Emerson VILTER VSS Installation, Operation And Service Manual page 107

Section 6 • Troubleshooting
Table 6-2. Slide Valve Actuator LED Blink Codes (2 of 2)
Flash Pattern
* = ON - = OFF
*--*--*-----------------
*********************
-********************
*****----*--------------
*There are two versions of slide valve actuators, version A and B. Only version B is able to display LED blink codes. Slide valve actuator version B can
be distinguished by only having a single circuit board as supposed to two circuit boards in version A.
Note 1: TP1 and TP2 are plated-thru holes located close to the slotted optocouplers on the board. They are clearly marked on the board silkscreen
legend.
Note 2: The TS1 wire pads are where the motor thermal switch leads solder into the circuit board. They are clearly marked on the board silkscreen
legend and are oriented at a 45 degree angle.
VSS/VSR/VSM/VSH/VSSH Compressor • Installation, Operation and Service Manual • Emerson • 35391S
The motor is overheated. The actuator motor will not run until
it cools. Once the motor cools, the actuator will resume normal
Motor overheating is sometimes a problem in hot humid environ-
ments when process conditions demand that the slide valve actua-
tors reposition often. Solutions are available; consult your Vilter
authorized distributor for details.
Another possible cause for this error is a stuck motor thermal switch.
The thermal switch can be tested by measuring the DC voltage with
a digital multimeter be- tween the two TS1 wire pads (see Note 2). If
the switch is closed (normal operation) you will measure 0 Volts.
The 24V supply voltage is low. This will occur momentarily when the
actuator is powered up and on power down.
If the problem persists, measure the voltage using a digital multi-
meter between terminals 3 and 4 of the small terminal block. If the
voltage is less than 24V, the problem is in the supply to the board.
If the voltage is >= 24V, replace the actuator.
The EEPROM data is bad. This is usually caused by loss of 24V power
before the calibration procedure was completed. The actuator will
not move while this error code is being displayed. To clear the error,
calibrate the actuator. If this error has occurred and the cause was not
loss of 24V power during calibration, possible causes are:
1. The EEPROM memory in the micro-controller is bad.
2. The large blue capacitor is bad or has a cracked lead.
Micro-controller program failure. Please notify your Vilter
Meaning
operation.
rized distributor.
TM
autho-
TM
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