• StartCellPrecharge_O – ag set to initiate precharge – remove after complete
• PrechargeLimitationEnable_O – ag 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 o
the closing of the M4 contactor. The parameter "Prechrg M4 Holdo 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).
Advanced Operating Functions
8.19 Pre-charge using Dedicated I/O
NXGPro+ Control Manual
302 Operating Manual, A5E50491925A
To Next Page
Loading...
