Emerson FIELDVUEDVC2000 Manuál s instrukcemi stáhnout pdf (Strana 17)

Instruction Manual

D103176X012

Installation

April 2014

8. Check for clearance between the magnet assembly and the DVC2000 feedback slot. The magnet assembly should

be positioned so that the index mark on the pole pieces (back of the positioner housing) is within the valid range on

the magnet assembly throughout the range of travel. See figure 2‐2.

9. Install tubing between the actuator casing and the pneumatic positioner output connection that has the arrow

pointing away from the opening. See figure 2‐7.

10. Install a vent in the port on the lower diaphragm casing.

Note

When field converting a GX actuator from fail-open to fail-closed (or vice-versa), you will need to change the plugs for the

pneumatic passages in the DVC2000 housing.

To convert to fail-closed, remove the R1/8 pneumatic plug on the back of the DVC2000 housing and install an O-ring. Plug

the external pneumatic output with a 1/4 NPT or G1/4 plug (depending on the housing version). Refer to figure 2‐12.

To convert to fail-open, remove the external pneumatic plug (1/4 NPT or G1/4 plug depending on the housing version).

Install an R1/8 plug on the back of the DVC2000 housing. Install tubing between the pneumatic output connection of the

DVC2000 to the pneumatic port on top of the actuator casing.

Guidelines for Mounting on Quarter-Turn (Rotary) Actuators

The DVC2000 digital valve controller can be mounted to any quarter-turn (rotary) actuator, as well as those that

comply with the NAMUR guidelines. A mounting bracket and associated hardware are required. Refer to figure 2‐13.

1. Isolate the control valve from the process line pressure and release pressure from both sides of the valve body. Shut

off all pressure lines to the actuator, releasing all pressure from the actuator. Use lock-out procedures to be sure

that the above measures stay in effect while you work on the equipment.

2. Attach the magnet assembly to the actuator shaft. At mid-travel, the flats on the magnet assembly should be

approximately parallel to the channel on the back of the DVC2000 housing, as shown in figure 2‐14.

Figure 2‐13. For Rotary Actuators (with Typical Mounting Bracket Shown)

W8835

MOUNTING

BOLTS (4)

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 107 108

Žádné komentáře

Emerson FIELDVUEDVC2000 Manuál s instrukcemi Strana 17