Introduction To Vlt ® Hvac Drive; Safety - Danfoss VLT FC 102 Series Design Manual

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

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 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
elapsed 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. Established correct protective grounding of the
equipment, protect the user against supply
voltage, and protect the motor 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 elapsed before
removing motor and line power plugs.
12
Design Guide
®
HVAC Drive
Installation at high altitudes
380–500 V, enclosure types A, B and C: At altitudes
above 6,600 ft [2 km], contact Danfoss regarding PELV.
525–690 V: At altitudes above 6,600 ft [2 km], 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.
Danfoss A/S © Rev. 06/2014 All rights reserved.
7. 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 discon-
nected and that the necessary time has passed
before commencing repair work.
CAUTION
WARNING
1. The motor can be stopped with 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 [Reset] key 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 line power or the motor connection
ceases.
WARNING
MG11BC22