TO 35C2-3-442-2
counter clockwise to stop hunting. If
readjust R16 and R18 potentiometers to
actuator is still hunting after R18 was
stop movement.
adjusted, rotate R16 to stop hunting.
(h) Vary potentiometer R16
NOTE
either clockwise or counterclockwise to
obtain best stability.
If moving R16
It may require that R18 be
hs no effect. then set R16 at its mid-
readjusted to a new position
rotation position.
and R16 rotated again to stop
hunting.
2.
Parallel Operation Alignment
and Adjustment.
(d) With engine running
and the system stabilized. insert test
(a) Load unit with a load
bank set to obtain a load of 50 KW at
probes of a 0-10 volt dc voltmeter in
test jacks 3 and 4 (test jack 4 is
unity power factor.
positive) . Rotate frequency adjust
rheostat R1 for a 400 Hz reading on the
(b) Connect test probes of
frequency meter. Then adjust potenti-
a 0-10 volt dc voltmeter across pins A
ometer R14 for a zero voltage reading
and B (pin A is positive) of any paral-
leling receptacle (J45. J46 or J47).
between test jacks 3 and 4 under no
load condition.
Adjust the real load sharing potentiom-
eter R28 on the precise relay box to
obtain a reading of 1.5 volts dc.
(e) Insert test probes of
a 0-10 volt dc voltmeter in test jacks
A and B (test jack A is positive).
(c) Place parallel/single
Adjust potentiometer R12 for a voltage
unit switch (S6) in the parallel posi-
reading of 5.0 volts dc between test
tion.
Ensure shorting plug is removed
jacks A and B.
then connect test probes of a 0-10
voltmeter across pins C and D of any
paralleling receptacle (J45, J46 or
(f) Insert test probes of
a 0-10 volts dc voltmeter in test jacks
J47) . Adjust reactive current sharing
A and B (test jack A is positive).
potentiometer R29 on the precise relay
Adjust potentiometer R12 for a voltage
box to obtain a reading of 5.5 volts ac
reading of 4.0 to 6.0 volts dc. Adjust
(7.5 volts ac with 50 KVA at 0.8 power
to highest voltage within range that
factor) .
does not allow actuator to hunt.
(d) When all alignment
procedures have been complied with.
(g) Note governor actuator
piston for no movement.
If necessary
ensure all locknuts on potentiometers
are tightened.
LOAD MEASUREMENT UNIT
Section XII.
set regardless of power factor or phase
6-212. GENERAL.
and provides a dc voltage output pro-
portional to this load. On precise
The load measurement unit is
generator sets this output signal is
utilized on both precise and utility
applied to the load-sensing circuits in
generator sets. The unit consists of a
the control unit to provide a load rate
three phase transformer, rectifiers,
signal to the feedback circuit, and a voltage
It mea-
and a variable load resistor.
sures the total load on the generator
Change 12
6-182A/(6-182B blank)
