Danfoss VLT MCD 600 Operating Manual page 14

VLT® Soft Starter MCD 600
Operating Guide
UNINTENDED START
When the soft starter is connected to AC mains, DC supply, or load sharing, the motor can start at any time. Unintended start
during programming, service, or repair work can result in death, serious injury or property damage. The motor can start with an
external switch, a fieldbus command, an input reference signal from the LCP, or after a cleared fault condition.
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Press [Off/Reset] on the LCP before programming parameters.
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Disconnect the soft starter from the mains.
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Completely wire and assemble the soft starter, motor, and any driven equipment before connecting the soft starter to AC
mains, DC supply, or load sharing.
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Fit the power supply to the soft starter with an isolating switch and a circuit-breaking device (for example a power contactor)
controllable through an external safety system (for example an emergency stop or a fault detector).
POWER FACTOR CORRECTION
Connecting power factor correction capacitors to the output side will damage the soft starter.
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Do not connect power factor correction capacitors to the output of the soft starter. If static power factor correction is em-
ployed, it must be connected to the supply side of the soft starter.
SHORT CIRCUIT
The VLT® Soft Starter MCD 600 is not circuit proof.
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After severe overload or short circuit, the operation of the MCD 600 should be fully tested by an authorized service agent.
MECHANICAL DAMAGE FROM UNEXPECTED RESTART
The motor could restart after the causes of a shutdown are rectified, which may be dangerous for certain machines or installa-
tions.
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Ensure that appropriate arrangements are made against restarting after unscheduled stops of the motor.
SAFETY OF PERSONNEL
The soft starter is not a safety device and does not provide electrical isolation or disconnection from the supply.
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If isolation is required, the soft starter must be installed with a main contactor.
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Do not rely on the start and stop functions for safety of personnel. Faults occurring in the mains supply, the motor connec-
tion, or the electronics of the soft starter can cause motor starts or stops.
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If faults occur in the electronics of the soft starter, a stopped motor may start. A temporary fault in the mains supply or loss of
motor connection can also cause a stopped motor to start.
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To provide safety of personnel and equipment, control the isolation device through an external safety system.
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Before changing any parameter settings, save the current parameter set to a file using MCD PC Software or the Save User Set
function.
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