NOTE:
It is also possible to change screens manually (arrows Up and Down) after displaying the
Synchroscope screen. In this case there is no automatic return to the Main Measuring screen after
synchronization is finished.
Voltage matching
The gen-set voltage is regulated to match the mains/bus voltage with tolerance given by the setpoint
Voltage Window. The regulation is adjusted by the setpoints Voltage Gain and Voltage Int.
Frequency/angle matching
The gen-set frequency is regulated to match the mains/bus frequency first. The frequency regulation
loop is active (setpoints Freq Gain and Freq Int). Once the frequency is matched, the regulation loop is
switched to match the angle (setpoint Angle Gain). When the angle is matched with tolerance +/-
Phase Window for a time given by the setpoint Dwell Time and the voltage is matched too, then the
GCB is closed.
NOTE:
The GCB close command will be not issued if the Phase Window setpoint is set to 0. Synchronizing
will continue until the Sync Timeout alarm occurs or the GCB is closed externally.
NOTE:
The matching loops will continue to run even if the GCB close command has been already issued until
the controller receives GCB feedback or a GCB fail alarm occurs. After the feedback has been
received, the control loops are switched to load and power factor loops or load and power factor
sharing respectively.
6.7 Parallel to mains operation – SPtM
SPtM only
After the gen-set has been synchronized to the mains, the parallel to mains operation follows. It
consists of the following phases:
6.7.1 Ramping the power up
The first phase of the PTM operation is ramping the gen-set up to the requested power level. The
speed of the ramp is given by the setpoint Load Ramp. The setpoint adjusts the ramp time for a
change from 0% to 100% of nominal power.
6.7.2 Load control
The load is maintained at the constant level given by the setpoint Baseload. Regulation adjustment
setpoints are available in the Sync/load control group.
NOTE:
In every moment when the requested load (e.g. baseload setpoint) changes, the ramp described in the
chapter above will also take place.
6.7.3 Power factor control
The power factor is regulated to a constant value given by the setpoint Base PF. PF regulation loop is
active. Regulation adjustment setpoints are available in the Volt/PF control group.
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