Section IV. VOLTAGE REGULATOR

TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 Section IV. VOLTAGE REGULATOR 4-17. GENERAL. The voltage regulator assembly consists of the voltage regulator mounted with the electromagnetic interference (EMI) filter pack as a complete unit. The voltage regulator assembly senses generator voltage, compares the voltage with a reference voltage, and supplies field (stator) current to the generator to maintain voltage regulation. The EMI filter pack, associated with the voltage regulator, provides EMI suppression. The voltage regulator assembly is a separate unit mounted in the AC-DC control box assembly. 4-18. INSPECTION. Remove cover to facilitate inspection. Check voltage regulator wire connections on the terminal board. Check grounding straps for looseness. Check all components for loose mounting, poor connections, broken wires, or any other signs of damage. 4-19. TEST. The voltage regulator is tested to determine operational capability, as follows (see figures 4-7 and 4-8). a. Operational Test. (1) Connect voltage regulator as shown in test setup, figure 4-7. (2) Disconnect leads from transformer T1 primary, and connect to the 120 volt input tap. (3) Mark position of potentiometer R4 on voltage regulator. NOTE R1 in test setup substitutes for the motor-operated potentiometer in the AC-DC control box assembly. This adjustment is provided to control the generator voltage. When adjusted to its maximum resistance position (CCW), minimum generator voltage is obtained. Maximum generator voltage is obtained with minimum resistance (cw). (4) Set potentiometer R4 on voltage regulator fully counterclockwise. (5) Adjust potentiometer R1 (in figure 4- 7), for maximum resistance. (6) Slowly adjust R1 toward minimum resistance. Before reaching minimum resistance, light bulb should come on to near full Figure 4-7. Voltage Regulator, Test Setup 4-14