VMX2 / VMX Compact Soft Starter Series

Compact Soft Starter available as Module Only or in NEMA 1 / 12 Enclosure

Flexibility of Control
Multiple ramp profiles, Pump-Flex Decel and advanced motor protection make the VMX Series soft starter adaptable to a wide variety of AC motor applications... no need for add-on modules or costly auxiliary devices.

Compact packaging has become critical in more and more electrical installations. The VMX Series meets this need without compromising features and ratings. By using a highly engineered packaging design and the latest generation microprocessor, all the control and protection features you need are in the VMX Series. Narrow and shallow dimensions are perfect for integrating the VMX Series into motor control centers (MCCs), pump control panels, and retrofit starter enclosures.

Integral Bypass Contactors are standard on all sizes and provide maximum efficiency of panel space while maintaining the Motortronics reputation for being able to soft start most any load. The VMX Series is the only fully integrated, compact, world-class design offering uncompromised power and control capabilities.

AC Supply Voltage: 200 - 690 Vac

HP Ratings: 3 to 1200 HP

Amp Ratings: 18 to 1250 Amps

Overload: 500% for 60 sec.

Enclosure: Available as Module Only or in NEMA 1/12

Call us for pricing and availability.

    Power Components
    6 SCRs in inverse parallel pairs for full phase angle soft start control
    1600V PIV rating on all units
    RC snubber for dv/dt protection of each SCR pair

    Line Voltage Range
    200 to 600 VAC, 3 phase +10% -15% on all units,

    Current Ratings
    18 - 1250A depending on unit selection
    Range of each unit is 50-100% of maximum

    AC Supply Voltage
    User supplied 120VAC +10% -15% tolerance, 60Hz
    Optional 240VAC 50Hz control available

    Overload Capacity (% of motor FLA)
    500% for 60 seconds

    Bypass Contactor
    Standard on all units
    Shunt rated bypass/ Line start rated bypass

    Start/Stop Control Choices
    2-wire Run-Stop using dry contacts
    3-wire Start/Stop with built-in seal in contact
    N.C. Interlock input (dry contact) for remote devices

    Ramp Control Choices (4 built-in)
    Voltage Ramp
    Voltage Ramp with Current Limit
    CLT© Closed Loop Torque Ramp (Current Ramp)
    Current Step (current limit only)
    Ramp times adjustable 1 - 120 seconds
    Current Limit adjustable 200 - 600% of FLA

    Dual Ramps
    Select via dry contact closure between any
    combinations of the above

    Start & Run Protection
    Two programmable overload trip curves allow for the
    thermal capacity required to start the load while providing
    motor overload protection needed during the run time.
    Start: Programmable for Class 5 - 30
    Run: Programmable for Class 5 - 30, enabled when starter
    detects motor is "At-Speed"
    Reset: Manual or automatic, selectable via programming.
    Remote reset available.

    Real-Time Thermal Modeling
    Continuously calculates motor operating temperature even
    when the motor is not running.

    Retentive Thermal Memory
    Remembers the thermal condition of the motor even in the
    event of a power brown-out or black-out when power is
    restored. Extrapolates motor temperature using a real-time

    Dynamic Reset Capacity
    Overload will not reset until thermal capacity in the motor is
    sufficient for a successful restart. Starter learns and retains this
    information from previous starts.

    Motor Temperature
    PTC thermistor input can also be used for E-stop or external
    overload relay.

    Equipment Ground Fault
    Residual current method with adjustable trip delay.

    Phase Current Imbalance/Loss Protection
    Trip level: 5 - 30% current imbalance between any two
    phases with trip delay

    Dry contact closure selects a non-ramping Jog
    function at an adjustable torque

    Kick Start
    10 - 100% starting torque for 0.1 - 2 seconds

    Pump-Flex™ Deceleration Ramp
    Fully adjustable to match field conditions:
    Begin Decel setting, 0 - 100% of line voltage
    Decel ramp time, 1 - 60 seconds
    End Decel setting (Off ), 0 - 1% of Begin setting

    Restart Delay Timer (Sequential Start Delay)
    Programmable time delay 1 - 999 seconds after loss
    of control power for staggered restarts

    RS-485 Serial Communications
    Up to 247 starters per link
    Modbus RTU protocol built-in
    Full programming over the serial link
    Programmable remote starter control

    Operator Interface
    Tactile feedback keypad
    Easy to read LED display
    Run and fault
    status indicators

    Electronic Shear Pin Protection
    Trip level: 100 - 300% of motor FLA with trip delay

    Motor Duty Cycle Protection
    Back-spin/coast-down, starts-per-hour or minimum
    time between starts lockouts. Restart delay after a power failure.

    Short Circuit
    Trips at 10x unit current rating during run. Checks for
    shorted load prior to each start.

    Shorted SCR
    Locks out on any single shorted SCR (defeatable) or
    can provide shunt trip function if multiple SCRs short
    or bypass contactor is welded closed.

    Monitors phase current, ground current and motor
    thermal capacity.

    Phase Loss
    Trips on phase current or voltage loss

    Phase Rotation
    Phase rotation trip can be set to A-B-C, A-C-B or disabled.