Installation and operating instructions, ATS021
1SDH000759R0002, L4106
22
6. Connecting
6. Connecting
Only an authorised electrician may perform the electrical installation and maintenance
of automatic transfer switches. Do not attempt any installation or maintenance actions
when an automatic transfer switch is connected to the electrical mains. Before starting
work, make sure that the circuit breaker is de-energised.
6.1 Power circuit
Operating voltage, setting with DIP-switches
Main voltage:
208Vac - 480Vac (± 20%)
Phase voltage:
120Vac - 277Vac (± 20%)
Frequency:
50Hz - 60Hz (± 10%)
Phase setting with
DIP
switches: Single phase or Three-phase
(default)
.
If the automatic transfer switch ATS021 is used without neutral (three-phase connection), the external
transformer must be used. The transformer will drop the main voltage to the phase voltage level. Neutral
has to be connected when using a single phase connection.
Figure 6.1
The external transformer must be used, if the automatic transfer switch ATS021 is used
without neutral (three-phase connection). Neutral has to be connected when using a
single phase connection.
