The example below shows regulation that is too slow, and cannot return the operating value to the set point.
Figure 6.3 Example of regulation that is too slow to respond to a load increase
50.0
time
Frequency
[Hz]
49.0
51.0
Change
1
Set point
The example below shows regulation that is too fast. As a result, the frequency is unstable.
Figure 6.4
Example of regulation that is too fast and unstable
50.0
time
Frequency
[Hz]
49.0
51.0
Change
1
Set point
6.2 Relay-controlled regulators
6.2.1 Checking the control range
You may need to set the resolution in the control range on the governor or AVR itself. If the resolution is too low in the
governor/AVR's control range, then the controller's relay outputs will not be able to control the frequency/voltage accurately
enough. However, if the resolution is too high in the control range, then the frequency/voltage control may be too slow.
INFO
Refer to the governor/AVR supplier for information on how to set the resolution in the control range.
PPU 300 Commissioning guidelines 4189341106 UK
www.deif.com Page 47 of 75
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