Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 46 / 182

2301E Digital Control Manual 26641
36 Woodward
Speed Bias and Synchronizer Summing
There are three functions that can change the speed reference from the set point
that was determined in the above paragraphs:

Synchronizer bias input

Load bias input

Auxiliary bias input
The synchronizer input is used to match the prime movers speed and generator
phase with bus that it is being paralleled to. Analog input #1 at terminals 19, 20,
and 21 is used as the synchronizer input. The sensitivity of the synchronizer can
be adjusted.
The load bias is the signal from the load control function that will bias the speed
reference to increase or decrease the speed or generator load. When the
generator is paralleled to other units, a change in speed reference bias will result
in a change in generator load, in an isolated generator the load bias will give a
change in speed (droop).
The third speed bias can occur when the control is configured for Analog input #2
to come from an auxiliary load control device. This external control will affect the
speed reference as required depending on its load control mode.
Load Reference and Ramp Functions
This section describes the operation of the load reference and ramp functions
and their relation to each other. Droop operating mode has no ramp functions
and is not included here. Isochronous load sharing descriptions apply to two or
more units paralleled on a common isolated bus or by accessory device with the
utility. Baseload descriptions apply to a unit paralleled with the utility or with one
or more units on an isolated bus. Read this section carefully to be sure your
sequencing provides the proper operating modes.
The control provides an unload trip level set point, baseload set point, rated load
set point, loading rate, unloading rate, and fast loading rate. Loading rate
determines the kW per second increase when the load input is closed. Unloading
rate determines the kW per second decrease when the load input is opened
(unload). The 2nd loading rate (usually a fast kW/sec rate) is enabled by the
Enable fast load rate prompt to TRUE in the LOAD SETTING menu, and setting
a system load percent level which will activate the fast load rate. This mode could
be useful in an emergency start situation where the generator set could be
loaded at a fast rate.
When the system load is high, the oncoming generator will load at a fast rate to
assume it share of the load quicker. In the isochronous mode (CB Aux input
closed), closing the load contact ramps the load set point from no-load to the
load sharing setting. Opening the load contact (unload) ramps the load to the
unload trip level setting. At the unload trip level a Circuit Breaker open signal is
issued. Closing the baseload contact ramps the load set point from no-load or the
load sharing setting to the baseload reference. Opening the baseload contact
ramps the load to the load sharing setting.