Baldor MN850, Baldor manual Motor Starting Key Terms, Motor Starting Definitions Term

Motor Starting Definitions

Term	Definition
Starting	Selectable in Basic Menu as either Keypad or Remote starting method.
Voltage Pedestal	Initial voltage applied to motor after the 3 cycle power–up ramp.
	Programmed as parameter 11 or as Start Pedestal in Basic Menu.
Kick Pedestal	For traction or “frozen” loads, this boost pulse of higher voltage helps the load to start
	moving. Kick Start is in the Advanced menu. Kick Pedestal is parameter 13 or as Kick
	Pedestal in Advanced menu.
Kick Time	Number of cycles duration the kick pedestal voltage is applied. Programmed as parameter
	14 or as Kick Time in Advanced menu.
Start Time	Number of seconds after the 3 cycle power–up to full motor voltage. Programmed as
	parameter 12 or as Start Time in Basic Menu.
Dwell Time	Number of seconds that full voltage is applied to the motor before optimizing begins (if
	optimizing is selected). Programmed as parameter 15 or as Dwell Time in Advanced menu.
Optimizing	Process of detecting underload condition and reducing the RMS voltage to the motor. This
	eliminates overflux condition of the motor windings to reduce saturation and results in
	substantial power savings (up to 2% efficiency increase). Optimizing is selected by the
	keypad or as parameter 7 or as Protection parameter in Basic Menu.
Optimizing Rate	A numerical value that represents the rate at which the motor voltage is reduced during
	optimizing. When this number is large, improves efficiency on stable loads. A lower
	number for unstable loads will reduce speed variations. Programmed as parameter P19.
Contactor Delay	A delay is required when an input contactor is energized by the soft–start “Run” relay. This
	delay allows bouncing contactor armature to settle during the “Closed” position.
	Programmed as parameter 71 or as Contactor Delay in Advanced menu.
3 Cycle Power–up	This non adjustable time is to allow voltage build up from zero to the initial pedestal. It is
	intended to reduce current inrush and allows for shorted SCR detection. This delay may be
	turned off to start a motor even with one shorted SCR or to use high inertia loads on class C
	or D motors. Programmed as the “Auto 3MC” parameter in Auto Features menu.

Figure 3-3 Motor Starting Key Terms

Motor
Voltage			Optimise Rate
		Full Voltage
Kick Pedestal
			Optimizing
Auto Pedestal
Voltage Pedestal	Kick
	Time
	3 Cycle
	Power–up		Time
Contactor	Start Time	Dwell Time	Run
Delay

MN850 Operation 3-7