VMX-B "Basic" Configured Starter

Basic Configured Soft Starter in NEMA 4 / 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: 208 - 575 Vac

HP Ratings: 7.5 to 1000 HP

Amp Ratings: 25 to 1080 Amps

Overload: 500% for 60 sec.

Bypass: Shunt Rated Contactor

Enclosure: NEMA 4/12

Starting Method: Adjustable 6 SCR based voltage/current ramping with Full Size SCR Bypass and switch for Full Voltage D.O.L. start with overload.

Call us for pricing and availability.

Command Center
The Command Center Interface allows for basic Functionality and Diagnostics.

Command Center Functionality

Illuminated E-STOP Pushbutton
Start/Stop Pushbutton and Motor Run Light Assembly
Local/Off/Remote Selector
Fault Light / Reset Pushbutton

    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.

    Motor Protection Features

    Retentive Thermal Memory
    Remembers the thermal condition of the motor even if control power is lost. Thermal Register is adjusted for Off-Time when power is resumed.

    Learned Dynamic Reset
    Overload Trip will not reset unless motor has regained enough thermal capacity based on learned motor starting profiles.

    Phase Loss/Sequence Protection
    Trips on any phase under 20% of Voltage. Sequence selectable A-B-C, C-A-B or Off.

    Over Voltage Trip
    Any phase voltage over trip level Of or 1-10% of set voltage, w/1-20 sec. delay.

    Load Monitor (True Motor Power)
    Under or Over kW trip or alarm Off, or 20-100% motor kW, w/1-20 sec. delay.

    Equipment Ground Fault Protection
    Electronic Residual current protection method, no additional CTs needed Setting: Off, 5-90% of CT w/1-60 sec. delay.

    Starts-per-Hour Lockout
    Programmable maximum starts-per-hour to prevent exceeding motor limits. Setting: Off or 0-10 start / Hr.

    Programmable Service Factor
    Service Factor setting automatically adjusts other settings to compensate. Adjustment Range: 1.0-1.15 SF.

    Over-Current Trip
    Electronic Shear-Pin / Shock Relay Setting: Off or 50-300% FLA w/1-20 sec. dela.y

    Under Voltage Trip on Startup
    Off, or 1-30% of set voltage 1-180 second startup time.

    Power Factor Monitor
    Leading or Lagging PF, trip or alarm Off, or 0.01-1.00, lead or Lag w/1-20 sec. delay.

    Short Circuit / Shorted Load
    Peak Current quick trip (electronic fuse) Trip level: Off or 800-1400% FLA, with .1-.5 sec. delay.

    Minimum Time Between Starts
    Used with or without Start-per-Hour protection to prevent short cycling of motor Setting: Off or 1-60 minutes between starts.

    Dual Overload Curve Settings for RV start
    Start Curve can be set to Class 5-30 Run Curve can be set to Class 5-30 Automatic Full Speed detection and change over.

    Current Imbalance Protection
    Provides monitoring of phase-to-phase current levels and trips if imbalance exceeds setting. Setting: Off or 1-30% FLA w/1-20 sec. delay.

    Under-Current Trip
    Load-Loss /Loss of Prime protection Setting: Of or 10-90% FLA w/1-60 sec. delay.

    Under Voltage Trip at Full Speed
    Off, or 1-30% of set voltage 1-20 second trip delay.

    Coast-Down Timer
    Back Spin or Anti-Wind Milling protection Prevents Restart after Stop Command Time Setting: Off or 1-60 min.

    Restart Delay Timer
    Programmable delay for restarting after a power failure for use in multiple installations. Setting: 0-999 sec.