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Medium Voltage Soft Starters


MVC4 Series

The MVC4 Medium Voltage Series Soft Starter is designed to start AC motors in any fixed speed application. It provides maximum protection with "True Thermal Modeling," while allowing smooth, stepless control of acceleration and deceleration. The MVC4 Series guarantees power control and protection for your most important assets.

 

AC Supply Voltage
2300, 3300, 4160, 6000/7200V, 11-15kV
VAC +10% to -15%, 50/60 Hz line voltages

HP Ratings
Up to 10,000HP @ 7.2kV (800 Amps max)
Up to 20,000HP @ 15kV (800 Amps max))

SCR Overload Ratings
500% - 60 seconds, 600% - 30 seconds

Contact factory for higher rating requirements

 

Type of Load

3-phase medium voltage AC induction or synchronous motors

Auxiliary Contacts

Multiple FormC contacts rated 5A @ 250VACmax. 6 fully programmable relays (including fail-safe operation) 5 dedicated relays (fault, at-speed, etc. )

AC Supply Voltage

2300, 3300, 4160, 6000/7200V, 11-15kV VAC +10% to -15%, 50/60 Hz line voltages

HP Ratings

Up to 10,000HP @ 7.2kV (800 Amps max)

Up to 20,000HP @ 15kV (800 Amps max)

Contact factory for higher rating requirements

SCR Overload Ratings

500% - 60 seconds, 600% - 30 seconds

Programmable Features

Motor FLA, service factor, insulation class

Dual Ramp Adjustments - Two independent settings for:

Initial Torque 0 - 100% of nominal torque, voltage or current

Current Limit 200 - 600% of motor FLA

Acceleration Time 1 - 120 seconds

Three Custom Curves Via plotted torque/time axis points

Pump-FlexTm Decel 1 - 60 seconds with begin & end torque adj

Kick Start 0.1 - 2.0 seconds (10 - 100% voltage)

Tach Feedback (option) Closed loop speed ramp

Power Circuits

Series strings of SCR powermodules (1, 2 or 3matched pairs of SCRs per phase depending on voltage rating)

SCR Peak Inverse Voltage

Line Voltage 2,300V, PIV Rating 6,500V

Line Voltage 3,300V - 4,160V, PIV Rating 13,000V

Line Voltage 6,000V - 7,200V, PIV Rating 19,500V

Line Voltage 11,000V - 15,000V, PIV Rating 39,000V

Motor and Starter Protection

Electronic Overload, Phase Loss

Phase Imbalance, Phase Reversal

Short Circuit Detection, Over / Under Current

Over / Under Voltage, Shorted SCR / Shunt Trip

Starter Over-Temp, Coast Down Lockout

Starts per Hour Lockout, Time between starts

RTD Input (Option), Ground Fault (Option)

BIL Rating

2,300V - 7,200V: 60kV

11,000 - 15,000V: 110kV

Statistical Data

Elapsed run time, last start time, average starting current, stores history of up to 60 events (data includes date & time, phase & ground fault current). Also displays time-to-trip, remaining inhibit time and starts/hour values.

Transient Voltage Protection

dv/dt circuits (1 per SCR pair)

Vacuum Bypass Contactor

Standard on allmodels, line start rated

Metering (Voltage & Current)

Percent of FLA, phase currents, kVAR, kVA, kW, power factor, demand, avg. start current, remaining thermal register, thermal capacity to start,measured capacity to start, time since last start, line frequency, phase order, RTD values (optional)

Ambient Operating Conditions

0 - 50C (82 F to 122 F) (Optional -20 to 50 C with heaters)

5 - 95% relative humidity

0 - 3300 ft (1000m above sea level without derating)

Enclosure

NEMA 12 with 3R optional (not for direct sun applications), top and bottom entrance plates, 11 gauge steel, ASA #61 gray powder coated paint

Digital Control Unit (DCU)

Programmable keypad/operator with 2 lines x 20 character backlit LCD display. Status/Alarm LEDs (indicate: Power, Run, Alarm, Trip, Aux 1 - 8)

Communications

RS485 with Modbus RTU protocol or RS232 with windows interface