Emerson VSG Manual Download Page 18

Page: 18 / 100

3. If not already done, mount the slide valve actua-

tor per (“Vilter Actuator set up for Capacity and
Volume Slide Motors).  Next, wire the actuator
per the attached wiring diagrams, using the
already installed electrical conduit to run the
cables.  The old wiring can be used to pull the
new  cables  through  the  conduit  to  the  con-
trol 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

prevents the DC position transmitter cable from
picking 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 gear-
motors on early units,

you must remove the capaci-

tors and associated wiring from inside the control
panel.

This is necessary to prevent electrical damage

to the new actuator motor.

4. When completing the calibration of the new

actuators,  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 com-
pressor actually starts, the motors will travel
below 5% and function correctly.  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.

5. Note: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.

6. Open the plastic cover of the capacity motor by

removing the four #10 screws.

Installation & Calibration of Slide Valve Actuators

Slide Valve Actuator Installation 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.

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 ro-
tational 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
corresponding to the actuator motor (either the
capacity 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.

PLEASE NOTE:
Because there is an optical sensor on this motor, do
not attempt calibration in direct sunlight.

ACTUATOR MOTOR CONTROL
MODULE CALIBRATION PROCEDURE

1. Disable the Slide Non-Movement Alarm by go-

ing to the “Setup” menu on the control panel
and choosing “Alarm Disable” for the Slide Non-
Movement Option. (If applicable).

2. Completely shut off the power to the control

panel completely.