Emerson 20/20 service manual LED Blink Codes and Troubleshooting Guide 2

Section 14 • Slide Calibration

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

Flash Pattern		Meaning
* = ON	- = OFF
		The motor is 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
		humid environments when process conditions demand
*--*--*-----------------		that the slide valve actuators 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 momen-
		tarily when the actuator is powered up and on power
		down.
*********************		If the problem persists, measure the voltage using a
		digital multimeter 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 com-
-********************		pleted. The actuator will not move while this error code
		is being displayed. To clear the error, calibrate the actua-
		tor. If this error has occurred and the cause was not loss
		of 24V power during calibration, the EEPROM memory
		is bad and the actuator will need to be replaced.
*****----*--------------		Microcontroller program failure. Please notify your
		Vilter authorized distributor.

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° angle.

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