Simultaneous 28.5-V Dc And 115-V Ac Power Delivery - Hobart 140GT17P Operation And Maintenance Manual With Illustrated Parts List

OM-2029
Transformer-Rectifier
Figure 3
B. Simultaneous 28.5-V DC and 115-V AC Power Delivery
If both 28.5-V DC and 115-V AC must be delivered at the same time, the following rules and precau-
tions must be observed.
(1) Place T-R current limiting switch in OFF position. This will eliminate the soft start feature of the T-
R, but will prevent AC voltage from dropping low enough to trip the AC load contactor.
(2) Line-drop compensation on the T-R must be REDUCED or turned DOWN completely to prevent
opening of the AC load contactor by an overvoltage condition. Readjust T-R line-drop compensation
so that AC voltage (as indicated by the generator set voltmeter) does not exceed 118-V AC when the
DC load is 500 Amperes. If higher DC voltage is needed, adjust T-R line-drop compensation as re-
quired.Observe AC voltage while making this adjustment to be certain that it does not go TOO HIGH
with DC load.
(3) During simultaneous, continuous operation, loads on either circuit are limited only by the capaci-
ties of their respective circuits, however, the combined loads should not exceed the rated capacity of
the generator set (140 KVA or 112KW).
July 27/90 Revised 1-3
Page 7