22 Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011
Chapter 1 Detailed Drive Operation
Troubleshooting a “MC Commissn Fail” Fault during Autotune
The “MC Commissn Fail” fault (23) occurs when either the Power Circuits
diagnostics test fails or one of the Motor Tests fails. To find out specifically why
the fault occurred, before clearing the fault, check the bits in the following
parameters: 463 [MC Diag Error 1], 464 [MC Diag Error 2], or 465 [MC Diag
Error 3].
Auxiliary Power Supply
You can use an auxiliary power supply to keep the 700S control assembly
energized when input power is de-energized. This allows the main control board,
controller and any feedback option cards to continue operation.
You must set Par 153 [Control Options], bit 17 “Aux Pwr Sply” to enable this
feature.
• Refer to the PowerFlex 700S Auxiliary Control Power Supply Installation
Instructions (Part Number: 20-24V-AUX1), publication 20D-IN021
for
installation information.
• Refer to the PowerFlex 700S AC Drive Phase II Control Frames 1…6
Installation Instructions, publication 20D-IN024
or the PowerFlex 700H
and 700S Frame 9…14 Drives Installation Manual, publication PFLEX-
IN006, for connection information.
Bus Regulation/Braking
Description
This information serves as a supplement to the PowerFlex 700S AC Drive Phase II
Control - Programming Manual, publication 20D-PM001
, addressing items
specific to the PowerFlex 700S drive bus regulation and dynamic braking. Please
refer to the Programming Manual for details on the 700S dynamic braking wiring
and setup and the PowerFlex® Dynamic Braking Resistor Calculator Selection
Guide, publication PFLEX-AT001
, for application techniques on dynamic
braking.
Technical Information
The bus regulator limits the maximum bus voltage for systems that do not have
(or have limited) braking or regenerative capabilities. The bus regulator limits the
bus voltage by comparing the DC bus voltage feedback to a DC bus voltage
reference. It then limits the regenerative power allowed back onto the DC bus to
keep the DC bus voltage at or below the reference value and prevent a “DC Bus
Overvolt” fault.
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