Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A
Page 6 of 27
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 below shows the Current Ratings available.
Units without Bypass
For NEMA 1 ventilated applications, or for OEM purposes where a bypass
contactor will be added by others,
VMX-210 models and above
can be selected
without the integral Bypass by substituting the -BP suffix with a -P suffix.
See the Product Selection Guide for ordering details.
Examples:
•
VMX-210-BP = open unit with integral bypass contactor for NEMA 12 / 4
end-user installations
•
VMX-210-P = open unit with cooling fans and without bypass contactor,
for use in NEMA 1 vented enclosures or OEM packages where a bypass
contactor is installed by others
Model
Number
Current
Range
Min.- Max.
VMX-18-BP
9 - 18
VMX-28-BP
14 - 28
VMX-39-BP
19 - 39
VMX-48-BP
24 - 48
VMX-62-BP
36 - 62
VMX-78-BP
39 - 78
VMX-92-BP
46 - 92
VMX-112-BP
56 - 112
VMX-150-BP
75 - 150
VMX-160-BP
80 - 160
VMX-210-BP or -P
105 - 210
VMX-276-BP or -P
138 - 276
VMX-360-BP or -P
180 - 360
VMX-450-BP or -P
225 - 450
VMX-550-BP or -P
275 - 550
VMX-718-BP or -P
359 - 718
VMX-900-BP or -P
450 - 900
VMX-1000-BP or -P
500 - 1000
Table 1: VMX Series selection
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