Overview
VFDB-SVX001A-EN
11
Control Voltage Power De-
energization
Note:
For questions regarding these procedures, contact
your local Trane or Rockwell office.
•
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 6000T 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
circuit and may cause harm or injury to the person
working on the equipment.
•
If the primary and secondary control voltage sources
are not de-energized during the work, you must
continue to use your PPE while performing the work.
Back-feed Sources of Hazardous
Electrical Energy
Note:
For questions regarding these procedures, contact
your local Trane or Rockwell office.
•
Back-feed power caused by a fan that rotates from
ambient wind blowing on it, electric motor(s) rotating
when equipment manually moves it and other
potential sources of back-feed power may be
downstream from the MV cabinet.
–
Identify sources of potential back-feed power
downstream from the MV cabinet.
–
Prevent back-feed power by locking, blocking or by
other measures to positively control back-feed
power sources.
•
Verify these sources are positively controlled to
prevent back-feed.
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical hazards,
MUST follow precautions in this manual and on the
tags, stickers, and labels, as well as the following
instructions: Unless specified otherwise, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be
inadvertently energized. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been trained in
handling live electrical components perform these
tasks.
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical hazards,
MUST follow precautions in this manual and on the
tags, stickers, and labels, as well as the following
instructions: Unless specified otherwise, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be
inadvertently energized. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been trained in
handling live electrical components perform these
tasks.
