WhisperAir™ Oil-free Rotary Tooth Compressor
Model Series PCC & PCCMD – 50 HP
Powerex • 150 Production Drive • Harrison, OH 45030 • USA
(T) 1.888.769.7979 • (F) 513.367.3125 • www.powerexinc.com
IN594501AV • 02/2016
Page 29 of 32
Other Troubleshooting Topics
Problem
Cause
Corrective Action
Power lamp does not come
on or touch screen does not
light up
Faulty wire connection in electrical
panel
Check connections to transformer and to control. Clean and
reconnect problem connection.
Control circuit fuse open
Check for cause and replace fuse after correcting.
Lamp out on switch
Replace lamp/switch assembly
E-stop has been activated
Reset and restart
Touch panel is on, unit will
not turn on
Contactor malfunction
Replace, check other contactors for proper operation
E-stop has not been reset properly Reset and restart
Incorrect control signal
(use diagnostics screen to confirm)
Motor failure
Contact an authorized Powerex service technician to replace the
motor.
Oil pressure low
Correct oil problem. If necessary, contact an authorized Powerex
service technician to replace the oil pump.
Compressor does not unload
properly (High Temperature
may be indicated)
Inlet valve malfunction, not closing Contact an authorized Powerex service technician to rebuild or
replace inlet valve.
Check valve failure or unload
silencer clogged; causing incorrect
pressure ratio in unload mode
Contact an authorized Powerex service technician to rebuild or
replace check valve.
VFD type: Confirm unit goes to low
speed before unload
Contact an authorized Powerex technician to adjust settings or
replace VFD.
Compressor unit runs, will
not load
Pressure not low enough to reach
load setting
Check settings and actual pressure, correct as needed.
Air leak on signal line to inlet valve Contact an authorized Powerex service technician to repair or
replace air signal lines.
Diaphragm malfunction (torn or
leaking)
Contact an authorized Powerex service technician to rebuild or
replace inlet valve.
Unload solenoid malfunction
Contact an authorized Powerex service technician to rebuild or
replace solenoid valve.
Control solenoid not getting
operating signal
Use diagnostics screen to confirm. Contact an authorized Powerex
technician to repair or replace malfunctioning control components.
Compressor runs load
condition, will not unload;
Safety valve opens
Faulty safety valve
Verify with pressure readout on screen. Replace malfunctioning valve
with a Powerex replacement part.
Solenoid valve malfunction
Confirm and replace if faulty
Inlet valve malfunction, will not
close
Contact an authorized Powerex service technician to rebuild or
replace inlet valve.
Final Pressure sensor malfunction
Contact an authorized Powerex service technician to replace the
sensor or cable as needed.
Control signal malfunction
Use diagnostics screen to confirm. Contact an authorized Powerex
technician to repair or replace malfunctioning control components.
Low Outlet air pressure unit
is loaded.
Air consumption more than
capacity of compressor
Check consumption. Contact a Powerex distributor to increase air
system supply capability.
