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Section 1
General Information
General Information 1-1MN894
Introduction Three phase multipurpose soft starter control provides reduced voltage, three phase
motor starting. Ramp up and extended ramp down features provide an effective means
to start and stop material handling equipment and pumping equipment to minimize
spillage and water hammer problems. Adjustable current limit allows constant current
starting of high inertia loads such as chippers, centrifuges and compressors. It also
reduces the peak demand of power required from utility companies or generating
equipment.
Tachometer feedback may be used to provide consistent starting and stopping times with
linear acceleration and deceleration. This is especially important under varying load
conditions like: textile, material handling and pumping equipment.
Six SCR (silicon controlled rectifier) devices are connected in three sets of inverse
parallel configuration to provide full wave voltage and current control of the three phase
AC motor. MOV (metal oxide varistors) provide surge voltage protection at the AC input
to the starter.
Several product features make this soft start control easy to use:
S Two selectable starting methods.
S Individual ramp up and ramp down adjustments.
S Flexible yet simple setup with switch selections and potentiometer adjustments.
S Simple onboard current calibration.
S Indicator lights and status contacts providing information about the starting,
running and stopping conditions.
S Bar graph display provides a visual representation of motor current to assist in
set-up and troubleshooting. (0 to 400% FLA).
S Tachometer input.
S Five output relay contacts.
S Built-in protection features to reduce down time.