Instruction Manual
D200160X012
4195K Controllers
July 2018
17
D
For reverse control action—
An increasing sensed vacuum decreases output pressure.
After changing the action, tighten the screws on the proportional band indicator cover.
Switching The Auto/Manual Station (suffix letter E)
Note
Switching the controller between automatic and manual, or manual and automatic mode, without balancing the outputs, can
disturb the process and cause controller cycling.
Refer to figure 3‐1 if the controller has the auto/manual station (suffix letter E). To switch from automatic to manual
mode, or from manual to automatic, you must first balance the manual output with the controller output. Two
balance methods are available to equalize the manual output with the controller output.
To switch from automatic to manual mode, carefully adjust the loader knob until the metal ball inside the plastic tube
moves into the switching zone. Then move the automatic/manual switch to MANUAL. Turn the loader knob clockwise
to increase the controller output or counterclockwise to decrease it.
To switch from manual to automatic mode, adjust the set point to move the ball into the switching zone. Turn the
switch to AUTO and adjust the set point to control the output.
When the auto/manual switch is in AUTO, adjusting the loader knob has no effect on the controller output. When the
auto/manual switch is in MANUAL, changing the set point has no effect on the controller output.
Prestartup Checks for 4195KA Controllers
Refer to figure 3‐1 for adjustment locations and refer to figure 7‐1 for key number locations.
When performing the checks, open loop conditions must exist. An open loop exists when the controller output does
not affect the input pressure or other control signal to the controller.
Note
If the controller has the auto/manual station (suffix letter E), be sure the controller is in the automatic mode before performing the
prestartup checks.
1. Provide a means of measuring the controller output pressure by connecting the controller output to a pressure
gauge. Connect supply pressure to the supply pressure regulator and be sure it is delivering the proper supply
pressure to the controller. Do not exceed the normal operating pressure in table 1‐6.
2. For a controller with remote set point (suffix letter M), connect regulated pressure of 0.2 to 1.0 bar (3 to 15 psig) or
0.4 to 2.1 bar (6 to 30 psig) to the remote set point connection at the top of the controller case.
3. Remove the two machine screws (key 6) and lift off the proportional band indicator cover (key 36).
4. Adjust the set point a minimum of 20 percent of input span above the process pointer.
5. Adjust the proportional band for 5 percent DIRECT.
6. If necessary, connect a pressure source to the process connection and adjust the process pointer to the last mark on
the left side of the scale. If the last scale mark is 0 psig, a pressure source is not required.