1 Safety
1.1 Safety
When reading this manual you will come across different
symbols that require special attention. The symbols used
are the following:
NOTE
Indicates something to be noted by the reader
CAUTION
Indicates a general warning
WARNING
Indicates a high voltage warning
The examples and diagrams in this manual are included
solely for illustrative purposes. The information contained
in this manual is subject to change at any time and
without prior notice. In no event will responsibility or
liability be accepted for direct, indirect or consequential
damages resulting from the use or application of this
equipment.
NOTE
Before changing any parameter settings, ensure that the
current parameter set is saved to an internal file. Refer to
MCD 500 Operating Instructions, MG.17.KX.YY, for more
information.
WARNING
WARNING - ELECTRICAL SHOCK HAZARD
MCD 500 soft starters contain dangerous voltages when
connected to mains voltage. Only a competent electrician
should carry out the electrical installation. Improper instal-
lation of the motor or the soft starter may cause
equipment failure, serious injury or death. Follow this
manual and local electrical safety codes.
Models MCD5-0360C - MCD5-1600C: The bus bar and
heatsink are live while the unit is operating (starting,
running or stopping). If the starter is installed without a
main contactor, the bus bar and heatsink are live
whenever mains voltage is connected (including when the
starter is ready or tripped).
WARNING
Disconnect the soft starter from mains voltage before
carrying out repair work.
It is the responsibility of the user or person installing the
soft starter to provide proper grounding and branch circuit
protection according to local electrical safety codes.
Do not connect power factor correction capacitors to the
output of MCD 500 soft starters. If static power factor
correction is employed, it must be connected to the supply
side of the soft starter.
MCD5-0021B - MCD5-0105B: After transportation,
mechanical shock or rough handling there is possibility
that the bypass contactor may have latched into the on
state. To prevent the possibility of the motor starting
immediately, on first commissioning or operation after
transportation, always ensure that the control supply is
applied before the power, so that the contactor state is
initialised.
WARNING
Safety of Personnel
The soft starter is not a safety device and does not provide
electrical isolation or disconnection from the supply.
•If isolation is required, the soft starter must be
installed with a main contactor
•The start and stop functions of the soft starter
must not be relied upon for personnel safety. A
motor may start or stop unexpectedly if faults
occur in the mains supply, the motor connection,
or the electronics of the soft starter.
To provide machine or personnel safety, the isolation
device must be controlled through an external safety
system.
In Auto On mode, the motor can be stopped using digital
or bus commands while the soft starter is connected to
mains.
CAUTION
These stop functions are not sufficient to avoid unintended
start.
A motor that has been stopped may start if faults occur in
the electronics of the soft starter, or a temporary fault in
the supply mains or the motor connection ceases.
CAUTION
Use the auto-start feature with caution. Read all the notes
related to auto-start before operation.
Safety MCD 500 Operating Instruction
MG17K402 - VLT®is a registered Danfoss trademark 5
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