CHINT NXZ Series User Instructions page 9

NXZ Automatic Transfer Switch
Typical application
1.Used in grid - power generation mode and may be omitted, but the
delay of generator start-up defaults to 0s.
2.Communication terminal wiring must be connected.
Normal neutral
Normal power supply
Normal closing
To fire control room
Terminals 401 and 402 can only be connected to passive signal.
If the fire control signal is active signal, the normally open contact of
relay must be connected to the controller after switching through the
relay. Terminals 403 and 404 are connected after the duplexing of fire
control. After the fire control signal being removed, the normal
operating state can be restored by pressing any key on the controller.
+ -
RS485
Figure 8 Type B controller
Connected to upper computer (RS485)
+ -
Figure 9 Typical application
07
Alternative neutral
Alternative power supply
Alternative closing
To the remote power
of generator
Used in grid - power generation mode only
and connected to the generator as needed,
or omitted. In case the normal power supply
fails,terminals 502 and 503 are connected.