VMX
2
Series Digital Solid State Soft Starter User Manual
1 |
P a g e
Chapter 1 - Introduction
1.1 General Description
The
VMX2 Series
is a digitally programmable solid-state reduced
voltage soft starter. Its six SCR design features a voltage/current ramp
with an anti-oscillation circuit for smooth load acceleration. The SCRs
are sized to withstand starting currents of 500% for 20 seconds
(Standard Duty) and up to 500% for 60 seconds (Heavy Duty). The
VMX2 Series
features smooth, stepless ramp control, which reduces
motor inrush current and excessive wear on the mechanical drive train
components. The
VMX2 Series
includes a programming 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
VMX2 Series
. By simply adjusting the units
’ starting
torque, ramp time, and current limit functions, the starting electrical
characteristics of the motor can be matched to the mechanical
characteristics of the drive train for controlled acceleration of the load.
The
VMX2 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.
1.1.1 Control Features
Acceleration Adjustments
Programmable Ramp Types:
Voltage Ramp (VR) or closed loop Current Ramp (CR)
Initial Values: 0 - 100% of line voltage (VR)
or 0 - 600% of motor FLA (CR)
Ramp Time: 1 to 120 seconds
Current Limit: 200 - 600% (VR or CR)
Dual Ramp Settings
4 Options:
Ramps 1 & 2 = VR.
Ramp 1 = VR, Ramp 2 = CR.
Ramps 1 & 2 = CR.
Ramp 1 = CR, Ramp 2 = VR.
Dual Ramp Control:
Ramp #1 = Default.
Ramp #2 = Selectable via dry contact input.
Deceleration Adjustments
Begin Decel Level: 0 - 100% of line voltage
Stop Level: 0 to 1% less than Begin Decel Level
Decel Time: 1 - 60 seconds
Programmable to Decel or coast to stop upon overload trip.
Jog Settings
Jog function selected via dry contact closure input.
Jog Voltage: 5 - 100%
Time of Jog Voltage: 1 - 20 seconds
Jog Current: 100 - 500%
Kick Start Settings
Kick Voltage: 10 - 100%
Kick Time: 0.1 - 2 seconds
