Baldor VS1MD instruction manual 120, H7 Dwell Frequency Range

H7 Dwell Frequency

Range:	0.1-400 [Hz]
Default:	5.00
Access	Configurable
See also:	P35, P36, H8

When run frequency is issued, the motor will accelerate after the Dwell Frequency is applied for the Dwell Time – H8. Dwell frequency can be set within Frequency High and Low Limits (P35 and P36).

Dwell frequency is used to output torque in an intended direction. It is useful in hoisting applications to apply torque before releasing a mechanical brake. Rated slip frequency is calculated by the formula shown below:

fs	= fr −		rpm ⋅ P
			120
Where,	f s = Rated slip frequency
f r = Rated frequency rpm = = Motor nameplate RPM
P = Number of		⎛Motor poles⎞
H8		⎜		⎟
		⎝		⎠

Example:

Rated frequency = 60Hz; Rated RPM = 1740rpm;

Number of motor poles= 4

			fs = 60 − ⎛		1740 ⋅ 4		⎞= 2Hz
					120
	Dwell freq.
	Start freq.
	Frequency					Dwell time
	Run
	command
Dwell Time
Range:		0-10 [sec]
Default:		0.0
Access		Configurable
See also:		H7
		dwell operation. ⎜					⎟
Sets the time for
				⎝			⎠

Parameter Descriptions 7-41