Westermo SDI-8xx - Manual (Page 3)

Wiring the Power Inputs
1. Insert the positive and negative wires into the
V+ and V- contact on the terminal block connector.
2. Tighten the wire-clamp screws to prevent the DC
wires from being loosened. See Figure-2
Notes: The recommended working voltage is DC12V/24V/48V (DC10~60V, 0.8A).
The relay output alarm contacts are in the middle
of the terminal block connector as shown in figure 3.
By inserting the wires and set the DIP switch of the
respective Alarm to “ON”, relay output alarm will
detect any port failures, and form a short circuit.
The alarm relay output is “Normal Open”. See, Figure -3.
Wiring the Earth Ground
In an industrial environment, there might be
a lot of devices that generate electromagnetic
noise, such as AC motors, electric welding
machine, power generator. These devices will
generate electric noise or surges that might
disturb communications. To prevent those noises,
the switch should be well grounded.
Figure 4 shows how proper wiring should be made.
Wiring the Relay Output
Maximum 1A current / DC 24V
Figure-3
Alarm
System
Extra Power
System
Earth Ground
Screw
Earth Ground
Warning: Do not connect to AC line neutral
Figure-4
Figure-2
DC1 DC2 Alarm
A B
Alarm control
1 2 3 4 5 6
Port Power
7 8
DC1 DC2 Alarm
A B
Alarm control
1 2 3 4 5 6
Port Power
7 8
SDI-880 / SDI-862
SDI-880 / SDI-862