Metso ND9200H, Инструкция по установке, обслуживанию и эксплуатации, Страница: 21 / 32

21
7 TROUBLE SHOOTING
Mechanical/electrical defects
1. A change in the valve position setpoint will not affect
the position of the actuator
❑
Supply pressure too low
❑
Spool valve sticks
❑
Incorrect configuration parameters
❑
Actuator and/or valve jammed
❑
Signal wires incorrectly connected, no value on
display
❑
Circuit boards are defective
❑
Calibration and tuning has not been carried out
❑
Device is in manual mode
❑
Prestage is defective
❑
Device is in fail-safe mode
❑
Spool mounted backwards into spool valve
2. The actuator goes to the end position with a small
change of input signal
❑
Tubes between controller and actuator are incor-
rect, see Fig. 6
❑
The parameter settings PFA and ROT are incor-
rectly selected.
3. Inaccurate positioning
❑
Spool valve dirty
❑
Too high actuator load
❑
Supply pressure too low
❑
Spool or pressure sensors are defective
❑
Actuator leakage
4. Overshooting or positioning too slow
❑
Change PERF value
❑
Spool valve dirty
❑
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
5. Error during valve travel calibration
❑
Valve controller is in MAN mode
❑
Check the coupling alignment with the pointer,
see Fig. 5.
❑
The parameter settings PFA and ROT are incor-
rectly selected
❑
The actuator or valve did not move or was stuck
during calibration
❑
Supply pressure too low
❑
Spool valve dirty
8 TOOLS
No special tools required.
9 ORDERING SPARE PARTS
Spare parts are delivered as modules. The modules
available are indicated in 10.1.
When ordering spare parts, always include the following
information:
❑
Valve controller type designation and serial
number from the ID plate
❑
The code of this manual, the part number, the
part name and quantity required