Quick Start Guide
D103556X012
DVC6200 Digital Valve Controllers
August 2015
41
DVC6200 SIS for PST only and De-Energize to Trip (DETT) Solenoid Valve
In this application, the logic solver trip signal deenergizes the solenoid valve, which opens the solenoid vent valve. The
DVC6200 SIS is configured as energize to trip (ETT) and uses a reverse acting relay (Relay B) to drive the digital valve
controller to the no output pressure condition. The energize to trip option provides maximum actuator pressure at
minimum control signal (4 mA). Therefore, loss of the control signal will not cause the safety valve to trip. The safety
valve moves to its noair, fail safe position when the logic solver (or DCS) sets the current to the digital valve controller
to 20 mA. Partial stroke testing occurs at minimum control signal (4 mA).
Figure 34. FIELDVUE DVC6200 SIS and Solenoid Valve Powered Separately
LOGIC SOLVER
OR DCS
LOGIC SOLVER
4-20 mA ETT
0-24 VDC DETT
AS
S
SINGLE-ACTING, REVERSE (RELAY B)
4 mA = FULL SUPPLY TO ACTUATOR
E1459
1. Install the solenoid valve on the actuator casing or actuator yoke.
2. Install at least 10 mm (3/8inch) diameter tubing such that the solenoid valve is in the pneumatic path between the
DVC6200 SIS output and the actuator input.
3. Connect the logic solver output card +/ terminals to the corresponding solenoid valve +/ wires.
4. Connect the logic solver (or DCS) output card +/ terminals to the corresponding DVC6200 SIS LOOP +/ terminals.
5. Proceed to Step 4—Configure the Digital Valve Controller on page 33.
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