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VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG
*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.
Flash Pattern Meaning
*__*__*____________
The motor has overheated. The actuator motor will not run until it cools. Once
the motor cools, the actuator will resume normal operation.
Motor overheating is sometimes a problem in hot and humid environments
when process conditions demand that the slide valve 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 ther-
mal switch can be tested by measuring the DC voltage with a digital multi-meter
between the two TS1 wire pads (see Note 2). If the switch is closed (normal
operation) you will measure 0 Volts.
********************
The 24V supply is 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 be-
tween terminals 3 and 4 of the small terminal block. If the voltage is >= 24V,
replace the actuator.
_*******************
The EEPROM data is bad. This is usually caused by loss of 24V pow-
er before the calibration procedure was completed. The actuator
will not move while this error code is displayed. To clear the error,
calibrate the actuator. If this error has occurred and the cause was
not the 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. Replace the actuator.
Section 6 • Troubleshooting
Table 6-2. Slide Valve Actuator LED Blink Codes (2 of 2)