BEWATOR COTAG 4101-2, Руководство по установке, Страница: 65 / 158

4253 Input/Output module 16/8 & 4953 I/O Status Display module
7-5
Outputs
The 4253 I/O module provides eight outputs supplied on single pole
changeover relays. Each relay has just two connections, O# and C#
(where # is the output number). These connections can be
individually set to either normally open or normally closed using
jumpers JU1 to JU8 on the module circuit board.
All relays are electrically isolated from each other and from everything
else. Each relay can be connected to a power supply of maximum
30V AC or DC passing a maximum current of 2A.
Using a relay to switch inductive DC loads
If you are using a relay to switch an inductive DC load, such as a
mag lock, we recommend that you fit a suppression diode across the
load as shown in the following diagram.
Mag lock
Power supply
NO
NC
Com
- +
If you don’t do this, the relay may wear out quickly due to arcing
across the contacts. Use a diode such as IN4001 and make sure you
connect it so it is
not conducting when the lock is energised .
Setting up the 4253 I/O module
Inputs
Jumpers JU13 to JU16 set the polarity of each of the first four even
address inputs, I1 to I4. Jumpers JU17 to JU18 set the polarity of
each of the first four odd address inputs, I1 to I4. A jumper in the
NORMALLY CLOSED position means the module expects the switch
or relay contact driving the corresponding input to be normally closed
- opening the switch or relay connected to the input activates the
input. SW1 in the NORMALLY OPEN position means the module
expects the switch or relay contact driving the corresponding input to
be normally open - closing the switch or relay connected to the input
activates the input.
The polarity of the other eight inputs, I5 to I8 even and I5 to I8 odd,
is fixed to NC (switch contacts normally closed).