Input/Output Signals For Synchronous Transfer (L29) - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

Potential Fault Conditions
During synchronous transfer there are three alarm/fault conditions that can occur:
• Up Transfer timeout (alarm):
– Means that the transfer has taken longer than allocated in the "Up transfer timeout" menu
• Down Transfer timeout (alarm):
– Means that the transfer has taken longer than allocated in the "Up transfer timeout" menu
• Phase Sequence (alarm or fault):
– Indicates that the drive input phase sequence or direction is different than the drive
8.17.4

Input/Output Signals for Synchronous Transfer (L29)

Input/Output Signals for Synchronous Transfer
Excluding standard run, stop, and speed reference inputs, synchronous transfer requires 4
dedicated input signals and 6 dedicated output signals to be implemented. These signals can
either be hardwired or implemented as digital control bits over one of the NXG-supported PLC
communication links.
Input Signals to the VFD:
• Up Transfer Request
• Down Transfer Request
• VFD Output Contactor Status
• Motor Line Contactor Status
Output Signals from the VFD:
• VFD Transfer Permissive
• Up Transfer Permit
• Up Transfer Complete
NXGPro+ Control Manual
Operating Manual, A5E50491925A
(ID 2760).
(ID 2770).
output. Improper set-up of synchronous transfer could result in an instantaneous over-
current (IOC) drive fault or an out of saturation (OOS) cell fault. Note that an OOS or IOC
have higher probablity of occurring with the reactorless transfer due to the low
impedence connection.
Note
Further causes for failed transfer
The timeout alarms may indicate that other conditions are causing the transfer to fail. For
example, there are not enough active cells left in the drive to support the line voltage
during down transfer.
In this case, the drive sets the SOP flag InsufficientOutputVolts_I high.
Advanced Operating Functions
8.17 Synchronous Transfer
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