Siemens SINAMICS PERFECT HARMONY GH180 - Page 288

13.When cell diagnostics is complete, the In-Sync signal is checked to determine if M1 can be
commanded to close. There is no drop in input voltage, and the cell capacitors maintain their
charge. The wait for the In-Sync signal is inde󹪝nite as long as:
– MV is maintained through the M4 contactor
– a pre-charge fault does not occur
– the pre-charge command is not removed.
Note
Pre-charge in Service Mode
If Service mode is selected, pre-charge completes at this point with M4 closed and MV
stays on through the pre-charge source.
Note
Software Sync Check
• If software sync check is disabled, the In-Sync signal is received from Digital Input 1 on
the User I/O board.
• If software sync check is enabled, the drive will use the three additional input voltages
present on the System Interface Board to determine if the voltage upstream of the
main contactor/breaker is matched in frequency, voltage, and phase.
• Software sync checking may be enabled to replace the external In-Sync signal.
• Sync checking can be enabled/disabled with parameter 2631, Sync Check Enable. The
software will measure the frequency, phase, and magnitude of pre-charge input and
output voltages.
• If the frequencies are equal, if there are valid voltages, and if the phase di󹪜erence
magnitude is within the user selectable Sync Check Angle, (parameter 2631), then the
M1 contactor may close.
14.After receiving the In-Sync signal, M1 is commanded to close through two separate digital
outputs on the breakout board: M1 close permissive (DO-14), and Precharge Complete-M1
Close (DO-9).
– The drive waits 3 seconds for the M1 contactor to close, via the digital input for the M1
Acknowledge (DI-2E).
– If the M1 acknowledge does not return within 5 seconds, a pre-charge M1 contactor fault,
"PreChrg M1 Contactor Flt", occurs and pre-charge is aborted.
Advanced Operating Functions
8.17 Synchronous Transfer
NXGPro+ Control Manual
286 Operating Manual, A5E50491925A