T . O . 35C2-3-442-2
4. Rapidly decrease engine speed by
turning the manual speed control knob to its
ERNOR STABILITY AND TRANSIENT
lowest possible speed obtainable. Increase
RESPONSE TEST .
engine speed by turning the manual speed
control knob to its maximum speed obtain-
able, The manual speed control shall be
a d j u s t a b l e from idle (approximately
governor stability and transient response
1400 RPM) to 2250 25 RPM.
test as follows:
10-15. REGULATOR RANGE TEST.
at full load until temperatures have
Perform the regulator range test as
b. Drop and apply the load a sufficient
number of times to make sure that the volt-
at full load. Adjust voltage for 480 volts
(for 50/60 hertz operation) and 458 volts (for
c . The governor shall be set at isochron-
400 hertz operation). Record voltage and
speed. Adjust voltage for 395 volts (for
and at 2.9 to 3 percent for uti Iity generator
50/60 or 400 hertz operation. Record volt-
sets. Adjust voltage to rated value. No
age and speed.
further adjustments shall be made during
this test. The recorders in the test circuit
are now started.
b. Reduce load to zero. Adjust voltage
for maximum attainable voltage. Record
d. Perform the following load switching
voltage and speed. Adjust voltage for mini -
sequence starting with full load, waiting
mum voltage attainable. Record voltage and
approximately 30 seconds between each load
c. The generator set shall operate at
Adjust load to full load and starting from
any load between no load and full load at the
no load: full load - 0 - full load - 0 -
following line-to-line voltages:
full load -0
Adjust load to 3/4 load and starting from
1. Between 380 and 426 volts for
no load: 3/4 -0-3/4-0-3/4-0
50 hertz operation.
Adjust load to 1/2 load and starting from
2. Between 375 and 489 volts for
no load: 1/2 -0-1/2-0-1/2-0
60 hertz operation.
Adjust load to 1/4 load and starting from
3. Between 395 and 458 volts for
no load: 1/4 - 0 - 1 / 4 - 0 - 1 / 4 - 0
400 hertz operation.