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Section 6 • Troubleshooting
Slide Valve Actuators communicate problems discovered by internal diagnostics via LED blink codes. Only one blink
code is displayed, even though it is possible that more than one problem has been detected.
Table 6-2. Slide Valve Actuator LED Blink Codes* (1 of 2)
Flash Pattern
* = ON - = OFF
*-*-*-*-*-*-*-*-*-*-*-*-
*---*---*---*---*---*---
*--*--------------------
*-----------------------
6 – 4
This indicates a zero span. This error can only occur during 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
The operation of the slotted optocouplers can be tested as follows:
1. Manually rotate the motor shaft until the aluminum photo-chopper
fence is not blocking either of the optocoupler slots.
2. Using a digital multimeter, measure the DC voltage between termi-
nal 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.
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 cor-
rected. This error will not clear until the actuator is re-calibrated.
1. The motor speed exceeding the position sensors ability to measure
it at some time during operation. A non-functioning motor brake is
2. The actuator is being operated where strong infrared light can
falsely trigger the slotted optocouplers, such as direct sunlight. Shade
the actuator when the cover is off for service and calibration. Do not
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
Meaning
Calibration step 1.
Calibration step 2.
slide valve actuator will have to be replaced.
This code can be caused by:
usually to blame.
operate the actuator with the cover off.
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Table of Contents
Troubleshooting
