Rockwell Automation 1519 MV DRIVE HARMONIC FILTER PF CORRECTION UNIT - Manual (Page 26)

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7-2 Troubleshooting and Repair
Troubleshooting (cont.) 592 Thermal Overload Relay
If a 592 thermal overload relay has tripped this indicates that an excessive
current has occurred in the harmonic filter. An overload condition means that
the reactor and/or the capacitors in the filter have been subjected to a current
higher than they were designed for. Some investigation should be carried out
to determine why the overload occurred. An overload could occur if excessive
harmonic currents are present due to non-linear loads other than the drive it
was designed for. The heater element sizing should be confirmed with Rockwell
Automation to make sure that it coincides with the reactor current. Nuisance
tripping could result if the heater elements are undersized for the particular filter.
Component Replacement If any damaged components are discovered, check your customized parts list
Instructions or see Chapter 8 (Renewal Parts) to determine the appropriate replacement
part. See page 1 for parts supply contacts. Generally, all components are
easily accessible and simply require removal of cables and mounting hardware.
Make sure to label wire and cable terminations before disconnecting and
properly torque power connections when reassembling per page 5-1. The
following are some specific details to note regarding certain components:
ATTENTION:
Damaged components must be replaced with
those bearing the same part number or equivalent. Failure to use
correct replacement parts, or to follow the specified replacement
guidelines, may result in equipment damage or poor equipment
performance.
ATTENTION:
Ensure main power has been disconnected and
locked out before replacing any components. Verify with a hot
stick or meter that all circuits are voltage-free. Failure to do so
may result in electric shock causing severe burns, injury or death.
Current Transformers
The orientation is important for proper current sensing. Make sure the
replaced unit is physically oriented the same way as the others in the grouping
as indicated by the position of the control wire terminals. You will need to
disconnect the power cable associated with the particular current transformer at
one end as well as the control wires from the Bul. 592 overload relay in order
to remove the unit being replaced.