Introduction To Vlt ® Hvac Drive; Safety - Danfoss VLT HVAC Drive FC 100 Series Design Manual

Introduction to VLT® HVAC D...
2 Introduction to VLT

2.1 Safety

2.1.1 Safety Note
WARNING
The voltage of the Adjustable frequency drive is dangerous
whenever connected to line power. Incorrect installation of
the motor, Adjustable frequency drive or serial communi-
cation 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. The Adjustable frequency drive must be discon-
nected 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 [STOP/RESET] key on the LCP of the
Adjustable frequency drive 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 [ETR trip] (default value) or data value [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.
6. 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 passed before
removing motor and line power plugs.
®
VLT HVAC Drive Design Guide
®
HVAC Drive
Installation at high altitudes
380–500 V, enclosure A, B and C: At altitudes above 6,561
ft , please contact Danfoss regarding PELV.
380–500 V, enclosure D, E and F: At altitudes above 9,842
ft , please contact Danfoss regarding PELV.
525–690 V: At altitudes above 6,561 ft [2 km], please
contact Danfoss regarding PELV.
Warning against Unintended Start
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
disconnected, such as external 24 V DC, load sharing
(linkage of DC intermediate circuit), as well as the motor
connection for kinetic backup. Refer to the instruction
manual for further safety guidelines.
MG11BB22 - VLT ® is a registered Danfoss trademark
7. Please note that the Adjustable frequency drive
has more voltage inputs than L1, L2 and L3,
when load sharing (linking of DC intermediate
circuit) and external 24 V DC have been installed.
Make sure that all voltage inputs have been
disconnected and that the necessary time has
passed before commencing repair work.
CAUTION
WARNING
1. The motor can be brought to a stop by means of
digital commands, bus commands, references or
a local stop, while the Adjustable frequency drive
is connected to line power. If personal safety
considerations make it necessary to ensure that
no unintended start occurs, these stop functions
are not sufficient.
2. While parameters are being changed, the motor
may start. Consequently, the stop key [STOP/
RESET] must always be activated, after which data
can be modified.
3. 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 supply line power or the motor
connection ceases.
WARNING
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