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Emerson 20/20 service manual Slide Valve Actuator Troubleshooting Guide Blink Code

Models: 20/20

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Section 14 • Slide Calibration

Slide Valve Actuator Troubleshooting Guide Blink Code

Vilter actuators communicate problems discovered by the internal diagnostics to the technician by LED blink codes. Only one blink code is displayed, even though it is possible that more than one problem has been detected. The actua- tor motor will not operate until the error code is cleared by pressing the blue bottom, see Table 14-3. LED Blink Codes and Troubleshooting Guide.

Table 14-3. LED Blink Codes and Troubleshooting Guide (1 of 2)

Flash Pattern

Meaning

* = ON

- = OFF

 

 

 

*-*-*-*-*-*-*-*-*-*-*-*-

Calibration step 1.

*---*---*---*---*---*---

Calibration step 2.

 

 

This indicates a zero span. This error can only occur dur-

 

 

ing calibration. The typical cause is forgetting to move

 

 

the actuator when setting the upper limit of the span.

 

 

If this is the case, press the blue button to restart the

 

 

calibration procedure. This error can also occur if either

 

 

or both of the slotted optocouplers are not working. If

 

 

this is the case, the slide valve actuator will have to be

 

 

replaced.

 

 

The operation of the slotted optocouplers can be tested

*--*--------------------

as follows:

1. Manually rotate the motor shaft until the aluminum

 

 

photochopper fence is not blocking either of the opto-

 

 

coupler slots.

 

 

2. Using a digital multimeter, measure the DC voltage

 

 

between terminal 3 of the small terminal block and TP1

 

 

on the circuit board (see Note 1). The measurement

 

 

should be between 0.1 and 0.2 Volts.

 

 

3. Next, measure the DC voltage between terminal 3

 

 

and TP2 on the circuit board. You should measure be-

 

 

tween 0.1 and 0.2 Volts.

 

 

 

 

 

A motor over-speed occurred. At some time during

 

 

operation, the motor armature spun too fast for the

 

 

encoder to measure. A nonfunctional motor brake is

*-----------------------

usually to blame. This error means that the slide valve

actuator is no longer transmitting accurate position

 

 

information. The actuator should be recalibrated as

 

 

soon as possible, after the cause of the over-speed is

 

 

identified and corrected. This error will not clear until

 

 

the actuator is re-calibrated.

 

 

 

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.

Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153

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Emerson 20/20 Slide Valve Actuator Troubleshooting Guide Blink Code, LED Blink Codes and Troubleshooting Guide 1
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