GDS 404+ Series, Руководство по эксплуатации

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15
Fig. 7
TECHNICAL
Input voltage 12~30v DC – 24v nominal
Output Standard Analogue 4~20 mA (250 ohms max) – source
Option 1~5v output – solder G
CV–Sensor Cable 2 core screened
Alarm relay board options 3 wire system only (2 wire if the 4~20mA signal is not used)
(safe area board only) Signal relay contacts S.P.C.O. rated 1A/24v
Mains relay S.P.C.O. 3A/230v AC
Trip Indicator LED – trip point selectable 10% to full scale
Fire Alarm panel signalling – cut F
Logic output – JP3 position L and end of line link JP4
Full board On board sounder
(safe area board only) Auxiliary output DC volts – standard–as input volts 24v
DPM – gas readout display – (zero and span potentiometers used only for DPM setting)
Installation
For hazardous area equipment see specific instructions supplied with the
equipment, or visit our website for technical information. Siting of the
equipment should be chosen with regard to the following points:
1. Away from sources of heat and with room for adequate air circulation.
2. Within easy reach for operating and maintenance personnel.
3. Connecting cables to be electrically shielded, i.e. M.I.C.C., steel wire
armoured, screened cable or steel conduit.
4. For sensor location see our website.a
Note: Sensor cables should not be run in the same ducting as power cables.
Calibration
1. Connect a digital voltmeter (miIIivolt range) to the + and – test
terminals (2 wire system) or X and Y test terminals (3 wire system).
For 3 wire systems the CV is preset in the current source mode.
2. In clean air check that the DVM reads 4mV, if not adjust the 4mA
potentiometer on the CV transmitter board.
3. Apply test gas and wait until a maximum DVM reading is obtained,
if necessary adjust the 20mA potentiometer for the required mV
reading for the calibration gas used (see range/reading on test
certificate or printed on the CV circuit board).
4. For oxygen level monitoring remove the sensor terminal connector
from the PCB J4 or yellow wire and adjust the 4mA potentiometer for
4mA (4mV).
5. Where a digital panel meter is fitted to the CV card the reading may
be adjusted by the DPM Zero potentiometer.
Reconnect the cell and allow reading to stabilise adjust the DVM
reading for 17.3mA (20.8% ambient oxygen) using the 20mA
potentiometer. Where a Digital panel meter is fitted the display may be
adjusted by using the DPM S potentiometer (span).
Additional Relay Board Alarm Trip Point Adjustment
This level will normally be set at 20% of the range reading i.e. 7.2mA.
1. Connect the DVM as above, using the 4mA potentiometer adjust for
the required trip level.
2. Adjust the alarm level potentiometer until the alarm LED just comes
on.
3. Using the 4mA potentiometer re–adjust the DVM to 4mV.
The above adjustment may be carried out in house by connecting the
CV transmitter directly to a DC power supply.
Should a full board be required to operate on a 2 wire loop then the
relay must be disabled – remove JP2
Gas Type Programming – Works/preset
CO, H2S, SO2, NH3, H2 remove R4, R6, R10, R15, R28, R29,
HCN
remove R4, R6, R8, R10, R15, R28, R29,
NO2, CL2 O3, remove R4, R7, R10, R11, R28, R29
NO, HCL, C2H4O remove R3, R4, R6, R10, R12, R15, R28, R29,
O2 remove R3, R8, R6, R15, R42, R43, IC–U2
CV TRANSMITTER
TOXIC/OXYGEN
Technical Sheet
ref C323Fv2
30J 30J 30J
A
B
C
D
X
P
-
-
+
-
+
+
Y W
P Y W
SENSOR
FIELD TERMINALS
TO GDS
ALARM PANEL
PCN149
E
Y
20mA
4mA
TP2 TP4
TP1
RV3
JP1
RV4
TP3
C-V
TRANSMITTER
2 Wire
Loop
Powered
3 Wire
Sink
3 Wire
Source
BMS
MONITOR
JPI Jumpers AD
JPI Jumpers DB
JPI Jumpers AC
-
+
E
SIG
-
+
-
+
E
SIG
-
SIG
+
+
-
+
E
SIG
SAFE AREA BOARD Exd BOARD
24v DC
Output
W Y P
No C Nc
NC
C
NO
- +
+
Sensor
Terminal
Sounder
RELAY
BOARD
Sensor
Terminal
EOL
Output Signal
Adjust
Test Points
Alarm Level
Adjust
Alarm
LED
JP2
20m
A
4m
A
Span Zero DP
M
E
A
JP1
- +
W Y R
- +
J4
JP3
JP4
X Y
B
C
D
W+
Y
SIG
P -
Field Terminals
to GDS Alarm Unit
U5
LK1
A L
T
1A
Relay
RL2
3A
Relay
RL1
-