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2-4 Installation MN894
Non-Motor and Special Motor Applications
Non-motor load: The multipurpose control is designed to provide reduced starting voltage for standard
three phase induction motors. The control may also start non-motor loads for controlled
inrush current applications with resistive or inductive loads. Consult Baldor if the control
is to be used with a non-motor load.
Wye-Delta or The multipurpose control can replace an existing wye-delta or part winding starter.
Part Winding Starter: Begin by removing the existing contactors. Wire the motor in its “RUN” delta
configuration and connect the motor to the control. The control can be used as if it were
controlling a standard design B motor.
Wound Rotor Motors: Consult Baldor if the control is to be used with a wound rotor or slip ring type motor. This
type of load produces high starting torque with reduced starting current and speed. The
multipurpose control provides low starting current and low starting torque. The
multipurpose control can be used for applications that do not require high starting torque
and a continuous speed reduction.
High Slip Motors: The multipurpose control can be used with high slip motors, such as design D. These
motors are used with large inertial loads that require extended starting times. Reduced
starting voltage will reduce the starting current and extend the starting time. Long starting
times may require using slow trip overloads. However, the thermal capabilities of the
motor and control must be evaluated before extending the overload trip times.
Reversing Applications: For reversing applications, two multipurpose controls can be used or a reversing
contactor can be used. Consult Baldor for more information.
Multispeed Motors: Consult Baldor if the control is to be used with a multispeed motor. The control can
be used with a multispeed motor if a multispeed starter is connected between the control
and the motor. In this case, an additional MOV must be connected to the terminal side of
the control. Switching is normally done be auxiliary contacts from the multispeed starter
that are connected to the control circuit of the multipurpose control.
Motors on Grounded and A multipurpose starter should not be used with “Delta” or “Open” ground systems.
open delta systems: Without a proper ground, the circuit to detect a shorted SCR condition may malfunction or
may not be able to detect a shorted SCR condition.