Product Overview; Safety - Danfoss VLT HVAC Basic Drive FC 101 Design Manual

Product Overview

2 Product Overview

2.1 Safety

2.1.1 Safety Note
WARNING
DANGEROUS VOLTAGE
The voltage of the adjustable frequency drive is
dangerous whenever connected to line power. Incorrect
installation of the motor, adjustable frequency drive or
serial communication bus may cause death, serious
personal injury or damage to the equipment.
Consequently, the instructions in this manual, as well as
national and local rules and safety regulations, must be
complied with.
Safety Regulations
1. Disconnect the adjustable frequency drive from
line power if repair work is to be carried out.
Make sure that the line power supply has been
disconnected and that the necessary time has
passed before removing motor and line power
plugs.
2. The [Off/Reset] key does not disconnect the
equipment from line power and is thus 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. The ground leakage currents are higher than
3.5 mA.
5. Protection against motor overload is set by
1-90 Motor Thermal Protection. If this function is
desired, set 1-90 Motor Thermal Protection to data
value [4], [6], [8], [10] ETR trip] or data value [3],
[5], [7], [9] ETR warning.
Note: The function is initialized at 1.16 x rated
motor current and rated motor frequency. For the
North American market: The ETR functions
provide class 20 motor overload protection in
accordance with NEC.
MG18C522
Design Guide
Safety Regulations
6.
7.
Installation at high altitudes
CAUTION
At altitudes above 6,600 ft [2 km], contact Danfoss
regarding PELV.
WARNING
UNINTENDED START
1.
2.
3.
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.
Danfoss A/S © Rev. 2014-01-14 All rights reserved.
Do not remove the plugs for the motor and line
power supply while the adjustable frequency
drive is connected to line power. Make sure that
the line power supply has been disconnected and
that the necessary time has elapsed before
removing motor and line power plugs.
Check that all voltage inputs have been discon-
nected and that the necessary time has elapsed
before commencing repair work.
The motor can be brought to a stop with digital
commands, bus commands, references or a
local stop, while the adjustable frequency drive
is connected to line power. These stop
functions are not sufficient to avoid unintended
start and thus prevent personal injury.
While parameters are being changed, the motor
may start. Consequently, always activate the
stop key [Off/Reset] before modifying data.
A motor that has been stopped may start if
faults occur in the electronics of the adjustable
frequency drive, or if a temporary overload or a
fault in the line power or the motor connection
ceases.
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