Installation, Operation and Maintenance Manual
MAN-10-04-100-0711-EN Rev. 0
October 2020
41
Maintenance and Troubleshooting
Section 7: Maintenance and Troubleshooting
NOTE
Special maintenance is also recommended when, during operations, the actuator
generates an excessive noise.
7.2 Troubleshooting
All Keystone EPI2 actuators have passed the functional test performed by Emerson
Quality Assurance personnel.
If the actuator does not work, before troubleshooting make sure that:
• The main supply is the same as stated in the name plate menu
• The green LED for available power supply is switched on
• Power supply is available to the actuator and no protective device has declutched
in the plant
• Check the position of the dip switch SW3; it must be ‘1’
7.2.1 The Electronics do not Switch on When Powered
• Check that the value of the main voltage on terminals L1 and L2
(and in the same case L3) is correct
• Remove the cover assembly
• Check the continuity of the wires between terminals L1, L2, L3 and the connector
of the power card
• If there is no continuity on the L1-L2-L3 cables, replace the terminal board
• If continuity on the L1, L2, L3 cables is ok, replace the entire drive and control unit
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
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