Overview
10
AFDJ-SVU01D-EN
Important:
•
Before servicing, disconnect all power sources and
allow at least 40 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 7000 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.
Control Voltage Power De-
energization
•
Wear the PPE that is necessary to protect from the
shock and arc flash hazards.
•
Disconnect the control voltage. Apply the lockout
lock(s) and/or the tagout device(s).
•
Identify the PowerFlex 7000 cabinet control power
supply.
–
The source may be a disconnect switch on an
electric circuit, an input contactor mounted on the
side of the cabinet or similar power disconnect
device.
–
Identify other sources of control voltage by
reviewing the system drawings and looking at the
equipment for secondary power sources.
•
Some cabinets are equipped with a UPS battery
backup 120 volt AC power supply for control voltage.
–
The control voltage from the UPS battery backup
will not be de-energized by disconnecting the
control voltage disconnect switch. It is designed to
energize once the primary control voltage source is
de-energized.
–
Use the PPE necessary to protect against UPS
power.
•
Use a properly rated meter to verify the control voltage
power on the downstream side of the disconnect
device is de-energized.
•
Place the control voltage from the Rockwell
Automation installed circuit breaker on the panel
inside the control voltage supply cabinet in the “off”
position.
–
The circuit breakers are normally located at the
bottom of the circuit breaker terminal block strip.
–
Lockout-Tagout the switch. If a lockout is not
feasible then tagout the circuit breaker to warn
other people working in the same area not to turn
the switch back on as it will re-energize the control
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing 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. Verify with an appropriate voltmeter that all
capacitors have discharged. If this equipment is
interlocked with other equipment, 115 volt AC may be
present in the cabinet even though the main power is
disconnected. If this is the case, these interlock signals
should be deactivated before any work is performed on
this equipment. Suitable warning tags or disconnects
should be added to these circuits and all circuits should
be tested before attempting to energize or service the
controller.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06*-EN
WARNING
Capacitors Must be Allowed to
Discharge!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious injury.
Each time power is removed, allow at least 40 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.
WARNING
Read and Understand All Safety
Procedures in this Manual!
Failure to read and understand the following
information could result in death or serious injury. The
information contained in this section of the manual is
very important. It describes safety procedures that
MUST be followed. For your safety you MUST read and
understand them. If you have any questions, please
contact your local Trane/Rockwell office.
