Safety And Conformity; Safety Precautions - Danfoss VLT AutomationDrive 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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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.
Refer to FC 300 Operating Instructions (MG.33.A8.xx) for further safety guidelines.
The voltage of the frequency converter is dangerous whenever connected to mains.
Incorrect installation of the motor, frequency converter or fieldbus may cause dam-
age to the equipment, serious personal injury or death. Consequently, the instruc-
tions in this manual, as well as national and local rules and safety regulations, must
be complied with.
The frequency converter must be disconnected from mains if repair work is to be carried
out. Check that the mains supply has been disconnected and that the necessary time has
passed before removing motor and mains plugs.
The [STOP/RESET] key on the control panel of the frequency converter does not dis-
connect the equipment from mains and is thus not to be used as a safety switch.
Correct protective earthing of the equipment must be established, the user must be pro-
tected against supply voltage, and the motor must be protected against overload in
accordance with applicable national and local regulations.
The earth 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 mains supply while the frequency converter
is connected to mains. Check that the mains supply has been disconnected and that the
necessary time has passed before removing motor and mains plugs.
Please note that the frequency converter 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. Check that all voltage inputs have been disconnected and that the necessary
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 frequency converter is connected to mains. If per-
sonal 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; following which data can be modified.
A motor that has been stopped may start if faults occur in the electronics of the frequency
converter, or if a temporary overload or a fault in the supply mains or the motor con-
nection ceases.
Touching the electrical parts may be fatal - even after the equipment has been dis-
connected from mains.
MG.33.B9.02 - VLT ® is a registered Danfoss trademark
2. Safety and Conformity
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