Fisher FIELDVUE DVC6200p Instruction Manual page 39

Instruction Manual
D103563X012
Double‐Acting Relay
The double‐acting relay is designated by "Relay A" on a label affixed to the relay itself. For double‐acting actuators, the
valve must be near mid‐travel to properly adjust the relay. The valve will automatically be positioned when Relay is
selected.
CAUTION
Care should be taken during relay adjustment as the adjustment disc may disengage if rotated too far.
Rotate the adjustment disc, shown in figure 4‐1, until the output pressure displayed is between 50 and 70% of supply
pressure. This adjustment is very sensitive. Be sure to allow the pressure reading to stabilize before making another
adjustment (stabilization may take up to 30 seconds or more for large actuators).
If the low bleed relay option has been ordered stabilization may take approximately two minutes longer than the
standard relay.
Relay A may also be adjusted for use in single‐acting‐ direct applications. Rotate the adjustment disc as shown in figure
4‐1 for single‐acting direct operation.
Figure 4‐1. Relay A Adjustment (Shroud Removed for Clarity)
ADJUSTMENT DISC
W9034
FOR SINGLE‐ACTING DIRECT
RELAYS: ROTATE ADJUSTMENT
DISC IN THIS DIRECTION UNTIL IT
CONTACTS THE BEAM
FOR DOUBLE‐ACTING RELAYS:
ROTATE ADJUSTMENT DISC IN
THIS DIRECTION TO DECREASE
OUTPUT PRESSURE
FOR DOUBLE‐ACTING RELAYS:
ROTATE ADJUSTMENT DISC IN
THIS DIRECTION TO INCREASE
OUTPUT PRESSURE
Calibration
June 2017
37