Section 4
ZGARD C 4-Channel Controller
Installation and Setup
On the main circuit of every ZGARD C
Controller is a series of user configurable
components for setting, adjustment and
selecting the required functionality and
operation of the instrument.
Refer to the
associated controller, Installation
Outline Drawing, 106957 for further
details.
Display Mode:
The ZGARD C 4-Channel controller can accept up to 4, 4-20mA or RS485 input signals depending on
the type of remote gas sensors employed. If the incoming signals are 4-20mA analog type, then the
controller must be configured to reflect the actual operating range of the incumbent remote gas
sensors.
There are two display mode options, A and B and is selected by placing Jumper H2 in the required
position. If jumper H1-4 is OUT, Range A is selected. If jumper H1-4 is IN, then Range B is selected.
After the display mode is chosen the operating range must be selected. This option is chosen using
Jumper H2 with various jumper positions for the different display operating ranges.
*
Range A 10.0/100 is a special Display Range that displays the first two channels (1 & 2) as 0-
10.0ppm and the second two channels (3 & 4) as 0-100ppm. This is useful for Carbon Monoxide (CO) /
Nitrogen Dioxide (NO2) applications.
Remote RS485 Digital Sensor Inputs:
The number of active remote sensors is set by arranging the user selection jumpers shown on H1-1 and
H1-2. Care must be taken to represent the number of remote sensors connected for each application.
Insert the jumpers such that the decimal equivalent of the binary code on H1-1 and H1-2 plus one
equals the number of active sensors to be scanned.
Connect a 4-conductor serial bus electrical cable between the devices. The connection terminal labeled
Data 1 and Data 2 are for communication while the +24Vdc and COM are for power, supplied by the
ZGARD C controller.
Refer to the associated controller, Installation Outline Drawing 106957 for
further details.
4.1
H2
RANGE A
H2-2 H2-1
RANGE
B
H2-2 H2-1
1
999
OUT
OUT
500
OUT
OUT
2
100 OUT IN
200 OUT IN
10.0 IN OUT 75 IN
OUT
* 10.0/100
IN
IN
50
IN
IN
H1
PARAMETER
SETUP
1
1
Number of Active Points
2
2
1 + (0 -3 )
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)