6-11:Idle time
The idle time can be set between 1 and 100 s.
Caution
Risk of damage to property.
If the idle time is changed (0 = deactivated), motor protection acc. to IEC 60947
(CLASS 10A, 10, 15, 20, 30) is no longer ensured. This means that there will be
no system protection in such cases. We recommend protection action to be
taken in parallel.
Caution
Risk of damage to property.
The motor must be designed for such inching operation, otherwise the overload
may cause permanent damage.
Pre-charge time When the thermal motor model is tripped, a pre-charge time is started to let the
motor cool down and to prevent the motor from being restarted before the pre-
charge time has elapsed.
Protection against
voltage failure
If protection against voltage failure is active and the control supply voltage
breaks down while a trip is pending, the current trip condition of the thermal
motor model and the current pre-charge time are stored in the soft starter. When
the control supply voltage returns, the trip condition of the thermal motor model
before voltage failure will be restored.
Without
Tripping limit
On
t
t
t
υ
υ
Overload trip
Motor
Off
No
Tripping limit
Motor
temp. rise
Idle time Idle time
Overload trip
Idle time
With
Idle time
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