TM5-6625-2694-13&P
Manufacturer . . . . . . . . . . . . . . . . T e c h n i c a l
Services
Laboratory,
Inc.
D i m e n s i o n s . . . .... . . . . . . . .. . . . . . . 2 2 . 5 " W , 2 4 " H , 3 6 " L
W e i g h t . . . . . . . . ...... . . .. . . . . . .. . . . . . . 2 2 5
lbs.
Model No . . . . . . . . . . . . . . . . . . . . .Model 1057
Operating Modes . . . . . . . . . . . . . . . . 120/208 4W
240/416 4W
120/240 3W
(Note 1)
120/2w
(Note 2)
240/2W
(Note 3)
Operating Temperatures . . . . . . . . . .
. . . . . 0 - 50 Degrees Centigrade
NOTES :
(1) 120/240 Neutral
not used - high power.
(2) Phase shorting
link - neutral return.
(3) Phase shorting
link - neutral return.
Section
III.
TECHNICAL
PRINCIPLES
OF
OPERATION
1-9.
The Model 1057 Test Set
utilizes switchable
fixed air-cooled
resistors to present various
loads from O-33 KW to the generator.
The resistor loads are arranged in groups of three, thereby allowing
the Test Set
to present balanced loads to three
phase generators. A
shorting link connects the three
groups
of resistors in parallel for
loading
single phase generators.
A voltage sensing module
monitors
the input, automatically determining whether
the control circuits are
for
configured
HI
or
This
LO input voltage.
module
works in
conjunction with the Voltage Input Selector
(P1) to prevent damage to
the
Test Set
should
improper
voltage be applied to the
input
terminals.