1.1.5 Special Conditions
Electrical ratings:
The rating indicated on the nameplate of the frequency
converter is based on a typical 3-phase mains power supply,
within the specified voltage, current and temperature range,
which is expected to be used in most applications.
The frequency converters also support other special
applications, which affect the electrical ratings of the
frequency converter.
Special conditions which affect the electrical ratings might
be:
•
Single phase applications
•
High temperature applications which require de-
rating of the electrical ratings
•
Marine applications with more severe environ-
mental conditions.
Other applications might also affect the electrical ratings.
Consult the relevant sections in this manual and in the
VLT
®
HVAC Drive Design Guide, MG.11.BX.YY
for information about
the electrical ratings.
Installation requirements:
The overall electrical safety of the frequency converter
requires special installation considerations regarding:
•
Fuses and circuit breakers for over-current and
short-circuit protection
•
Selection of power cables (mains, motor, brake,
loadsharing and relay)
•
Grid configuration (grounded delta transformer
leg, IT,TN, etc.)
•
Safety of low-voltage ports (PELV conditions)
Consult the relevant clauses in these instructions and in the
VLT
®
HVAC Drive Design Guide for information about the
installation requirements.
1.1.6 Installation at High Altitudes (PELV)
WARNING
Hazardous Voltage!
By altitudes above 2km, please contact Danfoss regarding
PELV.
Avoid un-intended start
While the frequency converter is connected to mains, the
motor can be started/stopped using digital commands, bus
commands, references or via the LCP.
•
Disconnect the frequency converter from mains
whenever personal safety considerations make it
necessary to avoid unintended start.
•
To avoid unintended start, always activate the
[OFF] key before changing parameters.
•
Unless terminal 37 is turned off, an electronic fault,
temporary overload, a fault in the mains supply, or
lost motor connection may cause a stopped motor
to start.
Failure to follow recommendations could result in death or
serious injury.
Safety
VLT
®
HVAC Drive Native BACnet Operating Instructions
4
MG.14.C1.02 - VLT
®
is a registered Danfoss trademark
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