Manual 37259C
SPM-D11 - Synchronizing Unit
Page 24/79
© Woodward
Operating Modes
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No Load Control
The generator voltage and generator frequency are adjusted to the configured set point values. The generator cir-
cuit breaker is open.
Synchronization
Synchronization with slip
The generator voltage will be corrected to the amplitude and frequency of the synchronization voltage. The close
command for the power circuit breaker will be issued, taking into account the inherent switching delay. The syn-
chronization is carried out under the following conditions (see also tables in chapter "Function" at page 20):
•
The control is in the automatic mode (LED "Automatic" lights up)
•
The synchronization is switched on
•
The voltages and frequencies are within the specified range
•
The input "Enable CB" is energized (if terminal 6 = OFF)
•
The input "Enable CB" is energized to enable the close command and the input "Release control" is ener-
gized, to enable the control functions (if terminal 6 = Release control)
•
The input "Reply: CB is open" is energized
•
The synchronization time monitoring is not switched on or has not tripped
Synchronization with zero phase control
The voltage controller will correct the generator voltage to the amplitude of the synchronization voltage. The fre-
quency controller operates in two possible stages:
•
Frequency
correction: - As long as the difference of the frequency between generator and busbar/mains does
not fall below the configured value "df start", the generator frequency is corrected to that of the busbar/mains.
•
Phase angle correction: - If the frequency difference between generator and busbar/mains is less than the
value "df start", the frequency controller adjusts the phase angle of the generator to that of the busbar/mains,
in order to drive the phase difference to zero. The control of the phase angle is stopped only when the fre-
quency difference between the generator and the busbar/mains becomes greater then the value "df start" plus
a fixed programmed hysteresis of 0.8 Hz.
The close command for the power circuit breaker is issued under the following conditions:
•
The configured limits for voltage and frequency are met
•
The phase angle between the systems is less then the maximal permissible angle for at least the configured
time
•
The input "Enable CB" is energized (if terminal 6 = OFF)
•
The input "Enable CB" is energized, to enable the close command and the input "Release control" is ener-
gized, to enable the controls (if terminal 6 = Release control)
•
The input "Reply CB is open" is energized
The close command is issued without consideration of the inherent switching delay. In the phase-angle-zero-
control mode, the analog input should be selected for the frequency controller.
