Milton CAT 3516C HD 2500 kW 3125 kVA 60 Hz 1800 rpm 480 Volts Generator Data - Manual (Page 9)

TYPE OF REDUCED MULTIPLY
VOLTAGE STARTING LINE SKVA BY
80% TAP .80
65% TAP .65
50% TAP .50
45% TAP .45
Wye start,delta run .33
AUTOTRANSFORMER
80% TAP .68
65% TAP .46
50% TAP .29
NOTE: REDUCE VOLTAGE STARTING LOWERS THE MAXIMUM
REQUIRED MOTOR skVA.
3. Part winding starting:
Most common is half-winding start, full-winding run.
Multiply the full motor, accross line starting skVA
by 0.6. Apply the result to the selected curve as
in ii. A above. Read the expected voltage dip, for
the required skVA.
III.DEFINITION:
A. GENERATOR TERMS
MODEL: Engine Sales model
ENG TYPE: DI = Direct Injection,
NA = Naturally aspirated, etc
HZ: Running frequency, hertz
RATING TYPE: PP, SB (prime power or standby)
KW: Base rating electrical kilowatts (ekW)
VOLTS: Rating terminal, line to line
GEN ARR: Cat generator arrangement part number
GEN FRAME: Generator frame size designation
CONN: Generator output connection
(star, wye, delta, ect.)
POLES: Number of pole pieces on rotor.
(eg. A 4 pole generator run at 1800)
RPM will produce 60 Hz alternating current. A 6 pole
generator run at 1200 RPM will produce 60 Hz alternating
current.)
B. GENERATOR TEMPERATURE RISE:
The indicated temperature rise indicated the NEMA limits
for standby or prime power applications. These rises are
used for calculating the losses and efficiencies and are
not necessarily indicative of the actual temperature rise
of a given machine.
C. CENTER OF GRAVITY
The specified center of gravity is for the generator only.
For single bearing, and two bearing close coupled generators, the cent
er of gravity is measured from the generator/engine flywheel housing i
nterface and from the centerline of the rotor shaft.
For two bearing, standalone generators, the center of gravity is measu
red from the end of the rotor shaft and from the centerline of the rot
or shaft.
For two bearing, standalone generators, the center of gravity is measu
red from the end of the rotor shaft and from the centerline of the rot
or shaft.
D. GENERATOR DECREMENT CURRENT CURVES
Page 9 of 10 Caterpillar Generator Data
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