Rockwell Automation Publication 2198-UM002L-EN-P - October 2021 393
Appendix E Regenerative Bus Supply Sequence Operation
Precharge
When initialization is complete, the contactor enable relay closes, causing the
M1 contactor to close, and precharge begins through the DC-bus resistor (see
Regenerative Bus Supply Configuration
on page 326 for an example
interconnect diagram).
There is approximately 2.4 seconds of DC-bus precharge time plus 1.0 second
relay-closing time for approximately 3.4 seconds total precharge time. This is
consistent across all four 2198-RPxxx units.
The DC-bus resistor is not field replaceable nor can we measure the resistance
externally. Once in the PRECHARGE state, the DC Bus Up status goes high and
the regenerative bus supply transitions to the START INHIBITED state.
Start Inhibited
The digital inputs associated with the regenerative bus supply can be
configured to cause the Converter Axis CIP Drive to go to a START INHIBITED
state.
Figure 205 - Configure Digital Inputs
Enable is the default setting for Digital Input 1. When the Enable input is wired
in the system it provides the ability to physically control the transition into the
RUNNING state.
External 24V DC to IN1 on the IOD connector through the Enable permissive
circuit (possibly a red top mushroom E-stop) with 24V DC common to COM on
the Digital Inputs (IOD) connector is required to remove the START
INHIBITED condition.
See Contactor Wiring for Regenerative Bus Supply
on page 336 for an example
of how the digital input option is used.
If no Enable digital input is assigned or the correct inputs are seen, the
regenerative bus supply moves to the STOPPED state.
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