Safety - Danfoss VLT AutomationDrive FC 302 Programming Manual

Introduction
1 1

1.4 Safety

WARNING
The voltage of the frequency converter is dangerous
whenever connected to mains. Incorrect installation of
the motor, frequency converter or fieldbus 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 mains supply to the frequency
converter whenever repair work is to be carried
out. Check that the mains supply has been
disconnected and that the necessary time has
elapsed before removing motor and mains supply
plugs.
2. [Off] does not disconnect the mains supply and
consequently, it must not be used as a safety
switch.
3. Ground the equipment properly, protect the user
against supply voltage and protect the motor
against overload in accordance with applicable
national and local regulations.
4. The earth leakage current exceeds 3.5 mA. Ensure
the correct grounding of the equipment by a
certified electrical installer.
5. Do not remove the plugs for the motor and
mains supply while the frequency converter is
connected to mains. Check that the mains supply
has been disconnected and that the necessary
time has elapsed before removing motor and
mains plugs.
6. The frequency converter has more voltage
sources than L1, L2 and L3, when load sharing
(linking of DC intermediate circuit) or external 24
V DC is installed. Check that all voltage sources
have been disconnected and that the necessary
time has elapsed before commencing repair work.
Warning against unintended start
1. The motor can be stopped with digital
commands, bus commands, references or a local
stop, while the frequency converter is connected
to mains. These stop functions are not sufficient
to prevent unintended motor start and thus
prevent personal injury caused by, e.g., contact
with moving parts. To consider personal safety,
disconnect the mains supply or activate the Safe
Torque Off function.
2. The motor may start while setting the
parameters. Prevent the motor from starting, for
instance, by use of the Safe Torque Off function
or secure disconnection of the motor connection.
6
®
VLT AutomationDrive FC 301/302
NOTICE
When using the Safe Torque Off, always follow the
instructions in Safe Torque Off Operating Instructions for
Danfoss VLT
High Voltage
Touching the electrical parts may be fatal - even after
the equipment has been disconnected from mains.
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 back-up.
Systems where frequency converters are installed must,
if necessary, be equipped with additional monitoring
and protective devices according to the valid safety
regulations, e.g. law on mechanical tools, regulations for
the prevention of accidents etc. Modifications on the
frequency converters by means of the operating
software are allowed.
NOTICE
Hazardous situations must be identified by the machine
builder/integrator who is responsible for taking
necessary preventive means into consideration.
Additional monitoring and protective devices may be
included, always according to valid national safety
regulations, e.g. law on mechanical tools, regulations for
the prevention of accidents.
Danfoss A/S © Rev. 10/2014 All rights reserved.
3. A motor that has been stopped with the mains
supply connected, may start if faults occur in the
electronics of the frequency converter, through
temporary overload, or if a fault in the power
supply grid or motor connection is remedied. If
unintended start must be prevented for personal
safety reasons (e.g. risk of injury caused by
contact with moving machine parts), the normal
stop functions of the frequency converter are not
sufficient. In such cases, disconnect mains supply
or activate Safe Torque Off.
®
Frequency Converters.
4. Control signals from, or internally within, the
frequency converter may in rare cases be
activated in error, be delayed or fail to occur
entirely. When used in situations where safety is
critical, e.g. when controlling the electromagnetic
brake function of a hoist application, these
control signals must not be relied on exclusively.
WARNING
MG33MJ02