This document is the user manual for VMX Digital Solid State Soft Starter, which describes the installation, motor overload protection, connections, programming, startup, fault conditions, and other aspects of the product.
The Motortronics VMX Series is a digitally programmable solid-state reduced voltage soft starter designed for three-phase AC induction motors. It features six SCRs with a hard fire picket firing circuit to provide smooth, stepless ramp control and reduce motor inrush current. The unit includes integrated electronic overload protection, a real-time clock controller, and programmable auxiliary contacts.
| Type of Load | Three phase AC induction motors. |
|---|---|
| AC Supply Voltage | Universal, 208 - 600VAC +10%, 50/60 Hz. |
| Power Ratings | 18 - 1250 Amps, 7.5 - 1000 HP @ 460V. |
| Unit Capacity - Overload Rating | 350% for 30 seconds; 600% for 10 seconds. |
| Control Power | 120VAC (customer supplied), 240VAC optional. |
| Inputs | 6 Dry (voltage free) contact inputs using 24VDC from an internal power supply. |
| Programmable Outputs | 3 relays, 2 each Form C (SPDT), 1 each Form A(SPST). |
The SCRs are sized to withstand starting currents of up to 600% for 10 seconds.
It is designed specifically for three-phase AC induction motors.