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February 2020
Installation and Maintenance Instructions
MAN-02-04-99-0712-EN Rev. 1
Maintenance and Troubleshooting
Section 7: Maintenance and Troubleshooting
7.2.2 24 V DC Output Voltage not Available at the Terminals
• Switch the main power supply off and disconnect all wires from terminals 33 and 34
• Switch the main power supply on and check if the voltage on terminals 33 and 34
is between 22 and 26 V DC
• If the voltage is correct, check the external wiring and the electrical load. It should
not exceed 4 W
• If the voltage is not correct, replace the entire drive and control unit
7.2.3 The Actuator does not Work from Remote Controls
Check that:
• The wiring to terminals 32, 35 and 36 is correct
• There is no short circuit between wires
• The electrical load does not exceed 4 W
• If external voltage is used, the value has to be in the 24-120 V AC/DC range
7.2.4 The motor is Very Hot and does not Start
• Wait until the motor cools down before trying to operate the actuator again
• Check that the number of operations per hour and their duration is suitable for the
actuator service (refer to the nameplate)
• Check that the valve operating torque is within the range of the unit’s designed
operating torque
• Always check the causes of abnormal operation
7.2.5 The Motor Runs but the Actuator does not
Move the Valve
• Verify that the drive insert correctly ts in the actuator base
• Verify that the drive insert has enough engagement with the valve stem
• Verify that the key correctly ts in bore/keyway applications
• Check that the valve works in manual operation. If not, it is necessary to check the
manual control area as follows:
— Loosen the handwheel security dowel
— Remove the handwheel
— Check the integrity of the internal parts
— When proceeding with assembly, follow the reverse order of the disassembly
— Make sure there are no foreign bodies present. Take care not to damage
the O-ring seals or gaskets.
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