Proportional Pressure Valves
Series RE*T / R*V
Operation Manual
21
Parker Hannifin Corporation
RE_-R_V obe_24-45-A-B 5715-651 UK 29.01.19
malfunction at hydraulic load runtime
- generally no function
- high frequent oscillation
- low frequent oscillation
- pressure at unchanging command
- pressure too low
- drifting without command
possible reasons for malfunction corrective actions
x hydraulic pump resp. motor defective replace hydraulic pump resp. motor
x x x x drive overloaded reduce pressure resp. speed, increase valve size
x x x x x valve contaminated clean pressure fluid, filter / flush valve
x x hydraulic fluid too viscous / too cold change fluid grade, provide operational temperature
x x too low oil level within tank refill pressure fluid
x x filter contaminated replace filter
x x x x supply voltage too low keep supply voltage range
x supply voltage carries too much ripple reduce ripple
x x command signal too low increase command signal
x command signal carries too much ripple reduce ripple
x dither signal amplitude too high reduce parameter P5
x dither signal amplitude too low increase parameter P5
x x x x x central connector contact failure clean contacts resp. replace connector
x feed cable interrupted fix feed cable
x x x x x x wiring sequence incorrect correct wiring sequence
x x feed cable without shielding change cable grade
6. Trouble Shooting
Basis of troubleshooting is always a systematic
approach.
For suspect of a sluggish spool the valve may
be flushed with clean pressure fluid.
Troubleshooting in a hydraulic system requires
detailed knowledge about function and
construction of the system. Therefore the work
may exclusively be performed by qualified
personnel.
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