TM 9-6115-668-13
Turn FREQUENCY ADJUST potentiometer (R3) counterclockwise and press UNDER/OVER
VOLTAGE
illuminated pushbutton switch (S4): UNDER/OVER VOLTAGE indicator (H8) goes out.
j. Adjust underfrequency:
On relay K5 (41, figure 5-19), disconnect cable from terminal 1.
Start up Generator Set 150 kW as instructed in paragraph 2.51.
Turn FREQUENCY ADJUST potentiometer (R4) all the way counterclockwise (0). Lock control
knob with lever.
Use SPD IN potentiometer of speed governor assembly N1 (figure 5-28) to set a frequency of
365 Hz on
FREQUENCY meter (P5).
Use FREQUENCY ADJUST potentiometer (R4) to set a frequency of 370 Hz on FREQUENCY
meter (P5).
Lock control knob with lever.
Turn fmin potentiometer clockwise until UNDER/OVER FREQUENCY indicator (H8) lights up.
Shut down Generator Set 150 kW as instructed in paragraph 2.5.2.
On relay K5, connect cable to terminal 1.
Turn FREQUENCY ADJUST potentiometer (R4) five turns clockwise. Lock control knob with
lever.
Press UNDER/OVER FREQUENCY illuminated pushbutton switch (S4): UNDER/OVER FRE-
QUENCY indicator (S4) goes out.
Start up Generator Set 150 kW as instructed in paragraph 2.5.1.
Turn FREQUENCY ADJUST potentiometer (R4) counterclockwise and check that UNDER/
OVER FREQUENCY (H8) indicator lights up and Generator Set 150 kW shuts down.
Turn FREQUENCY ADJUST potentiometer (R4) clockwise and press UNDER/OVER FRE-
QUENCY illuminated pushbutton switch (H8): UNDER/OVER FREQUENCY indicator (H8) goes
out.
k. Adjust setpoint:
Start up Generator Set 150 kW as instructed in paragraph 2.5.1.
Turn FREQUENCY ADJUST potentiometer (R4) all the way clockwise (10). Lock control knob
with lever.
Use SPD IN potentiometer of speed governor assembly N1 (figure 5-28) to set a frequency of
416 Hz on FREQUENCY meter (P5).
Use FREQUENCY ADJUST potentiometer (R3) to set a frequency of 400 Hz on FREQUENCY
meter (P5).
Lock control knob with lever.
Shut down Generator Set 150 kW as instructed in paragraph 2.5.2.
5-133
