VMX2™

Specification

Designation	3-phase SCR Compact Digital Soft Starter, ANSI rated
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
Supply Voltages	208 to 690 Vac, 3 phase, +10% / -15% on all units 50/60Hz
Current	9 – 1250A depending on unit selection Range of each unit is 50–100% of maximum
HP Ratings	3 to 1,500 HP
Control Supply Voltage	User supplied 120Vac +10% / -15%, 60Hz Optional 240Vac 50Hz control available
Overload Capacity	500% of motor FLA for 60 seconds
Bypass Contactor	Standard on all units Shunt rated bypass / line start rated bypass
Enclosure Type	Module only or NEMA 1 / 12
Ramp Control	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 / 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

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
Short Circuit	Trips at 10x 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
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
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
Metering	Monitors phase current, ground current and motor thermal capacity
Comms	RS-485, Modbus RTU protocol built in Up to 247 starters per link
Operator Interface	Tactile feedback keypad Easy to read LED display with run and fault status indicators
Phase Rotation	A-B-C, A-C-B or disabled