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175. Operation of PG-1 Equipments. -The operation of the PG-1 equipment may seem very complicated at first glance, but it will be found that this is not the case. Before starting the equipment check all oiling points on the motor-generator set. See section 36. Make sure that the commutators are bright and clean, and see that all covers are on the rear of the amplifier racks.

Only one amplifier rack is used at a time. Before starting the motor-generator set, see that the switch below the storage battery ammeter is in the "OFF" position. After the motor-generator set has come up to speed this switch should be snapped to the "ON" position. To start the motor-generator set associated with the amplifier to be used, press the "START" button on the metering panel of that amplifier rack. The pilot lamp to the right of the "START-STOP" switch should light when the motor-generator set is running. See that the two lever switches on the amplifier rack being used are closed (in the "up" position) and the corresponding switches on the other rack are open (in the "down" position). See that the loudspeaker change-over switch on the loudspeaker switching panel is the position which connects the speakers to the amplifier rack being used. When shutting down the amplifier rack, snap the switch located below the storage battery ammeter to the "OFF" position before pressing the "STOP" push-button to stop the M-G set.

176. Checking the Voltages on the PG-1 Equipment. -All voltage and current controls, when once adjusted, should be left in these positions except when a check of the equipment with the meters provided indicates that re-adjustment is necessary. All voltages should be checked before the equipment is put into operation. The voltage of the 250 volt generator should be checked first. See Section 171. The following tables give the necessary information for checking the various currents and voltages.

TEST OF GENERATOR VOLTAGES
(Made from Metering Jacks on Metering Panel. See sections 170, 171, 174.)
NOTE: The charging of the storage battery governs the voltage of the 15 volt generator. See section 51.
Jack
Designation
Reading
Multiplying
Factor
Scale
Reading
Actual
Voltage
ECX50
Voltage of 250
volt generator
50
5
250 Volts
EAX2
Voltage of 15
volt generator
2
6.5
See note above
13 Volts
EB123X100
Plate voltage of
tubes 1, 2, and 3
100
5
500 Volts
EB413X100
Plate voltage of
tubes 4 - 13
(Votage of 1000
volt generator
100
10
1000 Volts
7


Chapter Thirteen Pages
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[25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35]

Chapter
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