Velocity Processor (Vp-Xx) - Allen-Bradley 1395 Troubleshooting Manual

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2-12 Malfunctions with Indications
System Processor Faults
No.
SP-87
SP-90
SP-91
Velocity Processor (VP–XX)
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Name Description
Diag Adapter A An internal communication error between
Mbus (Hard) the System Processor and the Port A
Adapter board has occurred during
power-on.
Serial WDG Internal processor error was detected and
Warning corrected. Operation is unaffected.
(Warning)
Serial WDG Soft Internal processor error detected. A
(Soft) controlled motor stop will be initiated.
The Velocity Processor is responsible for fault monitoring of control
variables throughout the drive. This includes monitoring velocity control,
armature and field outputs to the motor, incoming line conditions, and
communications to the System Processor and Current Processor. These
faults can be induced by problems external to the immediate drive such as a
malfunction of a feedback device, excessive load on the motor, incoming
line variations, etc. An attempt to identify and correct these conditions, if
applicable, must be done prior to replacing components in the drive.
Internal processor faults that occur can be induced by Electrostatic
Discharge (ESD), Electro Magnetic Interference (EMI), excessive heat,
contamination of printed circuit boards (PCB), improper or damaged
connections, etc. An attempt must be made to correct any of these
environmental conditions prior to replacing components in the drive. This
can help reduce the possibility of reoccurrence.
Faults VP-10 through VP-24 are reported in parameter 101 "Drive Fault"
when parameter 630 "Fault Report" is set to a value of 1. The bit
assignments for parameter 101 are given in ( ) where applicable. See Fault
Type Selection.
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Recovery
Execute System RESET or cycle power
and attempt normal operation. Check the
ribbon connector that plugs into J7 on the
Main Control Board and the Adapter
Board, replace if damage is suspected. If
the fault reoccurs check grounding first,
then replace the Adapter Board. If the
fault still occurs, replace the Main Control
Board.
No action is required.
Execute a Clear Fault and attempt
normal operation. If the fault reoccurs,
replace Main Control Board.