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FOR MANAGERS AND OPERATORS 383
"balancer." The 500 volt D. C. compensate is, however, a true motor generator, the motor having no electrical connection with the generator. The generator end of the D. C. compensarc has exactly the same characteristics, as that of the A. C. to D. C. machine, and will handle the arc without any steadying resistance interposed. The two-lamp outfits use a steadying resistance during the time of changing from one lamp to the other only, during which period both arcs are burning simultaneously. The generator end of both A. C. to D. C. and D. C. to D. C. compensarcs have practically the same mechancial construction.
The D. C. compensarc has a fan, protected by a metal guard for the safety of the operator, mounted on the shaft between the two machines. This fan rotates with the shaft and sets up a current of air which helps keep both motor and generator cool.
Installation. — See General Instruction No. 2.
Oil. — See General Instruction No. 3.
Removing Sub-Base to Install. — See General Instruction No. 2 and, in addition, dowel pins are provided in the base of the generator end. To remove these pins hold the squared head of the pin with a wrench and tighten up the nut, which will pull out the pin. Be very careful that any liners found under the feet of the motoror generator be carefully replaced in their original position. Should the coupling be taken apart it must be very carefully reassembled, making sure that the chisel marks on the rim register with each other.
A. C. to D. C. compensarcs should never be run on circuits where the variation of either frequency or voltage from normal exceeds 5 per cent. Where both frequency and voltage vary the sum of the variation must not exceed 8 per cent.
Size of Fuses. — The lamp side of these machines does not require fusing, since the generators automatically protect themselves against overload current when the arc is short circuited.
The motor side of the various machines should be fused as follows:
D. C. Compensarcs.
50 amp. 1-lamp and
2-35 amp. lamps 2-50 amp. lamps
35 amp. 1-lamp alternately alternately
115 volt — 30 amp. fuses 60 amp. fuses 100 amp. fuses
230 volt — £0 amp. fuses 40 amp. fuses 60 amp. fuses
550 volt — 10 amp. fuses 20 amp. fuses 30 amp. fuses