VLT
®
Series 3500
4
Warnings against unintended start
1. The motor can be brought to a stop by means of
digital commands, bus commands, references or a
local stop, while the drive is connected to the AC line.
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. Consequently, the “Stop/Reset” stop key must
always be activated, following which data can be
modified.
3. A motor that has been stopped may start if faults
occur in the electronics of the drive, or if a temporary
overload, a fault in the supply AC line or a fault in the
motor connection clears.
4. If the “Local/Hand” key is activated and the “Local”
reference is modified, the motor can only be brought
to a stop by means of the “Stop/Reset” key.
NOTE: It is the responsibility of the user or person
installing the drive to provide proper grounding and
branch circuit protection for incoming power and motor
overload according to the 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 315 is set for
“TRIP”, parameter 311 is set of
“0”, and parameter 107 is set for rated motor (nameplate)
current.
Danfoss VLT
®
and CE Marking
Danfoss CE marks our VLT
®
Adjustable Frequency
Drives (AFD) according to the Electro Magnetic
Compatibility (EMC) Directive 89/336/EEC and Low-
Voltage Directive 73/23/EEC.
When the installation specification is followed and
shielded motor cables are used per instruction manuals
provided with the drive, we guarantee the AFD complies
with the EMC Directive 89/336/EEC. Please consult the
RFI Filter Product Manual and EMC Installation
Guidelines (175R5187).
Upon request we will issue a declaration of conformity to
the EMC and low-voltage directives. A manufacturer's
declaration for the Machinery Directive 89/392/EEC is
also available.
DANGER
!
Touching the electrical parts may be fatal - even after
the equipment has been disconnected from the AC
line. To be sure that the capacitors have fully
discharged, wait 14 minutes after power has been
removed before touching any internal component.
DANGER
!
Rotating shafts and electrical equipment can be
hazardous. Therefore, it is strongly recommended that all
electrical work conform to the National Electrical Code
and all local regulations. Installation, start-up and
maintenance should be performed only by qualified
personnel.
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 Guidlines
1. The drive must be disconnected from the AC line
before any service work is done.
2. The “Stop/Reset” key on the operating 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 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.
