24
7 VG9H 70 en
7
TROUBLE SHOOTING
Mechanical/electrical defects
1. Any request to change the valve position has no affect to
the position
Spool valve sticks
Incorrect configuration parameters
Actuator and/or valve jammed
Signal wires incorrectly connected, no value on dis-
play
Circuit boards are defective
Calibration has not been carried out
Prestage is defective
Spool mounted backwards into spool valve
Supply pressure too low
2. Inaccurate positioning
Too high actuator load
Supply pressure too low
Pressure sensors are defective
Actuator leakage
Spool valve dirty
3. Overshooting or positioning too slow
Supply air tube too small or supply air filter dirty
Valve sticks
Check leakages in tubes between controller and
actuator
Check leakages in mechanical stop screws
Spool valve dirty
4. Error during valve travel calibration
The parameter setting
PFA
incorrectly selected
Check the coupling alignment with the pointer, see
Fig. 7.
The actuator or valve did not move or was stuck dur-
ing calibration
Supply pressure too low
Spool valve dirty
8
VG9_H/D_, VG9_H/R_, VG9_H/I_,
VG9_H/K_, VG9_H/T01
(WITH LIMIT SWITCHES OR SIL PT)
8.1
Introduction
8.1.1
General description
VG9000H can be equipped with limit switches or external
SIL certified position transmitter. VG9000H/D__ has a Dual
Module sensor with two inductive proximity switches,
VG9000H/R_ has two reed type proximity switches,
VG9000H/I__ has two inductive proximity switches,
VG9000H/K2_ has two microswitches and VG9000H/K4_
has four microswitches. VG9000H/T01 has SIL certified posi-
tion transmitter. Limit switches and position transmitter are
used for electrical position indication of the valves.
The switching points for limit switches may be chosen
freely.
Fig. 27
VG9_H/D_ layout
Fig. 28
VG9_H/R_ layout
Fig. 29
VG9_H/I_ (I02, I09, I32, I56) layout
Dual module
2 cams
ground
terminals
conduit
entry
conduit
entry
mA loop
PT
Reed switch
2 cams
ground
terminals
conduit
entry
conduit
entry
mA loop
PT
2 proximity
switches
terminals
2 cams
ground
conduit
entry
conduit
entry
