Baldor MN770 manual Table A-1, Description of Operation

The parameters and inputs used for torque feed forward are indicated in the Table A-1. For a Vector control, the OPERATING MODE selected will be BIPOLAR or 15 SPEED. For a Series 20H DC SCR control, BIPOLAR HOIST or 7 SPEED HOIST should be selected.

Table A-1

Analog Command	Input Terminal	Input Range and	Description
Select Parameter	Location	Type
10V W/TORQ FF	J1-4, 5	±10 to +10VDC	This input is bipolar. The polarity of the signal selects
	(J4-4, 5 for Inverter)	Differential	the direction and speed of travel.
	J1-2	±10 to +10VDC	This input is bipolar and controls the Torque Feed
	(J4-2 for inverter)		Forward value. Torque is proportional to current. The
			input voltage is scaled to the PK Current Limit value of
			the control. +10VDC = PK Current Limit parameter
			value for positive torque, +5VDC= 1/2 the PK Current
			Limit parameter value and 0VDC= zero current.
			Negative input voltages represent negative torque.
	J1-1	common	Input reference (J1-2 or J4-2).
	(J4-1 for inverter)
	Note: It may be necessary to connect J1-4 or J1-5 to J1-1 (ground). This will
		provide a single ended input range of 0 to 10VDC or 0 to ±10VDC.
	Description of Operation
	This input signal should be applied to the control prior to the control ENABLE signal and
	the release of the holding brake. The control will then generate the commanded torque
	when the control is enabled and the holding brake is released. This occurs because the
	initial current will be greater than the MAG AMPS value. This will generate torque and
	because it is directly proportional to the measured load, it will prevent roll back. It is not
	necessary to remove this input during normal operation.

A-2 Appendix A MN770