Section 3
ZGARD C 1-Channel Controller
Installation and Setup
Alarm Relay Latch Set-up:
Normally all relays return to their inactive state once an Alarm event has cleared. The alarm relay can
be made to latch in the activated position even after all alarms have cleared. Inserting jumper H1-9 (IN)
will lock in the alarm relay so it will remain latched after all alarms clear until the reset button is pressed.
Note that the Alarm LED on the front panel will not follow this action.
Analog Output Adjustment:
The analog output (4-20mA) is factory calibrated, and should not require adjustment. It does not drift
because it is digitally controlled by the microprocessor. If adjustments are required, a ZERO and SPAN
potentiometer can be used to perform these.
To adjust the output to 4-20mA for 0-100% input (factory setting) when using a 4-20mA type sensor,
apply a 0% (4mA) signal to the input and adjust the ZERO potentiometer until the output reads 4mA.
Then apply a 100% (20mA) signal to the input and adjust the SPAN potentiometer until the output
reads 20mA.
To adjust the output to 4-20mA for 0-100% input (factory setting) when using RS485 type sensors, a 0%
and 100% input can be obtained by making sure the sensor is not exposed to any gas or ideally by
disconnecting the sensor (the Sensor Fail will then activate - ignore it) for a 0% signal, and by inserting
the 100% jumper on the back of the sensor board for a 100% signal.
3.4
H1
PARAMETER
SETUP
1
2
3
RELAY NORMALLY EN/DE (IN/ OUT)
4
DISPLAY RANGE B/A (IN/ OUT)
5
DELAY 5MIN. / POT (IN/ OUT)
6
HORN SOLID / VAR (IN / OUT)
7
WARNING POT / 35% (IN / OUT)
8
ALARM POT / 50% (IN / OUT)
9
ALARM LATCH (IN)