Danfoss VLT 5000 Instruction Manual page 3

Rotating shafts and electrical equipment can
be hazardous. Therefore, it is strongly
recommended that all electrical work conform
to the 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 components.
Always work with another person in case of an emergency.
Disconnect power whenever possible 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
Touching electrical parts may be fatal – even after equipment has been
disconnected from AC line. To be sure that capacitors have fully dis-
charged, wait 14 minutes after power has been removed before touching
any internal component.
2
VLT ® 5000 / VLT ® 6000
does not disconnect the equipment from the AC line and
is not to be used as a safety switch.
3. Correct protective grounding of the equipment must be
established. The user must be protected 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 unintended 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:
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) is UL listed. VLTs provide
Class 20 motor overload protection in accordance with the
NEC in single motor applications, when VLT
parameter 117 (VLT 5000 parameter 128) is set for ETR Trip 1
and parameter 105 is set for rated motor (nameplate) current.
MG.60.N1.22 - VLT is a registered Danfoss trademark
HVAC / VLT ® 8000 AQUA
6000/8000