Special Instructions For Solenoid Valve Health Monitoring - Fisher FIELDVUE DVC6200 Quick Start Manual

Quick Start Guide
D103556X012
Special Instructions for Solenoid Valve Health
Monitoring
If a solenoid valve is installed between the digital valve controller pressure output and the actuator, the digital valve
controller can be configured to verify the operation of the solenoid valve. This applies to single-acting actuator
applications only. The "unused" output port of the digital valve controller is tubed such that the pressure downstream
of the solenoid valve is measured. When the solenoid valve is pulsed, either by the DVC6200 SIS (see page 44) or
externally (see D104028X012), the digital valve controller senses the momentary pressure drop across the solenoid
valve and records data for performance evaluation.
Figure 35. Tubing for Solenoid Valve Health
Monitoring, De­Energize to Trip Digital Valve
Controller
CONTROL LINE
A
B
MONITORING
LINE
E1639
For De-Energize to Trip applications (figure 35), install at least 10 mm (3/8inch) diameter tubing between output B
(bottom port) of the digital valve controller output and the tubing segment between the solenoid valve and safety
valve actuator.
For Energize to Trip applications (figure 36), install at least 10 mm (3/8inch) diameter tubing between output A (top
port) of the digital valve controller output and the tubing segment between the solenoid valve and safety valve
actuator.
In both applications, install pressure gauges or pipe plugs in all three of the pressure gauge connections under the
cover.
Note
The monitoring line should be tapped into the control line as close to the actuator as possible, away from the solenoid valve. This
will minimize the effect of transients in the pressure readings due to the solenoid valve actuation.
S
DVC6200 Digital Valve Controllers
Figure 36. Tubing for Solenoid Valve Health
Monitoring, Energize to Trip Digital Valve Controller
SINGLE-ACTING, REVERSE (RELAY B)
4 mA = FULL SUPPLY TO ACTUATOR
A
B
CONTROL LINE
E1640
January 2017
SIS
MONITORING
LINE
S
43