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Constant-Air Pressure Control Loop
Voith Turbo I Aftersales Service Manual Voith Retarder VR 115 E I Diagnosis and Troubleshooting
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5. With the multimeter (measuring type: volts),
measure the voltage at the retarder tester socket
"U_Versorgung".
The value must lie between 4.75 and 5.25 V.
If this value is not reached: Replace proportional
valve (3700).
6. With the multimeter (measuring type: volts),
measure the voltage at the retarder tester socket
"U_p
y
IST".
The value must lie between 0.3 and 0.7 V.
If this value is not reached: Replace proportional
valve (3700).
7. Retarder tester switch "Stelldruck“ in position
"100%".
8. After approx. 20 seconds, the value "Act.setting
pressure" displayed in Diana-Lite and the value
displayed on the air pressure gauge (99/7) have to
lie between 2.6 and 3.1 bar.
If these values are not reached: Replace
proportional valve (3700).
9. Retarder tester switch "Stelldruck“ in position
"0%".
10.Toggle switch at the retarder tester in position
"AUS".
11.Vehicle ignition: OFF
12.Detach the retarder tester (99/30) and pressure
gauge (99/7), complete the retarder and vehicle.
To assess the operation of the proportional valve
(3700), the results of the following test are only
valid during a testing period of 60 seconds
maximum.
NOTE
