FREQUENCY COMPENSATION

The XR2002F (only) provides the following types of frequency compensation:

a. Volts-per-Hertz (V/Hz). This is a linear relationship between voltage and frequency and is

shown in Figure 1-1. This characteristic is generally used to improve system block load pick-up

performance by restraining the voltage recovery until the frequency has also started to recover.

A front panel UF ADJ control is used in conjunction with a VOLT control to provide adjustment of

the V/Hz characteristic along both the frequency axis (45 to 65 Hz) and the generator axis of

Figure 1-1. This characteristic factory preset at 55 Hz (60 Hz nominal).

b. Voltage Limited Volts-per-Hertz (VLV/Hz). This characteristic provides the advantage of

the Volts-per-Hertz characteristic during load application as well as allowing precise voltage

regulation during minor variations in generator speed. The “60 Hz” and “50 Hz” curves of Figure

1-1 represent the 60 Hz and 50 Hz VLV/Hz characteristic. The front panel UF ADJ control

provides adjustment of the corner frequency of both VLV/Hz characteristics along the frequency

axis of Figure 1-1.