This manual introduces the overview, specifications, design features, working principle, general protection, thermal overload protection, firing circuit, electronics, etc. of the MVC Plus 10-13.8 kV class variable frequency drive product.
This manual covers the setup, operation, and maintenance of the Motortronics MVC Plus 10-13.8 kV Class variable frequency drive. It includes wiring diagrams, control connections, menu navigation, setpoint programming, metering functions, and troubleshooting. The device is an SCR-based controller for medium voltage AC motors, with programmable overload curves, phase imbalance protection, and communication via Modbus RTU. Maintenance sections detail SCR testing and failure analysis.
| AC Supply Voltage | 10000 – 13800 VAC +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 | 27000V - 39000V (Model dependent see Table 1) |
| Control Voltage | 120VAC (Customer supplied) |
| Auxiliary Contacts | Multiple: Form C (Contacts), rated 5 Amps, 240VAC max. 8 Relays (4 programmable): Form C contacts |
| BIL Rating | 110kV |
| Overload Reset | Manual Retentive Thermal Memory |
| Phase Current Imbalance Protection | Imbalance Trip Level: 5 - 30% current between any two phases |
| Over Current Protection | Trip Level: 100 - 300% of motor FLA |
| Load Loss Trip Protection | Under Current Trip Level: 10 -90 % of motor FLA |
| Coast Down Lockout Timer | Coast Down Time Range: 1 - 60 minutes |
| Starts-per-hour Lockout Timer | Range: 1 - 6 successful starts per hour |
| Operator Interface | LCD Readout Alpha numeric LCD display |
| Serial Communications | Modbus RTU Signal RS-485, RS-422 or RS232 |
| Clock and Memory | Real Time Clock Lithium ion battery for clock memory only |
10000 – 13800 VAC +10 to – 15% (Model dependent).
5 - 30% current between any two phases.
Modbus RTU Signal RS-485, RS-422 or RS232.