DXT Advanced Digital Soft Starter

AC Supply Voltage
200 to 600 Vac

HP Ratings

10 to 1125 HP

Amp Ratings
39 to 1250 Amps

Overload Rating
500% for 60 sec (1.15 SF)


The DXT Series is a high-end digitally programmable solid state reduced voltage soft starter. This heavy duty starter provides reduced voltage, stepless soft starting of 3-phase AC induction motors, protecting mechanical components from excessive torque stress and electrical systems from the effects
of high motor inrush currents. The DXT Series includes advanced motor and load protection features just like those found in expensive motor protection relays. These include retentive thermal memory, dynamic reset capacity, true thermal modeling, separate trip curves for start and run protection, overload alarm, etc. But in the case of the DXT Series, these features are built in as standard features, providing a cost effective and reliable motor starting and protection scheme for your critical motor applications.

The DXT Series features an easy to use interface operator for programming and status indication. It includes a large tactile feedback keypad, LED status indicators and a 2 line x 20 character backlit display using plain English text readout. In addition to programming the standard parameters such as
starting torque, ramp time, current limit, dual ramp and decel control, other features like programmable overload trip curves (NEMA/UL Classes 5 - 30), starts-per-hour, time between starts and coast down/back spin lockout protection can also be programmed for your specific application needs.

The power of the DXT Series is in the CPU, a microprocessor based protection and control system for the motor and starter assembly. The CPU uses Phase Angle Firing of the SCRs to apply a reduced voltage to the motor, and then slowly and gently increases torque through control of the voltage and current until the motor accelerates to full speed. This starting method lowers the starting current of the motor, reducing electrical stresses on the power system and motor. It also reduces peak starting torque stresses on both the motor and load mechanical components, promoting longer service life and
less downtime.

Acceleration Adjustments Ramp types

Voltage ramp or current ramp Starting torque 0 - 100% of line voltage or 0 - 600% of FLA Ramp time 1 to 120 seconds Current limit 200 - 600%

Retentive Thermal Memory

Overload circuit retains thermal condition of the motor regardless of control power status. Unit uses real time clock to adjust for off time

Dual Ramp Settings*

Four (4) programmable ramp options

Dynamic Reset Capacity

Overload will not reset until thermal capacity in the motor is sufficient for a successful restart. Starter learns and retains this information from previous starts.

Deceleration Adjustments

Begin decel level 0 - 100% of line voltage

Stop level 0 to 1% less than begin decel

Decel time 1 - 60 seconds

Phase Current Imbalance/Loss Protection

Imbalance trip level 5 - 30% current between any two phases Imbalance trip delay 1 - 20 seconds

Electronic Shear Pin Protection Shear pin trip level 100 - 300% of motor FLA Shear pin trip delay 1 - 20 seconds

Jog Settings*

Voltage jog 5 - 100%

Load Loss Trip Protection Under current trip level 10 - 90% of motor FLA Under current trip delay 1 - 60 seconds Coast Down (Back Spin) Lockout Timer Coast down time 1 - 60 minutes

Kick Start Settings

Kick Voltaqe 10 - 100%

Kick start time 0.1 - 2 seconds

Starts-per-Hour Lockout Timer

Starts-per-hour 1 - 10 successful starts per hour

Time between starts 1 - 60 min. between start attempts


Programmable Output Relays

Protection 4 relays; 1 Form C (DPDT), 3 Form A (SPST NO)

5A 240VAC max. (1200VA),

Individually programmable to 19 functions

Event History

Up to 60 events; data includes event, time, date and current for each phase and ground fault current at time of event


Ground Fault: Residual or Zero Sequence

RTD Inputs: Up to 12 RTD’s of any type with biasing or override protection curve


Start & Run Protection

Two programmable overload trip curves allow for the thermal capacity required to start the load while providing motor overload protection needed during the run time.

Start: Programmable for Class 5 - 30

Run: Programmable for Class 5 - 30, enabled when starter detects motor is "At-Speed"

Reset: Manual or automatic, selectable via programming

The DXT Series recognizes motor cool-down rates are a function of the run time and that sometimes a motor will cool faster if allowed to run.

Metering Functions

Motor Load: Percent of FLA

Current Data: A, B, C Phase Current, Avg Current, Ground Fault

Thermal Data: Remaining thermal register; thermal capacity to start

Start Data: Avg Start time, Avg Start Current, Measured Capacity to start, time since last start

RTD Data (Option): Temperature readings from up to 12 RTDs (6 stator RTDs)

Voltage Metering: V, KW, KVAR, PF, KWH, Demand