10.8 - Variable frequency drive maintenance
WARNING: Before any work on the variable frequency drive,
ensurethatthecircuitbreaker/disconnectswitchisopenand
there is no voltage present (reminder: The capacitors take
approximately 20 minutes to discharge. This value is a guide,
and may differ from one VFD to another: Refer to the
informationgivenontheVFDtondouttheprecisevalue).
Only appropriately qualied personnel are authorised to
replace or make modications to components inside the
variable frequency drive.
During periodic inspections, check the condition of the ventilation
grilles on the variable frequency drive door; ensure that they are
not pierced, damaged or obstructed.
Replace the fan if a "fan replacement" alert/warning is displayed
in the list of alarms.
For any other alarm or problem relating to the variable frequency
drive, contact Carrier Service
In general, a fault with the variable frequency drive can be
corrected by repairing or replacing an internal component. If the
complete variable frequency drive needs to be replaced, its
removal will require prior removal of the ventilation ducts and the
top of the cabinet: Please contact Carrier Service. Similarly,
precautions must be taken for handling, as the variable frequency
drives are very heavy (between 65kg and 120kg, depending on
their size).
The variable frequency drives tted on the units do not require a
dielectric test, even if being replaced: They are systematically
checked before delivery. Moreover, the ltering components
installed in the variable frequency drive can falsify the measurement
and may even be damaged.
If the insulation of a component (compressor, cables, etc.) requires
testing, the variable frequency drive must be disconnected from
the power circuit.
10.9 - Precautions when tting the casing panel
to the side of the control cabinet
The control cabinet casing panel may need to be removed to
access the back of the internal partition which houses the electrical
components. In this case, precautions must be taken when retting
to ensure the panel is not deformed:
The upper section of the casing panel is equipped with a hook
which must be engaged in the cabinet's frame: Before it is screwed
in, the panel should stay in place on the cabinet by itself, and
assembly should not require a second person to be present.
IMPORTANT : If the panel is deformed, it would irreparably
damage the sealing of the cabinet, which would enable water
drops to inltrate the cabinet and degrade the electrical
components.
10 - SYSTEM STANDARD MAINTENANCE
60
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