VLT
®
6000 HVAC
3
MG.60.G2.02 - VLT is a registered Danfoss Trademark
Rotating shafts and electrical equipment
can be hazardous. Therefore, it is strongly
recommended that all electrical work con-
form to National Electrical Code (NEC) and all local
regulations. Installation, start-up and maintenance
should be performed only by qualified personnel.
Factory recommended procedures, included in this
manual, should be followed. Always disconnect
electrical power before working on the unit.
Although shaft couplings or belt drives are generally
not furnished by the manufacturer, rotating shafts,
couplings and belts must be protected with securely
mounted metal guards that are of sufficient thickness
to provide protection against flying particles such as
keys, bolts and coupling parts. Even when the motor
is stopped, it should be considered “alive” as long as
its controller is energized. Automatic circuits may
start the motor at any time. Keep hands away from
the output shaft until the motor has completely
stopped and power is disconnected from the
controller.
Motor control equipment and electronic controls are
connected to hazardous line voltages. When
servicing drives and electronic controls, there will be
exposed components at or above line potential.
Extreme care should be taken to protect against
shock. Stand on an insulating pad and make it a
habit to use only one hand when checking compo-
nents. Always work with another person in case of
an emergency. Disconnect power whenever pos-
sible to check controls or to perform maintenance.
Be sure equipment is properly grounded. Wear safety
glasses whenever working on electric control or
rotating equipment.
Safety Guidelines
1. The drive must be disconnected from the AC
line before any service work is done.
2. The “Stop/Off” key on the local control panel
of the drive does not disconnect the equip-
ment from the AC line and is not to be used
as a safety switch.
■■
■■
■ Safety
3. Correct protective grounding of the equipment
must be established. The user must be protec-
ted against supply voltage and the motor must
be protected against overload in accordance
with applicable national and local regulations.
4. Ground currents are higher than 3 mA.
Warnings Against Unintended Start
1. While the drive is connected to the AC line, the
motor can be brought to a stop by means of
external switch closures, serial bus commands
or references. If personal safety considerations
make it necessary to ensure that no unin-
tended start occurs, these stops are not
sufficient.
2. During programming of parameters, the motor
may start. Be certain that no one is in the area
of the motor or driven equipment when
changing parameters.
3. A motor that has been stopped may start
unexpectedly if faults occur in the electronics
of the drive, or if an overload, a fault in the
supply AC line or a fault in the motor
connection or other fault clears.
4. If the “Local/Hand” key is activated, the motor
can only be brought to a stop by means of the
“Stop/Off” key or an external safety interlock
NOTE:NOTE:
NOTE:NOTE:
NOTE:
It is responsibility of user or person installing
drive to provide proper grounding and branch
circuit protection for incoming power and motor
overload according to National Electrical Code (NEC)
and local codes.
The Electronic Thermal Relay (ETR) in UL listed
VLTs provides Class 20 motor overload protection
in accordance with NEC in single motor applica-
tions, when parameter 117 is set for ETR TRIP 1,
ETR TRIP 2, ETR TRIP 3, or ETR TRIP 4, and
parameter 105 is set for rated motor
(nameplate) current.
To Next Page
Loading...
Need help?
General
