Motortronics Solid State AC Motor Controls

VMX-C Enclosed Soft Starter

Compact Soft Starter

AC Supply Voltage
200 to 600 Vac

HP Ratings
5 to 1200 HP

(18 to 1250 Amps)

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	Jog Dry contact closure selects a non-ramping Jog function at an adjustable torque
Line Voltage Range 200 to 600 VAC, 3 phase +10% -15% on all units, 50/60Hz	Kick Start 10 - 100% starting torque for 0.1 - 2 seconds
Current Ratings 18 - 1250A depending on unit selection Range of each unit is 50-100% of maximum	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
AC Supply Voltage User supplied 120VAC +10% -15% tolerance, 60Hz Optional 240VAC 50Hz control available	Restart Delay Timer (Sequential Start Delay) Programmable time delay 1 - 999 seconds after loss of control power for staggered restarts
Overload Capacity (% of motor FLA) Standard Duty: 350% for 30 seconds, 1.0 SF Heavy Duty: 500% for 30 seconds, 1.15 SF	Time Clock Controller 24 hour/7 day time clock to provide automatic start Up to 7 start events per day Select operation from 1 through 7 days per week Run time determined by process control timer
Bypass Contactor Standard on all units Standard Duty: Shunt rated bypass Heavy Duty (Across-the-Line) line start rated bypass	Process Control Timer (choice of either) Minimum Run (Batch) Timer 1- 999 minutes Runs until time expires, resets only if expired Resumes and finishes if stopped or power is lost Permissive Run Timer 1- 999 minutes Only allows operation during active run time
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	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
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	Operator Interface Tactile feedback keypad Easy to read LED display Run and fault status indicators
Dual Ramps Select via dry contact closure between any combinations of the above	Electronic Shear Pin Protection Trip level: 100 - 300% of motor FLA with trip delay
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.	Motor Duty Cycle Protection Back-spin/coast-down, starts-per-hour or minimum time between starts lockouts. Restart delay after a power failure.
Real-Time Thermal Modeling Continuously calculates motor operating temperature even when the motor is not running.	Short Circuit Trips at 10x unit current rating during run. Checks for shorted load prior to each start.
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 clock.	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.
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.	Metering Monitors phase current, ground current and motor thermal capacity.
Motor Temperature PTC thermistor input can also be used for E-stop or external overload relay.	Phase Loss Trips on phase current or voltage loss
Equipment Ground Fault Residual current method with adjustable trip delay.	Phase Rotation Phase rotation trip can be set to A-B-C, A-C-B or disabled.
Phase Current Imbalance/Loss Protection Trip level: 5 - 30% current imbalance between any two phases with trip delay