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

FC 300 Design Guide

2. Safety and Conformity

2.1. Safety Precautions

Safety Regulations
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Warning against Unintended Start
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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 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 followed.
The adjustable frequency drive must be disconnected from line power if repair work is
to be carried out. Make sure that the line supply has been disconnected and that the
necessary time has passed before removing motor and line plugs.
The [STOP/RESET] key on the control panel of the adjustable frequency drive does not
disconnect the equipment from line power and is thus not to be used as a safety switch.
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.
The ground leakage currents are higher than 3.5 mA.
Protection against motor overload is not included in the factory setting. If this function
is desired, set par. 1-90 to data value ETR trip or data value ETR warning.
Do not remove the plugs for the motor and line supply while the adjustable frequency
drive is connected to line power. Make sure that the line supply has been disconnected
and that the necessary time has passed before removing motor and line plugs.
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 neces-
sary time has passed before commencing repair work.
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.
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.
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 or the motor
connection ceases.
Touching the electrical parts may be fatal - even after the equipment has been dis-
connected from line power.
MG.33.B9.22 - VLT ® is a registered Danfoss trademark.
2. Safety and Conformity
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