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Engineered Low Voltage Starter Products

Wound Rotor Starters

Key Advantages:

• Benshaw MX

technology

• Single step rotor control

• Modular power stack design

for ease of maintenance

• Integral bypass contactor design

• Advanced MX

motor

protection

• Advanced MX

metering

function

• Real time clock

• 99 event log history

• Modbus capable

• Conﬁgurable output relays

• Multistep & variable speed

rotor control available

• Reduced maintenance

• Reduced in size and number

of resistors needed

• Stepless control

• Reduces inrush while

maintaining torque

RATINGS

Horsepower:

20–1500 HP

Overload:

500% for 30 seconds

125% continuous

StartingTorque:

0–100%

Voltage:

200–1000 Vac

Typical Resistance Steps:

1-2

Highlights:

Wound rotor motors are typically used in applications requiring high

starting torques, a limited number of operating speeds, or a stepped

acceleration to achieve a soft start. Typical existing applications utilize

an electromechanical starter on the stator and introduce multiple stag-

es of resistance in the rotor via contactor arrangements to achieve a

soft ramp.

With the RediStart MX

, wound rotor control is greatly simpliﬁed.

The RediStart consists of two major sections: 1) A solid-state stator

control, and 2) secondary resistors into the rotor circuit from

a separate 3-phase resistor bank. This achieves the high torque re-

quired by the application—with low inrush—while providing a smooth

stepless start. This greatly reduces the maintenance cost of the typi-

cal electromechanical control.

Single Step Rotor Control: The solid-state starter is wired to the mo-

tor stator circuit, and the resistor and shorting contactor are wired to

the motor rotor circuit. The solid state starter accelerates the motor to

slip speed (determined by the resistance value) and then activates the

contactor to short the rotor. This allows the motor to accelerate to full

speed.

Multiple Step Rotor Circuit: WR RVSS series starters can be sup-

plied with multiple stages of rotor resistor and contactor combina-

tions. This arrangement may be necessary for multiple step starting

of extremely high inertia loads, or for continuous operation at multiple

speeds. Multiple steps of rotor resistance can be coordinated

to achieve this.

Variable Speed Control: Variable speed control of wound rotor

motors can be accomplished with the RediStart series control. By

maintaining full output voltage of the control going to the stator of the

wound rotor motor, and varying the resistance in the rotor, variable

speed is accomplished.

Resistors must be rated for continuous duty operations. Variable

loads (pumps and fans) only.

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BENSHAW ENHANCED KEYPAD Manuale Utente Pagina 123

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