This manual introduces the features and characteristics of MOTORTRONICS TM Solid State AC Motor Control Compact Soft Starter, including model, specification, installation, connection, fault handling, etc.
The VMX 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 or current ramp control, anti-oscillation circuits, and programmable starting torque and ramp times to reduce motor inrush current and mechanical wear. The unit includes solid-state electronic overload protection and various diagnostic features.
| Supply Voltage | 208 - 600VAC ±10%, 50/60 Hz |
|---|---|
| Power Ratings | 18 - 1250 Amps, 7.5 - 1000 HP @ 460V |
| Starting Current Withstand | 500% for 20 seconds (Standard Duty) |
| Starting Current Withstand (Heavy Duty) | 500% for 60 seconds |
| Control Power | 120VAC (240VAC optional) |
| Ambient Temperature | 0° to 50 °C |
| Output Relay Rating | 5 Amps, 240VAC max |
The starting torque is adjustable from 0 - 100% of line voltage for Voltage Ramp or 0 - 600% of motor FLA for Current Ramp.
It uses a sophisticated Thermal Model in the microprocessor to track starting, stopping, and running conditions for maximum motor protection.
The unit supports Voltage Ramp (VR) or closed loop Current Ramp (CR) programmable ramp types.