Emerson VSS, VSR, VSM service manual Slide Valve Actuator Installation & Calibration

Slide Valve Actuator Installation & Calibration

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.

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 going 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.

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 attached wiring diagrams, using the already installed electri- cal conduit to run the cables. The old wiring 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 prevents 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 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 compressor actually starts, the motors will travel below 5% and function correctly. The user may see that the actua- tors 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.

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