
Section 6 • Troubleshooting
Table 6-2. Slide Valve Actuator LED Blink Codes (2 of 2)
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. | |
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| 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 | |
| between the two TS1 wire pads (see Note 2). If the switch is closed (normal | |
| operation) you will measure 0 Volts. | |
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| |
| 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 | |
| tween terminals 3 and 4 of the small terminal block. If the voltage is >= 24V, | |
| replace the actuator. | |
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| |
| 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 |
| 2. | The large blue capacitor is bad or has a cracked lead. |
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*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
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.
6 – 4 | VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG |