Synchronous Transfer Without Output Reactor - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

Advanced Operating Functions
8.17 Synchronous Transfer
• Down Transfer Permissive
• Down Transfer Complete
• Open Motor Line Contactor
8.17.5

Synchronous Transfer without Output Reactor

Not having an output reactor provides reduction in footprint. It also changes the down transfer
to a break-before-make state machine. This is due to the sensing of the line contactor state. All
handshaking signals remain the same and function the same as when an output reactor is
specified. The only difference here is the line contactor status feedback
flag "LineContactorAcknowledge_O" is not used.
To speed up the sync transfer state machines, the wait for the contactor acknowledge is replaced
with internal algorithms to determine the line contactor status at the appropriate point in the
state machine. This method is determined by the setting of the parameter "Sync Transfer Type"
(2775) to select whether or not an output reactor is used.
Up Transfer with No Reactor
On up transfer, when the line contactor closes, the opposing sources and slight mismatch results
in current ripple. The magnitude of this ripple will determine the closure of the line contactor,
which is sensed from the fast loop. Once affirmed, the drive output is immediately disabled, and
the state machine is set to the completed state. The waiting for the transition to the transfer
completed state to remove the drive enable is eliminated. This minimizes the amount of time
that both sources are supplying the motor. There are no other changes in the up transfer state
machine.
The magnitudes of both the Id and Iq current feedback must be compared to the menu threshold
level – "Up Transfer Threshold" (ID 2762) – individually. This is used in place of the hardware
acknowledge feedback when the parameter – "Sync Transfer Type" (ID – 2775) set to "No
Reactor".
D to E
(line contactor ack )
With output reactor
(line contactor detec on)
Drive disabled immediately
Figure 8-8
260
Transfer Init
E to A
(run request removed)
Drive enable removed
E E
Transfer Transfer
Complete Complete
D to A
Abort
D D
Wait for Wait for
D to E
Contact Contact
Closure Closure
With no reactor
phase error < se ng for 3 seconds
(line contactor close enable)
Up Transfer State Diagram
A
A to B
frequency error < 0.5 Hz
B B
Wait for Wait for
Frequency Frequency
Lock Lock
frequency error ≤ 0.5 Hz
for 2 seconds
C to A
Abort
frequency error > 0.5 Hz
C C
Wait for Wait for
Phase Phase
Lock Lock
C to D
B to C
C to B
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