User Instructions
1
AWZ518
v1.1
PC2
Timing relay module
Edition: 4 from 01.03.2018
Supersedes: 3 from 11.02.2014
1. Description.
The PC2 timing relay module is intended for AC power status control in object alarm systems (monitoring
transmitters, alarm control panels, DC power supply units, etc.). The module informs about AC power loss with a preset
delay time T and its return. Momentary return of the AC power during the T delay countdown will reset the countdown
(stop and return to normal state). The module is equipped with an AC1 input which shall be connected to one of the
secondary winding of the transformer that supplies the device (the module must be powered with 12V/DC of the device to
which the controlled terminal of the transformer is connected). PC2 has two OC outputs (OC1, OC2) and an LED (L1)
indicating the device’s status. Delay time indicating AC power loss is adjustable via two jumpers – Z1, Z2.
Fig.1. A diagram of the PC2 connection (example).
2. Description of components and connectors of the module.
Nr
[rys.2]
Description
[1]
L1 green LED - module’s status indication
permanently illuminated: presence of AC power at AC1 terminal,
presence of VDC power of the module
twinkles 1x/1s: no AC power at AC1 terminal, delay time countdown
off: the module has finished the countdown and changed the status of OC outputs
(alternatively - no 12V DC power)
[2]
Z1, Z2 jumpers - adjustable time delay of AC power failure indication
Z1= , Z2= time delay T= 4s
Z1= , Z2= time delay T= 1 min
Z1= , Z2= time delay T= 16 min
Z1= , Z2= time delay T= 4h 15 min
jumper on
jumper off
[3]
Connectors
AC1 – input of controlled AC voltage (one of terminals of the transformer’s secondary winding)
+VDC- DC power input
OC1 - OC output (open collector) indicating AC power status:
normal state: L (0V, GND),
active state: hi-Z (high impedance)
OC2 - OC output (open collector) indicating AC power status:
normal state: hi-Z (high impedance)
active state: L (0V, GND) OC type
Normal state: AC voltage presents at the AC1 terminal or after AC power loss
Active state: no AC voltage at the AC1 terminal, delay time countdown is finished
EN*