Electrical connection
6.7 External control voltage
Installation and Operating Instructions SINAMICS G180
Operating Instructions, 02/2019, 4BS0751-007
103
6.7
External control voltage
6.7.1
Use of external control voltage
The inverter generates the control voltage from the DC link voltage in normal operation.
Use external control voltage in the following cases:
●
For main contactor on the line voltage side
●
If the display should also function when no line voltage is present
●
If the inverter should restart operation approx. 3 s faster than without external control
voltage in the case of momentary mains power failures. The initialization time of approx. 3
s does not apply in the case of external supply.
6.7.2
Connecting the external 230 V AC control voltage
6.7.2.1
Protecting/fusing the external 230 V AC control voltage
WARNING
External control voltage without fuse protection
If you use an external control voltage without suitable protection (e.g. fuses), then
overloads and short-circuits can occur. This can result in death, serious injury or material
damage.
The device may only be operated with a protected external control voltage. Note the
following recommendation.
Install one of the following options to protect the external control voltage:
●
Miniature fuse in accordance with EN 60127: 2 A … 6 A, slow, maximum 150 VA
●
Miniature circuit-breaker: 2 A … 6 A, characteristic D, maximum 150 VA
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