Power Connections - Unitek Classic Q1 Series Manual

Electrical
installation
4.5

Power connections

Direct power connection:
The power connections must be protected by
means of fast acting fuses.
The power choke inductance must be >200H.
The phases of the power connection and the auxiliary
voltage must be equal.
There is an internal watchdog for the power connection.
If the power supply or the fuses fail, the device switches off
and the BTB contact opens.
4-8 Q1-Netz-direkt-1
Power connection via an auto-transformer:
Usually an auto-transformer is used.
The transformer performance is determined by the
permanent current and the secondary voltage.
Fast acting fuses F must be installed between the
transformer and the control unit.
4-9 Q1-Netz-Spartrafo-1
The fuses are monitored concerning failure via the mains monitoring system.
The phases of the transformer voltage and the auxiliary voltage must be equal.
The contactor contacts before the transformer must be rated according to the starting current of
the transformer.
Protect the transformer by means of slow fuses.
Important:
For transformer secondary voltages < 230 V~ the
resistors R2 and R3 of the power section must be
adapted in the factory
.
Specification on order: Transformer voltage
Operation with a 60Hz current supply:
When operating with a mains frequency of 60Hz the
contacts 1 and 2 of the DIP-switch S3 must be set to ON.
Classic Q1 14