Rap 2.20 Pneumatic Pressure - Challenge CMT-130TC Service Manual

RAP 2.20 Pneumatic Pressure

Input 19
A pneumatic pressure switch is mounted to the
electrical panel. This switch indicates to the
trimmer when compressed air is connected and
switched on. The trimmer will not run without
compressed air connected and switched on.
Possible Fault Indicators

"No Air Pressure!" message is
displayed.

Trimmer is allowed to run even when
the air pressure is switched off.

One or more air cylinders are not func-
tioning properly.

Poor cut quality due to low clamping
pressure.
Initial Actions
Check that a compressed air line is connected to
the trimmer, and is suppling compressed air at
least 80 psi (for compressed air requirements
and hookup, see Section 8.8 Main Air Hookup).
Check that the main air valve at the back of the
trimmer is switched on.
Procedure
1. Read the main pressure gauge located at
the rear of the machine. Is input air pres-
sure at 80-90 psi?
Y N
Check and repair the hoses between the
main air connection and the main pressure
regulator (inside the rear door and behind
the main pressure gauge).
Adjust main regulator to 80-90 psi using the
control knob on the main regulator.
2. Status Indicator RAPs
2. Check and repair hoses between the main
regulator and the pressure switch port on
the backside of the electrical panel.
3. Check and repair loose wires 60 and 74.
4. Switch the main power ON and go to the di-
agnostic screen (GP 6.2 Input/Output Diag-
nostics). Is input "Pressure Switch" on?
Y N
Short wire 60 to 74. Does input "Pressure
Switch" come on?
Y N
Disconnect power and replace main
PWB (REP 4.23 Main PWB Replace-
ment).
Disconnect power and replace the switch
(PL 5.16 Power Panel EE-3503 (1/2)).
5. Switch the air off at the main air valve. Does
input "Pressure Switch" switch off?
Y N
Disconnect wire 60. Does input "Pressure
Switch" switch off?
Y N
Disconnect power and replace the main
PWB (REP 4.23 Main PWB Replace-
ment).
Disconnect power and replace the switch
(PL 5.16 Power Panel EE-3503 (1/2)).
Repair complete.
MAY 2019
2-28
Figure 2-24. Main Air Locations
Figure 2-25. Pressure Switch
CMT-130TC Book Trimmer