Slide Valve Actuator Installations Instructions; Installation; Overview; Actuator Motor Control Module Calibration Procedure - Emerson VILTER VSS Installation, Operation And Service Manual

Section 3 • Installation
must be adjusted to reduce the compressor shaft move-
ment to less than 0.002". For example, the compressor
shaft should not move more than 0.002" when piping is
removed or connected to the compressor.
IMPORTANT – piping elements shall be supported per
the requirements of ASME B31.5 / B31.3 or other local
codes as applicable. See guidelines below, particularly
with concern to minimize loads on check valves.
CAUTION
Accumulated liquid in the suction header can damage
the compressor if not drained. Always drain headers
(suction and discharge headers) prior to start-ups.
Failure to comply may result in damage to equipment.
Slide Valve Actuator Installations
Instructions
CAUTION
When installing the optical slide motor, loosen locking
collar before sliding the collar down on the shaft. Do
not use a screwdriver to pry locking collar into position.

Installation

See Slide Valve Actuator Assembly Replacement in
Section 5 for installation details.

Overview

Calibration of an optical slide valve actuator is a two step
process that must be done for each actuator installed of
the compressor. Briefly, the steps are as follows.
1) The actuator motor control module, located inside
the actuator housing, is calibrated so that it knows
the minimum and maximum rotational positions of
the slide valve it controls. The calibrated actuator
will output 0 VDC at the minimum position and 5
VDC at the maximum position.
2) After the actuator motor control module has been
calibrated for 0-5Volts, the controlling channel cor-
responding to the actuator motor (either the capac-
ity or volume) has to be calibrated. This instructs
the control panel to learn the rotational 0% position
& rotational 100% position of the slide valve travel.
Because there is an optical sensor on this motor, do
not attempt calibration in direct sunlight.
VSS/VSR/VSM/VSH/VSSH Compressor • Installation, Operation and Service Manual • Emerson • 35391S
NOTE
Actuator Motor Control Module Calibration
Procedure
1. Disable the Slide Non-Movement Alarm by going to
the "Setup" menu on the control panel and choos-
ing "Alarm Disable" for the Slide Non-Movement
Option. (If applicable).
2. Completely shut off the power to the control panel
completely.
3. If not already done, mount the slide valve actuator
per ("Vilter Actuator set up for Capacity and Volume
Slide Motors). Next, wire the actuator per the at-
tached wiring diagrams, using the already installed
electrical conduit to run the cables. The old wir-
ing can be used to pull the new cables through the
conduit to the control panel. The cables may also
be externally tie-wrapped to the conduit. Run the
yellow AC power cable(s) and the gray DC position
transmitter cable(s) in different conduit. This pre-
vents the DC position transmitter cable from pick-
ing up electrical noise from the AC power cable. Do
not connect either of the cables to the actuators yet.
In addition, if the actuators are replacing old gearmo-
tors on early units, you must remove the capacitors and
associated wiring from inside the control panel. This is
necessary to prevent electrical damage to the new ac-
tuator motor.
4. When completing the calibration of the new ac-
tuators, the motors are signaled to move to below
5%. This may not completely occur when exiting
the calibration screen due to a "program timer".
HOWEVER, when the compressor actually starts,
the motors will travel below 5% and function cor-
rectly. The user may see that the actuators are not
below 5% after calibration and try to find the reason.
If the calibration screen is re-entered right away and
then exited, the timer will allow the actuator to go
below the 5% on the screen. This may be perceived
as a problem; in reality,it is not.
The 0 to 5V-position transmitter output of the
actuator will fluctuate wildly during the calibration
process. To prevent damage to the actuators, do not
connect the yellow power cable or the gray position
transmitter cable until instructed to do so later on.
5. Refer to Calibrate Slide Valve Actuators (using
Vission 20/20 or PLC) in Section 4 or Appendix F for
more details.
NOTE
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