Deif PPM 300 - Relay Output Wiring

6.4.2 Relay output wiring
This relay has three terminals: normally closed, common and normally open (changeover relay). You can connect wiring to all three
terminals. Alternatively, you can connect wiring to only the common and normally open terminals, or only the common and normally
closed terminals.
For example, you can connect equipment to the normally closed terminal and the common. The following diagram shows an
example of a relay output where the normally open relay terminal is connected to a 230 V AC contactor. For this example, the
terminal connections can be swapped around without affecting the performance.
230 V AC
0 V AC
Contactor
A1
A2
Similarly, you can connect equipment to the normally closed terminal and the common.
You can also connect equipment to both the normally open and the normally closed terminals, as shown in the following diagram.
For this configuration, current will flow through the equipment connected to the normally closed terminal when the relay is de-
energised. The current will flow through the equipment connected to the normally open terminal when the relay is energised.
230 V AC
0 V AC
Contactor
A1
A2
Contactor
A1
A2
INFO
For 230 V AC contactors, DEIF strongly recommends that you use an RC snubber for noise suppression across the
contactor.
INSTALLATION INSTRUCTIONS 4189340909I UK Page 65 of 144