Preconditions For Pre-Charge Types 5 And 6 - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

Advanced Operating Functions
8.19 Pre-charge using Dedicated I/O
• StartCellPrecharge_O – flag set to initiate precharge – remove after complete
• PrechargeLimitationEnable_O – flag set to enable the precharge limiting algorithm
• PrechargeComplete_I – Indicates that precharge is completed (M1 closed and MV above 80%)
• CimvPulsedOutputEnable_O – Set this true if CIMV requires a pulsed output
Dedicated I/O used in Precharge:
• Output to M1 Permissive – SIB 51, 53, 55 (TIMV)
• Output to close M1 – DO-14 – J4-7, 8, 9 (CIMV) – Pulsed or maintained – SOP selection (for
pulsed)
• Output to trip LFR – DO-15 – J4-10, 11, 12 (LFRInputProtect)
• LFR status – DI-3E – J9-4
See also
Type 5 (Open) Pre-charge (Page 276)
Preconditions for Pre-charge Types 5 and 6 (Page 273)
8.19.5

Preconditions for Pre-charge Types 5 and 6

Aside from safety concerns, and assuming that input power is available, the following conditions
need to be met to initiate pre-charge types 5 and 6. Monitor the entire pre-charge sequence
through an externally connected monitor or through the Debug Tool set to the "Drive Misc Status
Flags 2" using Ctrl-Y on the keyboard or menu selection in the tool.
Note
Operating pre-charge applications with inductor usage
In some applications the pre-charge capacitors have been replaced with inductors. In these
applications it may be necessary to operate pre-charge Type-5 and Type 6 with the M3 contactor
closed for longer periods. Extending the time M3 is closed reduces the current transient through
the pre-charge circuit breaker when M4 closes. The time M3 is closed is extended by holding off
the closing of the M4 contactor. The parameter "Prechrg M4 Holdoff time" (ID 2633) may be used
to specify the amount of time M3 is closed during pre-charge. Parameter 2633 may be adjusted
from 0 to 10 seconds where the default value is 0 seconds which is the value used for the
standard pre-charge arrangement (capacitors vs. inductors).
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