Rockwell Automation SB3000 Configuration and Programming - Manual (Page 107)

SB3000 Pre-Charge Sequencing E-3
Load Inverter Pre-charge Contactor Requirements
The status of the SB3000 Rectifier pre-charge contactor (CHG_FB@) must be
checked by the inverter application tasks. The load inverters must not operate with the
rectifier pre-charge contactor open. Doing so may damage the pre-charge resistors. It
is the responsibility of the application tasks to ensure that the Rectifier is in run before
a load inverter is turned on.
If the rectifier is shut down on a fault condition, the application is responsible for a
controlled shut down of the inverter.
Note that each load inverter must also be provided with its own pre-charge resistor
and contactor to limit the current into its capacitors.
Pre-charge Contactor Sequencing During the Bridge Test
When the bridge test is commanded in register 100/1100, bit 2, the pre-charge
contactor will close. After the results of the test have been displayed on the
corresponding GDI module(s) LEDs, the pre-charge contactor will be opened.
!
ATTENTION: The UDC application task must examine the pre-charge
status bit (CHG_FB@) regularly. If the status bit turns off, the load
inverters must be shut down. If the inverters are not shut down, the pre-
charge resistor may be damaged. Failure to observe this precaution
could result in damage to, or destruction of, the equipment.