OLTAGE CONTROL PANEL

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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SR 4 GENERATOR SYSTEMS OPERATION MANUAL VOLTAGE CONTROL ATTACHMENT The location of the manual voltage control panel can be up to 76 ft. (23.2 meters) from the generator. Make reference to the chart. CONTROL PANEL LOCATION WIRE SIZE (AWG) MAXIMUM CABLE LENGTH No. 18 30 ft. (9.1 meters) No. 16 48 ft. (14.6 meters) No. 14 76 ft. (23.2 meters) The manual voltage control can be used to control generator voltage when there is a failure in the generator regulator assembly. It will manually control the rate at which control rectifier CR9 is turned on. For information on CR9 operation make reference to OPERATION OF GENERATOR. NOTE: CR9 and CR10 must be able to operate correctly for the manual voltage control to work. The manual voltage control has a switch (1), voltage control rheostat (2), flash button (3) and a control assembly. VOLTAGE CONTROL PANEL 1. Switch (OFF, AUTO and MAN positions). 2. Voltage control rheostat. 3. Flash button. Switch (1) is used to make the' selection between AUTO, MAN and OFF. In the "AUTO" position the generator regulator assembly controls the generator voltage. In the “OFF" position the generator voltage will go to zero. In the "MAN" position generator voltage is controlled by voltage control rheostat (2). Flash button (3) is used when the generator voltage does not build up. With switch (1) in the "MAN" position push flash button (3) until the generator voltage starts to build up. NOTICE Press the flash button only until the generator voltage starts to build up. If the button is held too long the voltage will increase to above the capacity of the generator. This can cause the line circuit breaker to trip or the regulator fuse to open. When flash button (3) is pushed AC current from the generator is rectified by a diode on the manual voltage control panel. This rectified (DC) current goes directly to the generator exciter field. It does not go through control rectifier CR9. CONTROL ASSEMBLY 4. Trigger module. 5. Terminal strip. (4 and 5 are not serviced separately - lowest serviceable level is Manual Voltage Control Assembly) The control assembly is on the back side of the mounting bracket for regulator module A1. The control assembly has terminal strip (5) and trigger module (4). When switch (1) is in the "MAN" position, the action of electrical circuits in trigger module (4) control the amount of "on" time for control rectifier CR9. 50

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