REF DES
Ra
Rb, RC
M2, M3
FREQUENCY SENSING CHECK (HIGH AND
LOW FREQUENCY)
CONNECT GOVERNOR CONTROL UNIT TO
TEST EQUIPMENT AS SHOWN
TURN Ra SO THE RESISTANCE BETWEEN
P1-M AND P1-T IS 250 OHMS.
REDUCE THE FREQUENCY OF THE AP-
PLIED 120 ± 2 VOLT SUPPLY UNTIL M2
AND M3 BALANCE.
THE FREQUENCY SHALL BE 375-380 Hz.
TURN Ra SO THE RESISTANCE BETWEEN
P1-M AND P1-N IS 250 OHMS.
INCREASE THE FREQUENCY OF THE
APPLIED 120 ± 2 VOLT SUPPLY UNTIL
M2 AND M3 BALANCE.
THE FREQUENCY SHALL BE 420-425 Hz.
TEST EQUIPMENT
QUANTITY
DESCRIPTION
1
POTENTIOMETER, 10 TURN, 500 OHMS, 5 WATT
2
RESISTOR, FIXED, 250 OHMS, 5 WATT
2
MILLIAMMETER, DC, 0-1000 MA
1
DC POWER SOURCE
1
AC POWER SOURCE
ME 6115-545-34/7-8
Figure 7-8.
Electric Governor Control Unit, Frequency Sensing Check (400 Hz)
7-12
