VMX-B Series
Basic Configured Soft Starter – NEMA 4/12
Compact packaging with uncompromised features. The VMX Series is the only fully integrated, compact, world-class design offering uncompromised power and control capabilities — ideal for MCCs, pump control panels, and retrofit enclosures.
| AC Supply Voltage | 208 – 575 Vac |
| Soft Starter | VMX2 (ANSI) |
| HP Ratings | 7.5 to 1,000 HP |
| Amp Ratings | 25 to 1,080 Amps |
| Overload Rating | 500% for 60 sec. (1.0 SF) |
| Enclosure | NEMA 4 / 12 |
| Bypass | Full Voltage D.O.L. start with overload |
Command Center
Illuminated E-STOP, Start/Stop pushbutton, motor run light, Local/Off/Remote selector, fault reset.
VMX2 ANSI Core
Proven VMX2 ANSI soft starter with full motor overload protection.
Adjustable 6 SCR Ramp
Voltage/current ramping with full size SCR bypass and D.O.L. switch.
NEMA 4/12 Enclosure
Ready-to-install in harsh indoor/outdoor environments.
VMX-B (uses VMX2)
Technical Specifications
Power Components
6 SCRs in inverse parallel pairs for full phase angle soft start control
1600V PIV rating on all units
RC snubber for dv/dt protection of each SCR pair
Line Voltage Range
200 to 600 VAC, 3 phase +10% / -15% on all units, 50/60 Hz
Current Ratings
18 – 1250A depending on unit selection
Range of each unit is 50–100% of maximum
AC Supply Voltage
User supplied 120VAC +10% / -15% tolerance, 60 Hz
Optional 240VAC 50 Hz control available
Overload Capacity (% of motor FLA)
500% for 60 seconds
Bypass Contactor
Standard on all units
Shunt rated bypass / Line start rated bypass
Start / Stop Control
2-wire Run-Stop using dry contacts
3-wire Start/Stop with built-in seal in contact
N.C. Interlock input (dry contact) for remote devices
Ramp Control (4 built-in)
Voltage Ramp
Voltage Ramp with Current Limit
CLT© Closed Loop Torque Ramp (Current Ramp)
Current Step (current limit only)
Ramp times adjustable 1 – 120 seconds
Current Limit adjustable 200 – 600% of FLA
Start & Run Protection
Two programmable overload trip curves: Class 5 – 30
Manual or automatic reset, remote reset available
Equipment Ground Fault
Residual current method with adjustable trip delay
Phase Imbalance / Loss
5 – 30% current imbalance between any two phases with trip delay
Jog
Dry contact closure selects a non-ramping Jog function at an adjustable torque
Kick Start
10 – 100% starting torque for 0.1 – 2 seconds
Pump-Flex™ Deceleration
Begin Decel 0 – 100% of line voltage
Decel ramp 1 – 60 seconds
End Decel 0 – 1% of Begin setting
Restart Delay Timer
Programmable 1 – 999 seconds after loss of control power for staggered restarts
RS-485 Serial Communications
Up to 247 starters per link
Modbus RTU protocol built-in
Full programming and remote control over the serial link
Operator Interface
Tactile feedback keypad
Easy to read LED display
Run and fault status indicators
Electronic Shear Pin
100 – 300% of motor FLA with trip delay
Motor Duty Cycle Protection
Back-spin/coast-down, starts-per-hour or minimum time between starts lockouts
Restart delay after a power failure
Short Circuit
Trips at 10× unit current rating during run
Checks for shorted load prior to each start
Shorted SCR
Locks out on any single shorted SCR (defeatable) or shunt-trip on multi-SCR shorts / welded bypass
Metering
Monitors phase current, ground current and motor thermal capacity
Phase Rotation
A-B-C, A-C-B or disabled
VMX-B Series
Documentation
- VMX-B Brochure (Basic Configured Starter)1.68 MB
- VMX-B Quick Start Leaflet232 KB
- VMX-B Quick Start Manual Addendum1 MB
- VMX-B Manual Addendum1.01 MB
- VMX User Manual3.5 MB
- VMX Quick Start Flyer180 KB
- VMX Quick Start Leaflet – Spanish256 KB
- VMX Basic Installation and Quick Startup Manual1.5 MB
- VMX-B Manual Addendum for VMX2948 KB
- VMX2 User Manual3.41 MB
- VMX2 Quick Start Leaflet337 KB
- VMX2 Basic Installation and Quick Startup Manual2.26 MB
- VMX Green Brochure – Green Energy Management782 KB
- VMX-H Brochure (Configured Starter)896 KB
VMX-B Series
Software Tools
System Requirements
Windows 10 or higher
Intel Core i3 or equivalent
2 GB RAM minimum
100 MB disk space