This is a user manual for MVC4 soft starters, introducing the features, specifications, design features, working principles, general protection, thermal overload protection, trigger circuit, electronic devices and other content of soft starters.
This manual provides detailed instructions for operating and configuring the MVC4 soft starter, an SCR-based controller for medium voltage AC motors. It covers specifications, wiring, menu navigation, setpoint programming, metering, and maintenance. The device supports programmable acceleration and deceleration, overload protection, and communication via Modbus RTU. It is designed for 7.2kV systems and includes features like RTD temperature monitoring and event logging.
The manual includes diagrams, tables, and step-by-step guidance for setup, troubleshooting, and maintenance. It also explains the user interface, including keypad controls and LED indicators, and describes how to configure relay settings, current limits, and trip parameters for optimal motor performance.
| AC Supply Voltage | 1000 – 7200VAC +10 to – 15% (Model dependent) |
|---|---|
| Unit Running Overload Capacity | 125% - Continuous 500% - 60 seconds, 600% - 30 seconds |
| Frequency | 50 or 60Hz, +2Hz hardware selectable |
| SCR Peak Inverse Voltage Ratings | 4500V - 19500V (Model dependent see Table 1) |
| Control Voltage | 120VAC (Customer supplied) |
| BIL Rating | 1000V – 30KV , 2300V - 7200V |
| Communication Protocol | Modbus RTU |
| Operator Interface | LCD Readout, Keypad, 12 LEDs |
It supports AC supply voltage from 1000 to 7200VAC, with a tolerance of +10 to –15% depending on the model.
It uses 6, 12, or 18 SCRs depending on the model.
It supports Modbus RTU protocol via RS-485, RS-422, or RS232.
The auxiliary contacts are rated at 5 amps, 240VAC maximum.