Overview
10
VFDB-SVX001A-EN
PowerFlex 6000T Medium Voltage Cabinet
Medium Voltage Power De-energization
Drive, Disconnect, or Breaker
•
Put on the Personal Protective Equipment (PPE)
necessary to protect from the shock and arc flash
hazards from both medium and control voltages.
•
Disconnect the MV input power source to the
PowerFlex 6000T drive cabinets by placing the drive
control; disconnect handle or circuit breaker switch in
the “off” position.
–
Apply the Lockout-Tagout device(s) and lock(s).
–
The drive cabinet doors are locked and the input
power control box must remain closed when de-
energizing the MV power source.
•
Placing the control, handle or switch in the “Off”
position should de-energized the power only
down stream from the cabinet.
•
Medium voltage power remains energized
upstream of the control, handle or switch.
•
Use a properly rated meter to verify the medium
voltage power on the downstream side of the drive/
disconnect/breaker is de-energized.
–
Follow meter test procedures to confirm the meter
is reading accurately prior to verifying de-
energization.
Important:
•
Before servicing, disconnect all power sources and
allow at least 20 minutes for capacitors to discharge.
•
All electrical enclosures-unit or remote-are IP2X.
•
Remove the key from the de-energized drive/
disconnect/breaker and use the key control procedure
to open the MV cabinet access door(s).
•
Use a medium voltage rated Potential Indicator tool
(“hot stick”) to confirm the medium voltage power
inside the PowerFlex 6000T cabinet is de-energized.
–
Follow Potential Indicator tool test procedures to
confirm the tool is working properly prior to
verifying de-energization.
•
The PPE for medium voltage safety can only be
removed once the MV power de-energization is
verified and confirmed. The PPE for control voltage can
only be removed once the control voltage de-
energization is verified.
WARNING
Hazardous Voltage w/Capacitors!
Failure to follow instructions below could result in
death or serious injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. For variable frequency drives
or other energy storing components provided by Trane
or others, refer to the appropriate manufacturer’s
literature for allowable waiting periods for discharge of
capacitors.
If this equipment is interlocked with other equipment,
115 volt AC may be present in the cabinet even though
the main power is disconnected. Interlock signals must
be deactivated by qualified personnel prior to any work
in the cabinet.
Verify with an appropriate voltmeter that all capacitors
have discharged, and interlock signals have been
deactivated from all circuits.
WARNING
Capacitors Must be Allowed to
Discharge!
Failure to follow instructions below could result in
death or serious injury.
Each time power is removed, allow at least 20 minutes
for DC units to discharge after power is disconnected
before servicing. Use extreme caution when applying
power. Equipment terminals and other internal parts of
the controller are at line voltage when ac power is
connected to the controller. All ungrounded conductors
of the ac power line must be disconnected from the
controller before it is safe to touch any internal parts of
this equipment.
