Fault Matrix - Bosch CRR 120 Repair Instructions

6.

Fault matrix

No. Symptom (complaint)
1 Device cannot be switched on by
way of inlet valve with red actu-
ator
2 Device pressure fluctuations/loss
of pressure (pressure gage Po)
3 Device is not switched on after ac-
tuating inlet valve with red actu-
ator (display of display module
does not light)
4 Display of display module does
not light, no display
5 Pressure cannot be adjusted by
way of potentiometer P1 (display
of display module lights)
6 Pressure cannot be adjusted by
way of potentiometer P2 (display
of display module lights)
7 Pressure cannot be adjusted by
way of potentiometers P1 and P2
(display of display module lights)
8 Pressure set by way of potentiom-
eters P1 and P2 is not displayed
(display of display module lights)
9 No pressure at connection A
10 No pressure at connection B
(pressure is displayed by pressure
gage Po)
Robert Bosch GmbH
Possible cause of trouble/defective
component
Inlet valve (WAP 3/2) sticking, stiff
Leakage at pneumatic system components
and connections
Pressure switch not being supplied with
power, defective
Power supply of voltage stabilizer not
switched on (24 DC)
Voltage stabilizer current limitation set-
ting too low
Protective diode defective
Fuse defective
Pressure switch not being supplied with
power, defective
Display module not being supplied with
power
Potentiometer knob not gripping on poten-
tiometer stem
Potentiometer defective
P1/P2 selector switch defective
Potentiometer knob not gripping on poten-
tiometer stem
Potentiometer defective
P1/P2 selector switch defective
Potentiometer knob not gripping on poten-
tiometer stem
Potentiometer defective
P1/P2 selector switch defective
Pressure control valve (ED02) not being
supplied with power, defective
Pressure control valve (ED02) defective
Pressure sensor (P WIKA) not being sup-
plied with power
Pressure sensor (P WIKA) defective
Leakage at valve WST 5/2 (white actuator) Eliminate leakage
Valve WST 5/2 (white actuator) defective
Leakage at valve WST 5/2 (white
actuator)
Blockage at valve WST 5/2 (white actua-
tor)
Valve WST 5/2 (white actuator) defective
Fault matrix | CRR 120 | 25
Fault rectification
Replace inlet valve (WAP 3/2)
Check pneumatic system components and
connections for leaks
Check power supply and output signal of
pressure switch, replace pressure switch
Switch on and set voltage stabilizer accord-
ingly (24 V, I > 0.2 A)
Switch on and set voltage stabilizer accord-
ingly (24 V, I > 0.2 A)
Check/replace diode 1N4007
Check/replace fuse 5X20 0.5 A slow-blow
Check power supply and output signal of
pressure switch, replace pressure switch
Check power supply at terminal strip X1
Tighten locking screw of potentiometer knob/
replace potentiometer knob
Replace potentiometer
Replace selector switch
Tighten locking screw of potentiometer knob/
replace potentiometer knob
Replace potentiometer
Replace selector switch
Tighten locking screw of potentiometer knob/
replace potentiometer knob
Replace potentiometer
Replace selector switch
Check power supply to pressure control valve
(ED02)
Replace pressure control valve (ED02)
Check pressure sensor (P WIKA) power sup-
ply
Replace pressure sensor (P WIKA)
Replace valve WST 5/2 (white actuator)
Eliminate leakage
Replace valve WST 5/2 (white actuator)
Replace valve WST 5/2 (white actuator)
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2014-01-14