Rockwell Automation SB3000 Configuration and Programming - Manual (Page 109)

Enabling the Voltage Loop F-1
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PPENDIX
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Enabling the Voltage Loop
The voltage loop in the PMI Processor is enabled using bit 0 of register 100/1100
(VDC_RUN@). The following conditions must be true before the loop can go into run
and must remain true during the entire time that it stays in run:
• AC power must be on.
• The pre-charge contactor must be closed. This occurs after the DC bus voltage is
stable. It does not require a command from the application task.
• The RPI input on the Resolver & Drive I/O module must be on. If it is not, bit 2 in the
Interlock register (205/1205) will be set.
• All other interlock tests must be passed. If they are not, the corresponding bits in the
Interlock register will be set. The interlocks tests are described in the section of this
manual covering register 205/1205.
If all of the above conditions are true, the DC bus is ramped up to the voltage
reference programmed into register 102/1102 (VDC_REF%). The ramp rate is
approximately 100V per second. Bit 0 in register 200/1200 (VDC_ON@) will be set
when the programmed value is reached.
Two tunable variables, UVT_E0% and OVT_E0%, determine the under and over
voltage threshold values during the ramp phase. If the voltage goes outside of these
limits, warnings will be reported in register 203/1203, bits 1 and 0, respectively.
If AC power is lost momentarily, the rectifier will go into standby (power dip ride
through). It will turn back on when the PMI Processor is resynchronized with the AC
line.
!
ATTENTION: The pre-charge contactor for the SB3000 must be closed
and the voltage loop must be on (register 200/1200, bit 0) before any
load inverters can be put into run. If the SB3000 pre-charge contactor is
not closed, running a load inverter will burn up the pre-charge resistors.
Failure to observe this precaution could result in damage to, or
destruction of, the equipment.