Bedienungsanleitung PowerTech PT-12KSI (Seite 17 von 44) (Englisch)

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GENERATOR ASSEMBLY INFORMATION

BRUSH SET

Brush Type generators use a set of carbon or graphite brushes that are set into a spring loaded

brush holder, which house and support the brushes. This brush holder is mounted in such a way as to

allow the brushes to maintain a sliding electrical contact between the stationary and rotating components

of the generator. This connection enables DC current to flow from the Voltage Regulator through the

Brushes and into the Rotor assembly.

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 through out the load range, that is from no load to full load.

ROTOR BEARING

The generator rotor assembly is suspended on a shielded factory lubricated ball bearing. A visual

inspection of the bearing is recommended at typical service intervals. If signs of abnormal wear or

leakage are observed, the bearing should be replaced.

Never use liquids of any kind to clean the generator end and bearing.

ROTOR BALANCE

The rotor assembly is precision balanced to a high degree of static and dynamic balance.

Although the balance will remain dynamically stable at speeds in excess of the design frequencies, the

prime mover should be adequately governed to prevent excessive over speed. High centrifugal forces

created by excessive over speed may damage the rotor windings and field coils.

VOLTAGE CONNECTION

The generator may be connected at the terminal board to deliver 120/240 volts to a 3 wire

grounded neutral system, or 120-volts only to a 2 wire distribution system. If any equipment requires

240-volts, then the 120/240-volt connection must be used. 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 on 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 the generator and trip circuit breakers.

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PowerTech PT-12KSI Seite 17

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