|
(Continued from
page 241)
Vacuum-Booster Adjustment: After satisfactory performance under various loads is attained
by governor adjustments without the booster, connect the booster. Connect the booster
external spring to the bracket on the governor linkage. With the plant operating at no
load, slide the bracket on the governor linkage to a position where the external spring is
just free from tension.
Apply a full rated electrical load to the generator. The output voltage should stabilize
at nearby the same reading at full load as for no-load operation. The speed may remain
about the same, or increase when the load is applied, resulting in 1- or 2 cycle
frequencies higher than the no-load frequency. (1 cycle is equal to 30 rpm for a 4-pole
generator.) If the rise in frequency is more than 2 cycles, lessen the internal spring
tension. If there is a drop in frequency, increase the booster internal spring tension. To
increase tension, pull out on the internal spring bracket and move the pin to a different
hole.
With the booster disconnected, a maximum drop of 5 cycles from no-load to full-load is
normal. With the booster in operation, a maximum increase of 2 cycles from no-load to 2/3
load is normal. A drop of 1 cycle at 1/4 load is permissible, giving an over-all maximum
spread of 3 cycles.
AMBIENT
TEMP. (F) 60 65 70
75 80 85 90
95 100
------------------------------------------------------------------
CHOKE 1/8 9/64 5/32 11/64 3/16
13/64 7/32 15/64 1/4
OPENING
(Inch)
|
|
