1 Quick Guide
1.1 Safety
1.1.1 Warnings
WARNING
HIGH VOLTAGE!
Adjustable frequency drives contain high voltage when
connected to AC line power. Installation, start-up, and
maintenance should be performed by qualified personnel
only. Failure to perform installation, start-up, and
maintenance by qualified personnel could result in death
or serious injury.
High Voltage
Adjustable frequency drives are connected to hazardous
AC line voltage. Extreme care should be taken to protect
against shock. Only trained personnel familiar with
electronic equipment should install, start, or maintain this
equipment.
Touching the electrical parts may be fatal - even after the
equipment has been disconnected from line power. Also
make sure that other voltage inputs have been discon-
nected (linkage of DC intermediate circuit). Be aware that
there may be high voltage on the DC link even when the
LEDs are turned off. Before touching any potentially live
parts of the adjustable frequency drive, wait at least 4
minutes for all M1, M2 and M3 sizes. Wait at least 15
minutes for all M4 and M5 sizes.
WARNING
UNINTENDED START!
When the adjustable frequency drive is connected to AC
line power, the motor may start at any time. The
adjustable frequency drive, motor, and any driven
equipment must be in operational readiness. Failure to be
in operational readiness when the adjustable frequency
drive is connected to AC line power could result in death,
serious injury, equipment, or property damage.
Unintended Start
When the adjustable frequency drive is connected to the
AC line power, the motor may be started by means of an
external switch, a serial bus command, an input reference
signal, or a cleared fault condition. Use appropriate
cautions to guard against an unintended start.
Leakage Current (>3.5mA)
Follow national and local codes regarding protective
grounding of equipment with a leakage current > 3.5mA.
technology implies high frequency switching at high
power. This will generate a leakage current in the ground
connection. A fault current in the at the output power
terminals might contain a DC component which can
charge the filter capacitors and cause a transient ground
current. The ground leakage current depends on various
system configurations including RFI filtering, shielded
motor cables, and power.
EN/IEC61800-5-1 (Power Drive System Product Standard)
requires special care if the leakage current exceeds 3.5mA.
Grounding must be reinforced in one of the following
ways:
•
Ground wire of at least 10mm
2
.
•
Two separate ground wires both complying with
the dimensioning rules.
See EN 60364-5-54 § 543.7 for further information.
Using RCDs
Where residual current devices (RCDs), also known as
ground leakage circuit breakers (ELCBs), are used, comply
with the following:
Use RCDs of type B only which are capable of
detecting AC and DC currents.
Use RCDs with an inrush delay to prevent faults
due to transient ground currents.
Dimension RCDs according to the system configu-
ration and environmental considerations.
Motor Thermal Protection
Motor overload protection is possible by setting Parameter
1-90 Motor thermal protection to the value ETR trip. For
the North American market: Implemented ETR function
provide class 20 motor overload protection, in accordance
with NEC.
Installation at High Altitudes
For altitudes above 6,600 feet [2 km], please contact
Danfoss regarding PELV.
1.1.2
Safety Instructions
•
Make sure the adjustable frequency drive is
properly grounded.
•
Do not remove AC line input connections, motor
connections or other power connections while
the adjustable frequency drive is connected to
line power.
Quick Guide
VLT
®
Micro Drive Quick Guide
MG02B722 - VLT
®
is a registered Danfoss trademark 1-1
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