126 Option
T1: First time RSYC-01 SYNC signal is high, which means voltage frequency and phase
angle of main and converter output are matching. RMS of voltage adjusting starts.
T2: Voltage amplitude matching is high, which means voltage amplitude of main and
converter output are matching.
T4: Frequency and phase angle have been martching for more than 5 seconds, and also
Voltage amplitude has been matching for more than 5 seconds. MB closes à Conver
output current ramps down to zero à Drive stops modulation à MSS opens.
During synchronization, when the amplitude, frequency and phase angle of converter
output voltage and grid voltage are within the limit, the converter output current is
measured, and the converter is switched to current control. After MB closed feedback is
received, current amplitude reference will ramp down to zero, and then converter stops
modulation. After that MSS will open, and synchronization to grid is finished.
SBU Current Control and Datalogger
The tool to check behavior of SBU current controller is datalogger of DriveComposer.
During every SBU commissioning, the Service Engineer should trigger a datalogger during
synchronization as per below instructions.
• Instruction on using Dataloggers can be found in Drive
Composer manual
(3AUA0000094606).
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