Woodward QuickTrip - Chapter 6. Safety Management; SIL Specifications

Manual 26815 QuickTrip Electro-Hydraulic Trip Block Assembly
Woodward 44
Table 7-1. QuickTrip Troubleshooting Guide
General Faults
Problem
Cause
Remedy
One or More Valves Fails
to Close (Reset)
Input Power below specified limit
Check power source and connections
(Chapter 2: Electrical Specifications).
Speed sensor logic solver is in a
trip state
Ensure turbine is running and speed sensors
and logic solver are functioning correctly and
that all wiring connections are correct
Malfunctioning electronics module
or solenoid
Replace electronics module or solenoid (refer
to manual 26842 for hardware replacement
procedure).
Valve seized / Excessive oil
contamination
Ensure hydraulic fluid meets recommended
filtration and ISO cleanliness levels specified
in Chapter 2: Hydraulic Specifications.
Ensure proof test is performed at an
appropriate interval as recommended in
Chapter 6: Safety Management. Replace and
filter oil and flush clean oil through the valve.
Operating temperature too high
Check ambient operating temperature and
verify that it falls within the requirements
outlined in the Chapter 2: Environmental
Specifications.
One or More Valves Fails
to Open (Trip)
Speed sensor logic solver is in a
run state
Ensure all speed sensors and logic solver are
functioning correctly and that all wiring
connections are correct.
Valve seized / Excessive oil
contamination
Ensure hydraulic fluid meets recommended
filtration and ISO cleanliness levels specified
in Chapter 2: Hydraulic Specifications.
Ensure proof test is performed at an
appropriate interval as recommended in
Chapter 6: Safety Management. Replace and
filter oil and flush clean oil through the valve.
Supply hydraulic pressure exceeds
maximum
Check hydraulic supply pressure and
regulator setting
Broken return spring
Check/replace return spring (refer to manual
26842 for hardware replacement procedure)
Trip time too long (> 50
ms)
Supply hydraulic pressure exceeds
maximum
Check hydraulic supply pressure and
regulator setting
Valve seized / Excessive oil
contamination
Ensure hydraulic fluid meets recommended
filtration and ISO cleanliness levels specified
in Chapter 2: Hydraulic Specifications.
Ensure proof test is performed at an
appropriate interval as recommended in
Chapter 6: Safety Management. Replace and
filter oil and flush clean oil through the valve
Power Supply #1 or #2
LED indicator is not on
Power supply is not turned on or
wiring is not connected
Check power source and connections
(Chapter 2: Electrical Specifications).
Power supply voltage or current are
below recommended ratings
LED damaged or malfunctioning Replace electronics module (refer to manual
26842 for hardware replacement procedure)
Released