Manual PowerTech PTI-25-30-T4F (page 21 of 24) (English)

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Page 21 of 24

PTI-25-30-T4F Operators Manual

GENERATOR ASSEMBLY INFORMATION

EXCITER TYPE GENERATOR

The exciter pole pieces contain residual magnetism, which sets up lines of force

across the air gap to the exciter armature. When the exciter begins to rotate a voltage

is induced and current flow is initiated in the exciter armature AC windings. This voltage

is fed to the rotating rectifier assembly, rectified and fed to the alternator field, which

sets up lines of force across the air gap to the alternator stator windings and to the

output circuit. A static voltage regulator is connected to the generator output. The

regulator will rectify part of the output voltage to provide a DC voltage to the exciter field

coils. This will increase the density of the lines of force in the exciter, increasing the

voltage induced into the exciter armature windings, and therefore, to the rotating

rectifiers. The rotating rectifier output will be increased which increase the alternator

field strength and generator output will build up its rated voltage. Adjustment of the

generator output to the rated voltage level is accomplished by controlling the current fed

to the exciter field coils. Regulation is automatic with the static type voltage regulator.

An additional voltage adjustment range is provided if desired by turning the Voltage

Adjust Rheostat.

ELECTRONIC VOLTAGE REGULATION

Electronic Voltage Regulator (EVR) also referred to, as an Automatic Voltage

Regulator (AVR) is a very reliable device, which uses solid-state electronics to maintain

voltage accuracy at ±2% of the regulated voltage. The Voltage Regulator is designed to

automatically regulate and maintain the generated AC voltage throughout the load

range that is from no load to full load.

VOLTAGE CONNECTION

The generator may be connected at the terminal board to deliver 120/240 volts to

a 3 wire grounded neutral system.

If all equipment requires 120-volts then the 120-volt connection is preferred, even if

two lines leave the same switch box. The two lines at the inputs to the switch box are

both connected to the un-grounded 120-volt lines from the generator.

The 120-volt connection enables the Electronic Voltage Regulator (EVR) to hold the

voltage very close to the 115 or 120 volts, as initially adjusted, regardless of the power

distribution amount the different distribution lines. The 120-volt connection is

recommended if the entire electrical load requires only 115 or 120 volts. Although the

120/240-volt connection may also be used when all loads requires only 110 volts, it

should be pointed out that this connection, the 240-volts, is regulated and the lightly

loaded phase, or line, will deliver a high line to neutral voltage and the heavily loaded

phase will deliver a low line to neutral voltage. The heavily loaded line may have such a

low voltage that air conditioning will have more difficulty in starting, and long starting

lines may overload generator and trip circuit breakers.

For three phase connections, please contact Power Technology’s Tech support Dept.

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PowerTech PTI-25-30-T4F Manual

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