Fisher LCP200, Instruction Manual, Page: 15 / 24

Instruction Manual
D104296X012
LCP200 Local Control Panel
August 2018
15
Principle of Operation
The lights indicate the state of the valve as described in table 4. Contact operation is described in table 5.
Note
The primary safety function should be implemented by controlling the current (in point‐to‐point mode) or voltage (in multi‐drop
mode) from the logic solver. The Middle (Red/Trip) button is not intended to perform the primary safety function for the process.
Table 4. Fisher LCP200 Light and Button Operation
WHAT THE LCP200 LIGHTS SHOW... POSSIBLE CONDITIONS...
PRESS INDICATED BUTTON TO...
Top Middle Bottom
Top
(Green/Normal)
Solid The valve is in its normal operating state. - - - Trip Run PST
Fast Blink (1/2 second)
The valve is in the process of running a partial stroke
test (PST).
Stop PST Trip Stop PST
The valve is not at its normal operating position because
the actuator pressure is low or the valve is stuck. Acknowledge
PST Failure
Trip Run PST
The valve is tripped but is stuck at the normal position. - - - - - - - - -
Slow Blink (1 second) A partial stroke test has failed.
Acknowledge
PST Failure
Trip Run PST
Middle
(Red/Trip)
Solid
The valve is tripped due to loss of actuator pressure
(e.g., solenoid valve trip) Acknowledge
PST Failure
Trip Run PST
The valve is tripped due to a command from the logic
solver or LCP200.
- - - - - - - - -
The valve is stuck in the tripped state. - - - - - - - - -
Fast Blink (1/2 second)
The valve is at mid-travel after a trip. The valve may be
moving or stuck in this position.
- - - - - - - - -
Bottom
(Yellow/
Ready-to-Reset)
Solid The valve may be reset to the normal operating state.
Reset to
Normal State
- - - - - -
Notes:
1. If the top, middle, and bottom lights are blinking in sequence, then the DVC6200 SIS is out of service. In point-to-point mode, the DVC6200 SIS will not
respond to a trip from the logic solver.
2. Depending on the emergency shutdown valve configuration, the top button could be labeled “Valve Open” and the middle button could be labeled
“Valve Close”; or vice versa. The bottom button will aways be labeled “Valve Test”.
3. Acknowledgment of a PST failure means that the LCP200 will return the blinking top light to a solid light. The PST alert will still be visible via HART
communication with the DVC6200 SIS.
4. If the top and middle lights are both solid the valve is throttling in mid‐travel.
5. The information contained in this table applies to firmware 9 and later.
Table 5. Fisher LCP200 Contact Operation
Contact Normal Operation Bench Mode
Trip
Activated for 1.5 to 3 seconds when Trip button is
pressed for 0.5 seconds or more.
Activated as long as Trip button is pressed.
Reset
Activated for 1.5 to 3 seconds when Reset button is
pressed for 0.5 seconds or more.
Activated as long as Reset button is pressed.
Test Activated when partial stroke test is in progress. Activated as long as Test button is pressed.
1. Refer to the Maintenance section for Bench Mode details.