Hobart 5359D Operation And Maintenance Manual page 140

OM 2012
if th? engine hecomes unstab!:? Lofore 4GG HZ is
ICClCh2d,
turn GA:?! control
counterclockwise until engine s,pccd stabiii-as and ad'juif FI;EQ
coi::rc!
by
turning c I ockw/i:~: to increase speed or counierc!ockv/i;e to decrea;c spzed
untii 490 Hz is indicated 0;7 the frequency meter.
(e) Turn GAiN control clockwise until the engine becomes just unstobl~z (scre:-;s).
Back the GAfN control sliyfitiy coun:ercIockwbe until the engin: is again
stab le.
(f) Turn the STAG lLfTY control slowly c icckwise until the engine becom-+s
uns tab ie . Back the STABiLiTY
counterclockwise utltif
the engine k crgain stable,
control siighti
Then turn STAB1 I
COUNTERCLOCKWISE.
ITY control two graduations
(g)
The electric governor is now set to a nomincliy good operating point.
.
(h) Tighten all adjustment control lociinuts.
(4) Electric governor test values
(a) Signal to actuator
f
Check amperage value of the signal to actuatcz by disconnecting iecd at
terminal (5, or 0, Fig. 12) at control box terminal board. Connect an
accurate ammeter in the circuit.
Current value when operating at govcrred
speed (2000 RPM, 4OG-Hz) should be 2. I-A to 3.0-A at 4-V to 6-V. At
full load, current value shodid be 0.974 to 1.3-A HIGHER than no-load
value. Voltage should be approximately 4 to 6-V DC at no load.
(b) Magnetic pickup signal
Connect a high impedance voltmeter to magnetic pickup input terminais
(S and T, Fig. 13) on control box terminal board. The voltage vaiuo at
governed speed, no load should be 4-V AC MIN iMUM.
NOTE: A signal as low as 1-V is sufficknt to operate the control unif
satisfactorily,
No voltage indicates the pickup is too fur from
flywhec I teeth, or it is defectivc.
2-3
Aug
25 %fi
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