EKOM DK50 9x4VRT/M, User Manual

DK50 9x4VRT/M

NP-DK50-9x4VRTM_ED-EN-2_10-2018                                                   - 40 -  

10/2018

Tab.4 

FAILURE 

POSSIBLE CAUSE 

REMEDY 

None of the compressor 
air pumps starts 

Problem with electrical power source 

Main breaker is off 

Loss of power  

Check mains voltage 
Loose terminal in the electrical box - tighten 

Check the main power connection - replace if damaged

Failed pressure switch 

Inspect the terminals and operation of the pressure 
switch - replace if damaged 

Some compressor air 
pumps do not start 
(indicators are on) 

Loss of power to motor 

Check mains voltage 

Check function of contactor and thermal relay - replace 
if damaged 

Loose terminal on motor terminal strip - tighten 
terminals, replace damaged or broken terminals 

Motor winding shorted, damaged /open 
thermal protection/ high ambient 
temperature 
 

Replace the motor / decrease the ambient temperature 

Worn piston or other moving component 
(mechanical damage to moving 
components) 

Replace damaged parts 

Controller malfunction 

Check the functionality of the controller and software – 
replace if damaged or reload the program 

RUN / STOP indicator 
does not light up green  

Open connection between controller and 
expansion module 

Check the connection and replace if damaged 

Loss of power 

Check mains voltage 

Loose terminal in the electrical box - tighten 

Check the main power connection - replace if damaged

Problem with electrical power source 

Main breaker is off 

Controller or expansion module 
malfunction 

Replace the malfunctioning controller or module 

Compressor air pumps 
switch frequently, even 
with no compressed air 
demand 

Air leak in compressed air distribution 
system 

Check compressed air distribution system – tighten the 
leaking connection 

Check valve leaking  

Test check valves and clean – replace if damaged 

Solenoid valves leaking after 
regeneration 

Clean the check valve – replace if damaged 

Leak at pressure sensor and safety 
valve 

Check functionality and clean – replace if damaged 

Functionality of certain 
compressor air pumps 
is reduced, run cycles 
are extended 

Leak at compressor air pump 

Check the compressor air pump for leaks – tighten the 
leaking connection 

Worn piston rings 

Replace worn piston 

Gasket between cylinder head and 
valve plate damaged 

Replace the gasket, tighten 

Intake filter is plugged  

Replace old filter with a new filter  

Certain compressor air 
pumps are noisy 
(knocking or metal-on-
metal sounds) 
 
 

Damaged motor bearing 

Replace damaged bearing 

Damaged piston bearing, piston rod 

Replace the damaged piston 

Failed (cracked) rubber mount spring 

Replace damaged spring with new spring 

High ambient air 
temperature when 
compressors on top of 

Insufficient ventilation in compressor 
space 

Secure suitable conditions 

Compressor air pump, cooler and 

Replace the defective fan(s)