Manning GM-JR-F Gas Monitoring Alarm System 19186 GMJRF 10/2006 REVC Copyright © 2006 Honeywell Analytics. All Rights Reserved. 10
3
Operation
continued
D
Troubleshooting
Risk of electrical shock.
The unit will indicate a fault if the signal is less than
14 mV between
TP1
and
TP2
(see Figure 4, Note 1).
A signal greater than 20 mA (200 mV) must be
considered a high gas concentration.
Some Manning sensors are configured to send a
signal of 0.5 mA if a sensor fault exists. If the voltage
between
TP1
and
TP2
= 5 mV, this indicates a properly
wired sensor is in a fault condition. Proceed to
investigate the sensor.
If the voltage between
TP1
and
TP2
= 0.0 V, this
indicates no signal current is flowing. Check
monitoring equipment connections and configuration.
Input impedance must be 250 ohms or less.
The relay has a green LED in series with its coil
(see Figure 4, Note 2). If this LED is on, this indicates
that the relay is energized and contacts will be in the
normal position. If this LED is off, the contacts will be in
the tripped condition.
Power supply voltage should be checked at +24 on
the control unit input terminal block (see Figure 4,
Note 3). The voltage should be 15—24 VDC.
The Manning GM-JR and the connected sensor are
powered from the same supply. The supply must be
capable of supplying 300 mA at 24 VDC for the
Manning GM-JR in addition to the sensor current
requirement (see sensor manual).
The setpoint shorting tab must be installed (see
Figure 4, Note 4). If it is removed, the unit will go into
an alarm condition after the 10 second delay.
If questions arise, call Honeywell Analytics.
E
Maintenance
The Manning GM-JR is designed for long life and high
reliability. Honeywell Analytics recommends checking
signal voltages monthly and logging them.
Additionally, the sensor being monitored should be
exposed to the target gas on a monthly basis while all
alarm functions are verified at the Manning GM-JR.
This will test the sensor and any equipment connected
to the relays in addition to the Manning GM-JR.
F
Replacement
Parts
For replacement parts, contact Honeywell Analytics.
Be sure to give serial number and model number of
unit.
Figure 4: Troubleshooting the Manning GM-JR Gas Monitoring Alarm System
SHLD GND
+24
SIG
SHLD GND
+24
SIG
TO SENSOR
TO CONTROL UNIT
JR-BACK
+24
SIG IN
SIG OUT
GND
+24
SIG IN
SIG OUT
GND
100%
95%
90%
85%
80%
75%
70%
65%
60%
55%
50%
45%
40%
35%
30%
25%
20%
15%
10%
SETPOINT
BOT
TOP
SIG
TB1
GND
NC COM NO
J1
TP2
F1
D1
SIGNAL TEST
40-200 mVDC
TP1
JP2
JP1
JP3
40-200 mV
Black
-
Red
+
mVDC
15-24 VDC
Black
-
Red
+
VDC
Note 4:
If setpoint shorting
tab is not installed, unit will
be in alarm condition
Note 2:
Green LED lighted
indicates relay is in normal
position
Note 1:
Checking
signal 40-200 mV
Note 3:
Checking
24 VDC power supply
to input terminal blocks
Note:
If the GM-JR is mounted in
the sensor enclosure, the display
board will be connected directly into
the sensor pre-amp. See sensor
manual for further troubleshooting.
Risk of electrical shock.
