Reverse To Direct Action - Emerson Fisher C1 Instruction Manual

C1 Controllers and Transmitters
March 2017
3. Do not invert the reversing block unless also changing the controller action from direct to reverse (or vice versa).
4. Invert the proportional band assembly (refer to figure 17):
a. Turn the proportional band adjustment knob (key 73) to 10.
b. Unscrew the spring adjustor (key 65), removing the bias spring (key 70) and washers (key 64) with it.
c. Unclip the lock spring (key 72). Remove the indicator scale (key 69) and proportional band adjustment knob
(key 73).
d. Remove the gain adjustment bar (key 63). Flip it over so it attaches to the opposite side of the cantilever spring
(key 8), as shown in figure 16, and screw it back down.
e. Flip over the indicator scale (key 69); install it and the proportional band adjustment knob (key 73) as a unit. Snap
in the lock spring (key 72).
f. Tighten down the spring adjustor (key 65) with the bias spring (key 70) and washers (key 64) until it stops against
the gain adjustment bar (key 63).
g. Turn the proportional band adjustment knob to the 10 setting. If it cannot be turned to the 10 setting loosen the
spring adjustor (key 63).
5. Check all connections for leaks with a soap-and-water solution. Perform the appropriate calibration procedure.
Figure 17. Proportional Band Assembly
PROPORTIONAL BAND ADJUSTMENT KNOB
CANTILEVER SPRING
GE34725-B

Reverse to Direct Action

Use the numbered steps below to change from reverse action (increasing process pressure produces decreasing
output pressure) to direct action (increasing process pressure produces increasing output pressure), or vice versa.
Changing the action is accomplished by reversing the positions of the reversing block, proportional band assembly,
and bellows tubing(s). Refer to figures 16, 17, 18, and 21 for key number locations unless otherwise directed.
1. Isolate the controller or transmitter from process, control, and supply pressure. Vent any trapped pressure from the
controller or transmitter before proceeding with this procedure.
2. As shown in figure 18, locate the new tubing, proportional band assembly, and reversing block positions for the
desired action.
34
(KEY 73)
LOCK SPRING
(KEY 72)
(KEY 8)
SPRING SPACER
(KEY 245)
BIAS SPRING
(KEY 70)
WASHER
(KEY 64)
SPRING ADJUSTOR
(KEY 65)
Instruction Manual
D103292X012
MACHINE SCREW
(KEY 56)
INDICATOR SCALE
(KEY 69)
MACHINE SCREW
(KEY 74)
GAIN ADJUSTMENT BAR
(KEY 63)