Safety And Conformity; Safety Precautions - Danfoss FC 300 Design Manual

FC 300 Design Guide

2 Safety and Conformity

2.1 Safety Precautions

2.1.1 Safety Precautions
The voltage of the frequency converter is dangerous whenever connected to mains. Incorrect installation of the motor, frequency
converter or fieldbus may cause damage to the equipment, serious personal injury or death. Consequently, the instructions in this
manual, as well as national and local rules and safety regulations, must be complied with.
Safety Regulations
1. The mains supply to the frequency converter must be disconnected 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. The [OFF] button on the control panel of the frequency converterr does not disconnect the mains supply and consequently it must not be used
as a safety switch.
3. The equipment must be properly earthed, 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 earth leakage current exceeds 3.5 mA.
5. Protection against motor overload is not included in the factory setting. If this function is desired, set par. 1-90
data value ETR trip 1 [4] or data value ETR warning 1 [3].
6. 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.
7. Please note that 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 are 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 brought to a stop by means of digital commands, bus commands, references or a local stop, while the frequency converter
is connected to mains. If personal safety considerations (e.g. risk of personal injury caused by contact with moving machine parts following an
unintentional start) make it necessary to ensure that no unintended start occurs, these stop functions are not sufficient. In such cases the mains
supply must be disconnected or the
2. The motor may start while setting the parameters. If this means that personal safety may be compromised (e.g. personal injury caused by
contact with moving machine parts), motor starting must be prevented, for instance by use of the
of the motor connection.
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 the mains supply must be disconnected or the
NB!
Safe Stop
When using the
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.
Touching the electrical parts may be fatal - even after the equipment has been disconnected from mains.
Safe Stop
function must be activated.
function, always follow the instructions in the
MG.33.BC.02 - VLT ® is a registered Danfoss trademark
Safe Stop
Safe Stop function must be activated.
Safe Stop
section of the VLT AutomationDrive Design Guide.
2 Safety and Conformity
Motor Thermal Protection
to
function or secure disconnection
2
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