ACS 561 Service Manual
Robert Bosch GmbH
SP00D00517
2018-07-11
42
Diagnostics and Testing
Figure 2-2. Vacuum Pump Assembly
Vacuum Pump Troubleshooting
1. Check gauges for vacuum.
2. If pressure is over 0.7 kgf/cm
2
(10 psi), re-
cover hoses.
3. If unit won’t maintain vacuum, check high
and low side charge solenoids, hoses,
couplers, gauges, and other related com-
ponents, for leakage.
4. If there is no pressure on the gauges and
the display says Pressure Exists, enter the
Service Menu and verify low side inlet trans-
ducer reading. If it is reading pressure where
none exists, replace transducer. If replacing
the transducer doesn’t correct the reading,
replace the control board.
5. If the compressor is not running or appears
to be running poorly, refer to Vacuum Pump
Does Not Run.
Vacuum Pump Does Not Run
1. Check for proper power source, circuit
breaker, and electrical connectors for dam-
age or corrosion. Replace or repair as
required.
2. Connect the unit power cable directly to the
power source. Do not use an extension cord.
3. Check for 230 Volts at the vacuum pump
connector, pins 2 and 3.
• If voltage is present, replace vacuum
pump assembly.
• If voltage is not present, continue to next
step.
When checking voltage to the vacuum
pump it is normal to read low voltage at
the connector when it’s disconnected
and the power to the vacuum pump is off.
4. Check for 230 Volts from the power board
on connector P4 pins 3 and 4.
• If voltage is present, check wiring be-
tween the power board and the vacuum
pump. Repair as needed.
5. Use the output test and verify fan operation.
• If the fan is not functioning, check/verify
wiring, switches, and circuit breaker.
• If the fan is functioning, replace the power
board.
• If voltage is not present, replace the
power board.
If fan works, power is present at the
power board. The fan, vacuum pump,
and compressor use the same power
source.
6. Perform functional check.
Vacuum Pump
Содержание ACS 561
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