Troubleshooting - Danfoss DGS-SC Installation And Operation Manual

Type dgs-sc and dgs-ir with modbus gas sensor
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Installation and Operation Guide | DGS Modbus

9. Troubleshooting

Symptom
Green and Red light off
Red light on, green led off
(indicates a fault)
Alarms in the absence of a leak • If you experience alarms in
The zero-measurement drifts
When changing potenti-
ometer P1, the test point
measurement is changing but
the active alarm point is not
changing
22 | RS8HJ102 |
Possible Cause(s)
• Check power supply. Check
wiring.
• DGS Modbus was possibly
damaged in transit. Check
by installing another DGS
Modbus to confirm the fault.
• Sensor may be disconnected
from printed circuit board.
Check to see sensor is
properly inserted into board.
• The sensor has been
damaged or has reached the
end of life and needs to be
exchanged. Contact Danfoss
for instructions and support
• The zero-adjustment has
been reduced to achieve
a zero-measurement in
an environment with gas,
typically CO 2 . Do a zero-
adjustment with a zero-gas
and a re-calibration.
the absence of a leak, try
setting an alarm delay.
• Perform a bump test to
ensure proper operation.
The DGS-SC sensor technology
is sensitive to the environment
(temperature, moist, cleaning
agents, gas' from trucks, etc).
All ppm measurements below
75ppm should be disregarded,
i.e. no zero-adjustment made.
Any alarm limit configured via
Modbus takes priority over
the setpoint set electrically
via potentiometer P1. To
re-enable the setpoint
adjustment via P1, set the
Modbus parameter to '0'
(zero).
© Danfoss | ADAP-KOOL® | 2016.12

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