Chapter 1 - Introduction
General Description
The VMX Series is a digitally programmable solid state reduced voltage soft starter using a six SCR
design. It features a voltage/current ramp for smooth load acceleration. The SCRs are sized to withstand
starting currents of 350% for 30 seconds and up to 600% for 10 seconds for applications typical to NEMA /
UL Class 10 overload trip curves. The VMX Series features smooth stepless ramp control, which reduces
motor inrush current and excessive wear on the mechanical drive train components. The VMX Series
includes a programmable keypad for setting operating parameters for the ideal starting cycle and protection
features, plus easy to understand diagnostic LEDs. Starting torque, ramp time, current limit, dual ramp, and
Decel control are standard features on the VMX Series. The VMX Series includes solid state electronic
overload protection in addition to numerous other protective features. It requires 120VAC (220VAC
optional) control power and uses dry contact inputs for
Start / Stop control. Programmable auxiliary contacts and provisions for interlocking are also included.
Sizes and ratings
The Motortronics VMX Series starters are current rated controllers.
Max. Amp ratings are for continuous duty and must not be exceeded.
Always check the motor nameplate FLA and Service Factor (if used)
to ensure proper sizing. Each size has an adjustable range of current
from 50% to 100% of the Max Amp rating. Table 1 to the left shows
the Current Ratings available.
Table 1: VMX Series selection
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