Baldor 15H manual Block Title Parameters Description, Level 2 Block Enters Level 2 Menu

	Table 4-1	Parameter Block Definitions Level 1 - Continued
Block Title	Parameters		Description
V/Hz and Boost	CTRL Base FREQ		Represents the point on the V/Hz profile where output voltage becomes constant with
			increasing output frequency. This is the point at which the motor changes from
			constant or variable torque to constant horsepower operation. In some cases the
			Max Output Volts and CTRL Base Freq values can be manipulated to provide a wider
			constant torque or wider constant horsepower speed range than is normally available
			with the motor.
	Torque Boost		Adjusts the amount of motor starting torque. The boost adjustment alters the output
			voltage to the motor from the normal voltage value by increasing or decreasing the
			starting voltage by fixed values as defined by the V/Hz profile. The factory setting is
			suitable for most applications. Increasing the boost may cause the motor to overheat.
			If adjustment is required, increase the boost in small increments until the motor shaft
			just starts to rotate with maximum load applied.
	Dynamic Boost		The Dynamic Boost parameter can be adjusted to provide more or less running torque
			from the motor than is available with the factory setting. The boost adjustment alters
			the output voltage to the motor from the normal voltage value by increasing or
			decreasing the voltage per frequency unit as defined by the V/Hz profile.
	Slip Comp		Compensates for varying load conditions during normal operation. This parameter sets
	Adjustment		the maximum allowable variation in output frequency under varying load conditions
			(changes of output current). As motor current increases toward 100% of Motor Rated
			Amps, output frequency is automatically increased to compensate for slip.
	V/Hz Profile		Sets the Volts/Frequency ratio of the control output (to the motor) for all values of output
			voltage versus output frequency up to the control base frequency. Because motor
			voltage is related to motor current, motor voltage can then be related to motor torque.
			A change in the V/Hz profile can adjust how much torque is available from the motor
			at various speeds.
			3PT profile - allows two linear V/Hz segments by setting the V/Hz 3PT Volts and V/Hz
			3PT Frequency parameters. 33%, 67% and 100% Square Law profiles are preset
			profiles that provide different variations of the squared reduced V/Hz profile.
			These profiles are shown in Figure 4-3.
	V/Hz 3-PT Volts		The output voltage associated with the 3PT Frequency parameter.
	V/Hz 3-PT		The output frequency associated with the 3PT Volts parameter.
	Frequency
	Max Output Volts		The maximum output voltage available to the motor from the control. This is useful if the
			motor rated voltage is less than the input line voltage. In some cases the Max Output
			Volts and the CTRL Base Frequency parameter values can be adjusted to provide a
			wider constant torque or wider constant horsepower speed range than is normally
			available.
LEVEL 2 BLOCK			ENTERS LEVEL 2 MENU

Figure 4-3 Volts/Hertz Profile

Max Output

Output Volts

Torque Boost

Linear V/Hz Curve

Output Frequency	Base
	Freq.

3 Point V/Hz Curve Square Law V/Hz Curve

Max Output				Max Output
Volts				Volts
Output				Output	33% Square Law
	3 PT	3 PT Volts			67% Square Law
					100% Square Law
	Volts
Torque Boost				Torque Boost
		3 PT Freq.	Base		Output Frequency	Base
			Freq.			Freq.

Output Frequency

MN715 Programming & Operation 4-17