This document introduces the user manual of MOTORTRONICS TM Solid State AC Motor Control
The VMX2 Series is a digitally programmable solid-state reduced voltage soft starter designed for three-phase AC induction motors. It features a six-SCR design with voltage and current ramp control, anti-oscillation circuits, and programmable auxiliary contacts for smooth load acceleration and reduced inrush current.
| Type of Load | Three-phase AC induction motors |
|---|---|
| AC Supply Voltage | 208 - 600VAC ±10%, 50/60 Hz |
| Power Ratings | 9 - 1250 Amps, 7.5 - 1000 HP @ 460V |
| Overload Rating | 500% - 60 seconds |
| SCR Firing Angle Detection | 6 pulse Independent Locked Phase Tracking |
| SCR PIV Ratings | 1600V |
| Control Power | 120VAC (240VAC optional) |
| Inputs | 6 Dry (voltage free) contact inputs |
| Programmable Relay Outputs | 3 relays, 2 each Form C (SPDT), 1 each Form A (SPST) |
| Output Relay Contact Rating | 5 Amps, 240VAC max |
| Approvals | UL Listed, cUL Listed, CE Approved |
The SCRs are sized to withstand starting currents of 500% for 20 seconds (Standard Duty) and up to 500% for 60 seconds (Heavy Duty).
Yes, the starter must be sized for the total amps used by multiplying the nameplate FLA by the stated Service Factor.
The unit supports Voltage Ramp (VR) or closed loop Current Ramp (CR).
The ramp time can be programmed from 1 to 120 seconds.