Declaration Of Conformity - Moog D663K-Serie Betriebsanleitung

6 Faults
Origin and Trouble-Shooting
6.1 Leakage at the mounting surface of the valve
Are all seals installed at ports A, B, P and T ok?
Is the seal at port Y ok?
Are the mounting bolts tightened correctly?
Pay attention to the required torque!
Tighten bolts crosswise!
6.2 Leakage at the screw plug of the linear force motor
Are ports P and T connected properly?
Check pressure in ports T and Y.
The return pressure in the T port should not
exceed 50 bar.
6.3 No hydraulic responce of the valve
Check all signals from pin A to pin F.
Is supply voltage present?
Check the socket strip for corrosion.
Is hydraulic pressure present?
Are all hydraulic ports connected properly?
6.4 Instability in the system, closed loop oscillates
Check, whether output signal at pin F is following ex-
actly the command signal at pin D!
If so, the electronics of the valve is in order; the fault is
in the external control loop.
If not, the electronics of the valve may be faulty or the
control circuit should be retuned.
6.5 Loss of command signal or broken cable
With loss of command signal or broken command cable
the spool returns to the position corresponding to com-
mand signal "Zero".
6.6 Loss of supply voltage or broken cable
With loss of supply voltage, or broken cable, or emergency
stop the spool returns to its spring centred position.
10 Operating Instructions D633K, D634K and D635K (CA49304-001; Version 6.0, 12/09)
D633K, D634K and D635K Series
7

Declaration of Conformity

A declaration of conformity as defined by directive
IEC 60079 is issued for proportional valves
D633K, D634K and D635K Series and is shown in
this operating instructions.
© 2003, 2007, 2009 Moog GmbH