Quick Start Guide
D103556X012
DVC6200 Digital Valve Controllers
July 2017
40
De-Energize to Trip (DETT) Digital Valve Controller
and DETT Solenoid Valve
In a typical deenergize to trip application with a solenoid valve, the logic solver (or DCS) trip signal deenergizes the
solenoid valve and also reduces the signal to the digital valve controller (4 mA, 0 VDC, or low state). This opens the
solenoid valve vent and drives the digital valve controller to the no output pressure condition. As a result, the safety
valve moves to its noair, fail safe position.
Figure 32. Digital Valve Controller and Solenoid
Valve Powered Separately
LOGIC SOLVER
OR DCS
LOGIC SOLVER
DETT
0-24 VDC DETT
AS
S
E1455
Figure 33. FIELDVUE DVC6200 SIS and Solenoid
Valve Powered Together
0-24 VDC DETT
LOGIC SOLVER
LC340
LINE CONDITIONER
LOW POWER
SOLENOID VALVE
AS
S
E1456
Note
When using an ASCO™
lowpower solenoid valve, model EF8316G303 or EF8316G304 (or an equivalent lowpower solenoid valve)
a separate external air supply for the pilot is required. Ensure that the solenoid valve's “selection gasket” is in the “external
position”. The pilot pressure must be at least 15 psig higher than the solenoid valve line pressure. For more information, refer to
the ASCO catalog or contact your Emerson sales office
or Local Business Partner.
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
digital valve controller output and the actuator input.
SIS
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