HDK-MT350_EN_06
61
Fault
Possible cause
Remedy
T
ech
n
ical
p
e
rs
o
n
n
e
l
S
er
vi
ce
te
c
h
n
ic
ia
n
No pressure build
up
The compressed air system
upstream of the dryer is not
pressurised.
Check whether the compressed air system
upstream of the dryer is pressurised. Remove
any faults.
V1/V2 or Y5 valve does not open
correctly.
see *
Excessive
compressed air
consumption
Condensate trap (option) on the
prefilter does not work.
Check function of the condensate trap (option), if
necessary clean or renew.
Regeneration air setting too high.
Have adjusted.
Dryer does not
switch over
Compressor might be off.
Check compressor synchronisation circuit.
Power supply interrupted, cable
broken.
Reconnect the unit to the power supply.
V1/V2 valve does not open
correctly.
see *
Error in control programme.
Restart programme.
Control board is defective.
.Check the fuses (switch cabinet, supply line)
and renew the PCB if necessary
No expansion
V3/V4 valve does not open
correctly.
see *
Insufficient operating pressure.
Increase operating pressure.
Dryer is
continuously bled
V3/V4 valve does not close
correctly.
see *
V1/V2 valve does not close
correctly.
*
Valve does not open or close correctly.
Check supply voltage.
Check that solenoid is seated correctly.
Check valves V1-V4 for contamination;
clean/replace if necessary.
Check pilot control unit Y1-Y5
Check cable voltage, contacts, solenoid; replace
defective parts if necessary.