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 16 of 32
marked on the gear box. There is a small window
in the casting of the coupling housing between the
motor and gearbox to allow viewing of the rotating
parts.
2.
If the compressor operates in the opposite
direction, the air compressor will stop due to the
low oil pressure. At this time, alarm message will
appear.
3.
The oil pump motor and cooling fan motor are
wired at the factory to have the correct rotation
when the main motor is correct. You can check the
fan motor rotation by confirming that airflow is
upward from the top of the unit. If the oil pump
rotation is incorrect the pump will not generate
any oil pressure.
4.
After correct rotation is confirmed, close the back
panels.
Starting
1.
Open the compressed air outlet valve at the outlet
fitting. If possible open the outlet valves from the
receiver tank as well so the unit can start without
any compression load.
2.
Close the manual drain valves (manual drain
outlet).
3.
Push “ON” on the switch. On the touch panel, push
the “STATUS” button. As the compressor starts
running, the operation indicator on the lower right
will illuminate.
During Operation
1.
Close the air outlet valves at the exit of the receiver
tank slowly. Check the display of touch panel to see
if the outlet pressure rises.
2.
When outlet pressure reaches unloading pressure,
the compressor will be automatically switched to
unloaded operation. After the compressor runs in
unloaded operation for a total run time of 7
minutes the compressor will automatically stop.
Check the status of the compressor by touching
“STATUS” on the touch panel.
3.
Open the air outlet valve slowly. Check the display
of the touch panel to confirm the outlet pressure
decreases.
4.
When outlet pressure drops to the loading
pressure, the compressor will be automatically
switched to loaded operation. If the compressor
stopped automatically, it will automatically restart.
5.
For VFD modes the operating sequence is similar,
except that as the pressure increase to be near to
the unload pressure, the main motor is slowed
down. When pressure decreases the main motor
speed is increased. The minimum motor speed is
40% of nominal and if the pressure continues to
rise under this condition, the unload operation will
take over. If the machine remains unloaded an
automatic shutdown will occur.
6.
Operate the compressor in loaded operation for an
hour and check if there is any unusual noise,
vibration, or oil leakage.
7.
If problems are detected, shut down the unit and
make corrections.
Stopping
1.
Push “OFF” on the control panel switch. As the
compressor is being stopped, a message will be
displayed on the touch panel. If the compressor
was in loaded mode when the OFF button was
pushed, the control will force an unload condition.
The unit will run 30 seconds unloaded before
stopping.
2.
After the compressor is completely stopped,
disconnect the circuit breaker.
3.
Open the manual drain valve, and empty
condensate remaining in the separator.
Operation
Before Operation
1.
Open the front panel and check the oil level.
Appropriate oil level is above the center of the oil
gauge. If the oil level is below the center of oil
gauge, add oil before operation.
2.
Open the air outlet valves.
3.
Close the manual drain valves (manual drain port).
4.
Close the front panel.
