1. Once the M1 acknowledge is received, M4 is commanded to open.
2. With the acknowledge of M4 open, the following checks occur:
– input voltage must be above 80%
– pre-charge contactors (M2, M3, and M4) must all be open
– SOP ag MainInputVoltageDisable_O must be false.
3. Pre-charge is complete, the PrechargeComplete_I ag is set true and the drive is connected
to the MV source and ready to run. The pre-charge state machine is exited and the exit state
is recorded in the event log along with all other recorded pre-charge events in the sequence.
Note
The drive run is inhibited until pre-charge completes successfully.
On a successful pre-charge, the state machine remains in PC_COMPLETE until reset. It will cycle
back to pre-charge faulted (without fault) to begin again.
Setting Parameters for Type 6 Pre-charge
Use the following parameter settings to operate type 6 pre-charge. Refer to Cell Menu (2520) in
Section Options for Drive Menu (2) of Chapter Parameter Assignment / Addressing for
parameters associated with this function.
• For normal operation:
– Pre-charge Enable (2635) to "Type 6 Closed".
– Use type 6 pre-charge for any cell type, but cell voltages (2550) "750V AP" and "750V AP
4Q" must use either type 5 or type 6 pre-charge. These are the two settings that are
dened for the water-cooled 6SR325 drive.
• For maintenance or service operation:
– Precharge Service Mode (2637). This parameter completes pre-charge with M4 closed.
M1 never closes. Use for troubleshooting purposes only.
– Pre-charge Service Start (2638). This parameter starts the service mode of pre-charge
from the menu instead of through an SOP ag.
NOTICE
Changing drive parameter settings
Do not change drive parameter settings.
Only Siemens trained personnel are authorized to change drive parameter settings.
See also
Pre-charge using Dedicated I/O (Page 269)
Advanced Operating Functions
8.17 Synchronous Transfer
NXGPro+ Control Manual
Operating Manual, A5E50491925A 287
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