Manual 26059 EGCP-1 Engine Generator Control Package
Woodward 65
When operating in the TEST mode, manual voltage adjustment is only allowed
through the voltage raise and lower inputs. This allows testing of the Voltage
Bias output, and generator voltage levels prior to operation with load on the
generator.
When operating in Isoch mode, the EGCP-1 does not allow manual adjustment
of the voltage, unless the Load Control setpoint in the Configuration tuning
menu is set for “Droop”, or the VAR/PF Control Setpoint in the Reactive Load
Control tuning menu is set to “Disabled”. Using either of these settings implies
that a manual voltage control will be used, and no automatic reactive load
control functions are active.
NOTE: It is highly recommended that the automatic reactive load control in the
EGCP-1 be used for proper power conditioning throughout the generator(s) load
range. This is achieved by setting the Load Control setpoint in the Configuration
tuning menu to Normal, or Soft Transfer (depending on the application), and the
VAR/PF Control setpoint in the Reactive Load Control tuning menu to VAR or
PF control (depending on the application). For more details on these functions
see the Real Load Control and Reactive Load Control sections of this manual.
The percent level of the voltage bias output can be monitored in the I/O Display
status screen of the EGCP-1. This is a useful point to monitor during initial start
of the unit. By issuing Voltage Raise and Lower inputs to the control while
operating in the Test Mode, confirmation of proper generator voltage levels at
various voltage bias points can easily be made. Typically the generator voltage
should change no more than ±10% for a ±100% voltage bias output from the
EGCP-1.
All other modes of generator set operation rely upon the Reactive Load Control
functions of the EGCP-1. See the information in the “Reactive Load Control”
section of the manual for more details on voltage and reactive load control.
Generator Load Control
Power Sensor Theory of Operation
The digital signal processing (DSP) power measurement technique used by the
EGCP-1 control involves periodic sampling of the voltage and current over an
integral number of wave forms. The microprocessor computes the product of the
voltage and current samples, then sums and averages the products to give a
computation of power.
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