Multiquip MQP20IZ Determining Load Characteristics, Calculate SkW as follows, Full SkVA, 100

GENSET SIZING — DETERMINING LOAD CHARACTERISTICS

Determining Load Characteristics (continued)

5.If reduced voltage motor starting is used, determine SkVA as in Steps 1, 2, 3, or 4 on previous page, and then multiply the value by the appropriate multiplying factor in Table 5. Use the following formula:

Calculate SkW as follows:

1.If SPF (Starting Power Factor) is unknown, refer to Table 4 on page 22 and use the value corresponding to the motor horsepower. If a resistor-type reduced voltage motor starting is used, use the value for SPF in Table 6 below.

2.Multiply SkW by 0.5 for motors with low inertia loads (i.e., centrifugal fans, compressors and pumps) where starting torque requirements are low.

Table 6. Reduced Voltage Starting Methods and Characteristics

	% Full	% Full	% Full	SkVA
Starting Method	Voltage		Voltage	Multiplying	SPF
		Voltage kVA
	Applied		Torque	Factor
Full Voltage	100	100	100	1.0	—
Reduced Voltage	80	64	64	0.64	—
	65	42	42	0.42	—
Autotransformer
	50	25	25	0.25	—
Series Reactor	80	80	64	0.80	—
	65	65	42	0.65	—
	50	50	25	0.50	—
Series Resistor	80	80	64	0.80	0.60
	65	65	42	0.65	0.70
	50	50	25	0.50	0.80
Star Delta	100	33	33	0.33	—
Part Winding (Typical)	100	60	48	0.6	—
Wound Rotor Motor	100	160*	100*	1.6*	—

*— These are percents or factors of running current, which depend on the value of the series resistances added to the rotor windings.

PAGE 24 — INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07)