Safety Guidelines; Warnings Against Unintended Start - Danfoss VLT 6002-6011 Installation, Operation And Maintenance Manual

DANGER
!
Rotating shafts and electrical equipment can
be hazardous. Therefore, it is strongly
recommended that all electrical work conform
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 consid-
ered "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 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.
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 after power has been removed
before touching any internal component.
2

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.
3. Correct protective grounding of the equipment must be estab-
lished. 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.
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
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.
DANGER
!
NOTE