Connection
15
4.6 Alarm Terminal Block
The device provides an alarm terminal block on the top panel for alarm output.
2-Pin 3.81mm-Spacing Plug-in Terminal Block
When connected to 24DC or 48DC power input, the device uses a 2-pin 3.81mm-spacing plug-in
terminal block for alarm. When the device works properly, the alarm relay contacts are
closed; when an alarm occurs, the alarm relay contacts are open.
Figure 19 2-Pin 3.81mm-Spacing Plug-in Terminal Block (socket)
Electrical parameters of the relay:
Max Switch Voltage: 250VAC/350VDC
Max Switch Current: 120mA
3-Pin 3.81mm-Spacing Plug-in Terminal Block
When connected to 110DC or 220AC/DC power input, the device uses a 3-pin 3.81mm-spacing
plug-in terminal block for alarm. When the switch works properly, the normally-open contacts of the
alarm relay are closed and the normally-closed contacts are open; when an alarm occurs, the
normally-open contacts are open and the normally-closed contacts are closed.
Figure 20 3-Pin 3.81mm-Spacing Plug-in Terminal Block (socket)
Note:
Pin 1 and pin 2 are normally-open contacts; pin 2 and pin 3 are normally-closed contacts. When the
switch works properly, pin 1 and pin 2 are closed, pin 2 and pin 3 are open; when an alarm occurs, pin 1
and pin 2 are open; pin 2 and pin 3 are closed.
