2
MG.10.P2.22
VLT is a registered Danfoss trade mark
DANGER
!
Rotating shafts and electrical equipment can
be hazardous. Perform all electrical work in
conformance with the National Electrical Code
(NEC) and all local regulations. Installation,
star t-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
does not disconnect the equipment from the AC line
and is not to be used as a safety switch.
Touching electrical parts may be fatal – even after equipment has
been disconnected from AC line. To be sure that capacitors have
fully discharged, wait 14 minutes for 220 and 500 V units, wait 30
minutes for 550-600 V units after power has been removed before
touching any internal component.
DANGER
!
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 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.
