This is a medium voltage solid state soft starter, including 1.0-7.2kV models, suitable for AC motor control
This document provides detailed instructions for installing, configuring, and operating the Motortronics MVC4 medium voltage soft starter. It covers wiring diagrams, control connections, setpoint programming, metering functions, and troubleshooting procedures. The unit is designed for AC motors and includes programmable overload protection, phase imbalance detection, and communication via Modbus RTU. It supports voltage and current ramping, fault diagnostics, and real-time monitoring.
The manual includes sections on user interface navigation, relay and I/O configuration, RTD options, and metering data. It also details maintenance procedures and failure analysis, including SCR testing. Specifications cover voltage ranges from 1000V to 7200VAC, SCR configurations, and environmental ratings.
| AC Supply Voltage | 1000 – 7200VAC +10 to – 15% (Model dependent) |
|---|---|
| Unit Running Overload Capacity | 125% - Continuous 500% - 60 seconds, 600% - 30 seconds. 1 Cycle: Up to 14x FLA |
| Frequency | 50 or 60Hz, +2Hz hardware selectable |
| Power Circuit | 6 SCRs, 12 SCRs, 18 SCRs (Model dependent) |
| SCR Peak Inverse Voltage Ratings | 4500V - 19500V (Model dependent see Table 1) |
| Ambient Condition Design | 0° to 40°C (32° to 104°F) (optional - 20° to 50° C with heaters) |
| Control Voltage | 120VAC (Customer supplied) |
| Auxiliary Contacts | Multiple: Form C (Contacts), rated 5 Amps, 240VAC max. 8 Relays (4 programmable) |
| BIL Rating | 1000V – 30KV , 2300V - 7200V 60KV |
| Communication Protocol | Modbus RTU |
| Operator Interface | LCD Readout Alpha numeric LCD display Keypad 8 function keys with tactile feedback |
| Clock and Memory | Real Time Clock Lithium ion battery for clock memory only |
The AC supply voltage range is 1000 – 7200VAC with a tolerance of +10 to – 15% (model dependent).
The power circuit includes 6, 12, or 18 SCRs depending on the model.
The unit can handle 125% continuous overload, up to 500% for 60 seconds and 600% for 30 seconds, with a 1-cycle capacity of up to 14x FLA.
It has phase current imbalance protection with a trip level of 5–30% and a delay of 1–20 seconds.