Section 5
ZGARD C Controllers
Start-Up Procedure
When wiring, checking or working within a ZGARD C Controller, always disconnect the main
power to prevent bodily harm.
1. Loosen the locking screws on front of the controller and open the door.
2. Locate the power switch on main circuit board inside controller enclosure.
3. Check all wiring connections are correct and secure.
4. Confirm that the selection jumpers are appropriately inserted to reflect binary code for the number of
remote sensors associated with the corresponding controller.
5. Confirm that each controller’s active 4-20mA remote sensor(s) are appropriately wired to the appropriate
analog input terminals.
OR
Confirm that each controller’s active RS485 digital remote sensor(s) are
appropriately assigned a unique binary address code.
Refer to the appropriate gas sensor manual
for further details.
6. Power up the controller and observe the behavior of the following indicators;
Green LED (POWER) Indicator on front panel should be ON.
(On the 1-Channel Controllers only)
Green LED (Sensor OK) Indicator(s) on front panel should be ON.
Amber LED (WARNING) Indicator(s) on front panel should be OFF.
Red LED (ALARM) Indicator(s) on front panel should be OFF.
During initial power up of the controller, the local audible alarm may be activated, press RESET button
to silence.
7.
Allow the associated remote gas sensors to stabilize.
Refer to the appropriate gas sensor manual for
further details.
Depending on the controller’s warning, alarm and delay settings, the display status and the relay action
of the controller may vary. Refer to the installation sections of the associated ZGARD C Controller.
8. Confirm the functionality of the controller and that is operating according to the designed or pre-set
configuration settings.
9. Apply a representative sample (at least 60% of the operating range) of the target gas to each of the
associated remote gas sensors. This simple test should drive the gas sensors upscale and simulate a
warning and or an alarm condition on the controller.
Refer to the appropriate gas sensor manual for
further details.
During this procedure, the audible device may be activated, press RESET button to silence.
The warning and alarm indicators and the corresponding relays may be activated.
Depending on the controller’s warning and alarm set-points and delay feature settings, the Warning and
Alarm relays may be activated.
Any remote equipment, which may be connected to the controller relay contacts, should now be
activated.
10. Remove any test equipment from the sensor and controller.
11. Secure the locking screws on the front door of the ZGARD C Controller.
12. Secure the locking screws on cover or front door of the associated remote gas sensors.
9
The initial function test of the ZGARD C Controller is now completed.
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