User manual
CompAir BroomWade Limited
page 42
2.4 Fixed Parameters
The motor star/delta time and blowdown time are
set automatically, depending on the compressor
model programmed in the controller.
Parameter Unit Model
C330 C337 C345
Star/Delta time secs 5·0 5·5 6·0
Blowdown time secs 25 25 25
Note: The blowdown time occurs when the drive
motor stops. The compressor cannot be started
during the blowdown time.
3. PRESSURE CALIBRATION MODE
3.1 Pressure Calibration Routine
The pressure calibration routine is used to
calibrate the controller to the pressure transmitter
to obtain an accurate pressure display reading
when commissioning or re-commissioning the
compressor and at each major service interval.
The routine should also be used when renewing
the controller or pressure transmitter.
1. Stop the compressor and isolate the
compressor air delivery from the user’s
system.
2. Remove the air pipe from the pressure
transmitter to establish a true zero pressure
condition.
Note: Calibration will be affected if the air pipe is
not removed before entering calibration mode.
3. Press and hold
PLUS
(B4),
MINUS
(B5) and
STOP
(B3) together.
4. After five seconds indicators L1 to L8 will
flash four times to indicate that the controller
is now in pressure calibration mode. Release
PLUS
(B4),
MINUS
(B5) and
STOP
(B3)
when the indicators start to flash.
5. The display will show 0.0 Bar. If the pressure
transmitter signal is outside of acceptable
limits. The controller will automatically return
to normal running mode and display a
pressure transmitter fault.
6. Apply an accurately known pressure, above
5.5 Bar, to the pressure transmitter.
7. The display will not start to indicate a reading
until the applied pressure is above 5.5 Bar.
8. Use
PLUS
(B4) and
MINUS
(B5) to increase
or decrease the display reading.
Note: The controller will not allow the display to be
adjusted outside of set maximum and minimum
limits. The display will show four horizontal lines if
the calibration limits are exceeded.
9. Press
STOP
(B3) when the pressure display
matches the applied pressure. The display
will return to normal running mode.
10. Press
RESET
(B6) at any time to abandon
the calibration sequence and return to normal
running mode.
11. Remove the pressure applied at Step 6.