DK50 3x4VR/M
NP-DK50-3x4VRM_ED-EN-2_10-2018
- 29 -
10/2018
MALFUNCTION
POSSIBLE CAUSE
REMEDY
No compressor air
pumpsstarts up
Problem with electrical power source
Main breaker is off
Power loss
Check mains voltage
Loose terminal in switchboard - tighten
Check the primary power connection - replace if
damaged
Pressure switch failed
Check terminals and operation of the pressure switch -
replace if damaged
Any of the air pumps
does not start up
(indicator is on)
Loss of power to motor
Check mains voltage
Check the function of the contactors, and thermal relays
- replace if damaged
Loose terminals at the motor terminal strip - tighten or
replace if damaged or broken
Motor winding shorted, damaged /open
thermal protection/ high ambient
temperature
Replace the motor / decrease the ambient temperature
Seized up piston or other moving
component (mechanical damage to a
moving part)
Replace damaged parts
Controller malfunction
Check controller operation, check to ensure software is
present - replace if damaged or upload the correct
program
RUN/STOP indicator is
not green
Loss of connection between controller
and expansion module
Check connection – replace if damaged
Power loss
Check mains voltage
Loose terminal in switchboard - tighten
Check the primary power connection - replace if
damaged
Problem with electrical power source
Main breaker is off
Controller or expansion module
malfunction
Replace failed controller or expansion module
Air pumps switch often,
even without demand
for air
Air leak in compressed air distribution
system
Check compressed air distribution system – seal loose
joints
Leaky check valves
Test check vales and clean, or replace if damaged
Leak through solenoid valves once
regeneration is complete
Clean the check valve - replace if damaged
Leak at pressure sensor and safety
valve
Test their function and clean, or replace if damaged
Output of certain air
pumps is reduced,
extended run cycle
Compressor - air pump leaking
Check connections on the air pump for leaks – tighten
leaking connections
Worn piston rings
Replace worn piston
Gasket between cylinder head and
valve plate damaged
Replace gasket, tighten
Inlet filter is plugged
Replace old filter with a new filter
One of the air pumps is
noisy (knocking, metal
noises)
Damaged bearing, motor bearing
Replace damaged bearing
Damaged piston bearing, piston rod
Replace damaged piston
Failed (cracked) rubber mount spring
Replace damaged spring with new spring
High ambient
temperature causes air
pumps to switch off in
Lack of ventilation in compressor room
Secure suitable ambient conditions
Air pumps cooling fans, cooler does not Defective fans - replace
