Identify and eliminate faults
HDK-CNG_EN_03_2016
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Identify and eliminate faults
Stop condition of dryer
In stop condition, the main valves on the dryer are open. When the main
valves are open, the dryer is permeated with humid natural gas. This can
cause damage to dryer and drying agent.
In stop condition, ensure that gas supply is stopped, or that dryer is
turned off at the mains isolator switch.
There are different fault types. With most electrical faults (e.g. short circuit,
defective fuse etc.), the main valves close. Faults on the dryer (or 'adsorber')
become noticeable e.g., due to unusual noises and dam pressures.
The fault message is shown in the display until the fault has been remedied and
then acknowledged. To acknowledge a fault, acknowledge each one individually
using the relevant keystrokes.
Note:
A fault (alarm) is shown on the Alarm menu display with date and
time.
Summary of faults
In the case of some process faults, the dryer will continue to operate for some
time.
Table of possible faults
Fault
Possible cause
Remedy
D
ry
e
r
s
tops
fault heater
Motors protection switch QA 1 has
triggered.
Replace heating.
Temperature limiter A 2 triggers.
Reset temperature limiter by pressing the
Acknowledge Fault key
pre alarm heater Temperature limiter A 2 triggers.
Heating temperature is higher than planned.
fault fan
(option)
high power consumption on
regeneration gas cooler QA3
Check and if necessary replace the regeneration
gas cooler
Motor temperature of regeneration gas
cooler too high
Check and if necessary replace motor function.
fault valve Y1-Y7 Solenoid coil defective
Replace fuse and solenoid coil and/or valve.
fault PT100 sense Sensor defective
Replace sensor.
Cable defective
Replace cable.
