VS18/VS26
MAINTENANCE & INSTRUCTION BOOKLET
10.2.4 Failures
•
In case of failure check the connection of pipes, the operating voltage as well as the
operating pressure.
•
With Fieldbus valve islands, check the LED indicators and the PLC for error messages.
Please refer to section
for the definition of LED indicators.
•
Any service or repair work as well as replacement of components must be taken in
unpressurized condition. Also, power must be removed from the system.
•
Important: It is not allowed to detach a plug or to open a body in a zone with potentially
explosive atmosphere when power is not removed.
10.2.5 Maintenance and repair
Maintenance, inspection and assembly work must be taken by authorised and qualified
personnel. Work on pilot valves in general must be taken in unpressurized and cooled off
condition. Also, power must be removed from the system. It is recommended to make
precautionary maintenance depending on the operating conditions and in case of significant
changes in response times. The user is liable for adequate test and maintenance spacing
dependent on the operating conditions of the valves. Precipitation, contamination, and aged or
worn gaskets can cause failures. Gaskets must be included to ensure the protection class.
Damaged parts must be replaced with original spare parts from Norgren.
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