Installation and Operation Guide | DGS Modbus
© Danfoss | ADAP-KOOL® | 2016.12
22 | RS8HJ102 |
9. Troubleshooting
Symptom
Possible Cause(s)
Green and Red light off
• Check power supply. Check
wiring.
• DGS Modbus was possibly
damaged in transit. Check
by installing another DGS
Modbus to confirm the fault.
Red light on, green led off
(indicates a 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 CO2. Do a zero-
adjustment with a zero-gas
and a re-calibration.
Alarms in the absence of a leak • If you experience alarms in
the absence of a leak, try
setting an alarm delay.
• Perform a bump test to
ensure proper operation.
The zero-measurement drifts
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.
When changing potenti-
ometer P1, the test point
measurement is changing but
the active alarm point is not
changing
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).
