Electrical installation
31
04/2019 - V01
DS 400.2
Pr
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4.8
Pre-charging
Inrush current
With the first switching-on the inrush current is internally limited to a 10-fold rated current value
(approx. 2 ms) by means of a NTC resistor.
The effect persists when between switching off and switching on again a waiting time interval of
180s is adhered to. The NTC resistor is placed in the cooling air flow of the device ventilator.
Note:
Always check the switching capacity K1
Fast switching off/on
If the switch off-on sequence is fast the inrush current may rise to a 30-fold higher value (1ms)
Attention:
The drive contactor K1 and the input rectifier may be damaged.
A pre-charging unit must be installed.
Pre-charging with inrush limiter
The charging current is limited to < 10 A by means of the UNITEK Inrush Limiter. The power
contactor K1 is switched on after a delay time.
Attention
:
The drive contactor must not be switched
under load.
Switching on-off only when the enable is blocked.
No voltage applying across FRG/RUN (X1:7).
