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The MCD3000 contains dangerous
voltages when connected to line voltage.
Only a competent electrician should carry
out the electrical installation. Improper installation of
the motor or the MCD3000 may cause equipment
failure, serious injury or death. Follow this manual and
National Electrical Codes (NEC
codes.
Safety regulations
1. The soft starter must be disconnected from the
mains if repair work is to be carried out.
2. The [STOP] on the control panel of the soft starter
does not disconnect the equipment from the
mains and thus is not to be used as a safety
switch.
It is the responsibility of the user or the
person installing the MCD3000 to provide
proper grounding and branch circuit
protection according to the National Electric Code
®
(NEC
) and local codes.
Warning against unintended start
1. The motor can be brought to a stop by means of
digital commands, bus commands or a local stop,
while the soft starter is connected to the mains.
If personal safety considerations make it
necessary to ensure that no unintended start
occurs, these stop functions are not sufficient.
2. A motor that has been stopped may start if faults
occur in the electronics of the soft starter, or if the
soft starter's Auto Reset function has been
activated and a temporary fault in the supply
mains or the motor connection ceases.
Symbols used in this manual
When reading this manual you will come across
different symbols that require special attention. The
symbols used are the following:
Indicates something to be noted by the
reader
Indicates a general warning
Indicates a high voltage warning
MG.15.B2.02 – VLT is a registered Danfoss trademark
®
) and local safety
MCD3000 Series
Avoiding soft starter damage
Please read and follow all instructions in this manual.
Additionally, take special note of the following:
1. Do not connect power factor correction
capacitors to the soft starter output. Static power
factor correction, if used, must be connected on
the mains side of the soft starter.
2. Do not apply voltage to the MCD3000 control
inputs. The inputs are active 24 VDC and must be
controlled with potential free circuits.
3. When installed in non-ventilated enclosures, soft
starters should be used with a bypass contactor
to prevent excessive enclosure temperatures.
4. When bypassing a soft starter take care to ensure
phase connections are correct. i.e. B1-T1, L2-T2,
B3-T3.
5. When using the DC Brake function ensure the DC
Braking contactor is connected across output
terminals T2-T3 only and that it operates only
when the braking function is operating. Incorrect
connection or operation will cause soft starter
damage.
Electrostatic Precaution; Electrostatic
discharge (ESD). Many electronic
components are sensitive to static
elect ricity. Voltages so low that they cannot be felt,
seen or heard, can reduce the life, affect performance,
or completely destroy sensitive electronic
components. When performing service, proper ESD
equipment should be used to prevent possible
damage from occurring.
3
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