The RX3E Enclosed Combination Soft Starter is a rugged, simple to use soft starter with built-in motor protection, providing greater control in starting and stopping of three phase motors. RX3E Series Enclosed Combination Soft Starters come standard with a circuit breaker, full voltage rated emergency bypass contactor, door mounted Start/Stop push buttons, Local/Off/Remote selector switch and door mounted MX3 keypad.
RX3E Series Enclosed Combination Soft Starters are available in either a NEMA 12 or NEMA 3R enclosure. The full voltage rated bypass contactor doubles as a running duty bypass contactor when in soft starter mode. Benshaw’s MX3 control technology (included with RX3E Series Enclosed Combination Soft Starters) provides advanced motor protection with adjustable overload settings and available RTD monitoring, eliminating the need for a third party motor protection relay. A real time clock with an event recorder (up to 99 events) is also included, along with user adjustable motor ramp profiles that can be tailored to the motor load, allowing for a smooth ramp of the motor, and adjustable voltage control deceleration suitable for pumping applications.
Benshaw’s RX3E Series Enclosed Combination Soft Starters can be programmed using a door mounted LCD keypad or Modbus register mapping.
Motor Protection Features
- ANSI 14 – Speed switch and tachometer trip
- ANSI 19 – Reduced voltage start
- ANSI 27 / 59 – Adjustable over/under voltage protection (Off or 1 to 40%, time 0.1 to 90 seconds in 0.1 second intervals, independent over and under voltage levels)
- ANSI 37 – Undercurrent detection (Off or 5 to 100% and time 0.1 to 90.0 seconds in 0.1 second intervals)
- ANSI 38 – Bearing RTD / Other RTD / Open RTD alarm
- ANSI 46 – Current imbalance detection (Off or 5 to 40%)
- ANSI 47 – Phase rotation (selectable ABC, CBA, Insensitive, or Single Phase)
- ANSI 48 – Adjustable up-to-speed / stall timer (1 to 900 seconds in 1 second intervals)
- ANSI 49 – Status RTD
- ANSI 50 – Instantaneous electronic overcurrent trip
- ANSI 51 – Electronic motor overload (Off, class 1 to 40, separate starting and running curves available)
- ANSI 51 – Overcurrent detection (Off or 50 to 800% and time 0.1 to 90.0 seconds in 0.1 second intervals)
- ANSI 51G – Residual ground fault detection (Off or 5 to 100% of motor FLA) / zero sequence ground fault detection (Off, 0.1 – 25 amps)
- ANSI 66 – Starts/hour and time between starts / restart block (backspin timer)
- ANSI 74 – Alarm relay output available
- ANSI 81 – Over/under frequency
- ANSI 86 – Overload lockout
- Single phase protection
- Shorted SCR detection
- Mechanical jam
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