Rockwell Automation 1771-QA Stepper Positioning Assembly User Manual User Manual
Page 124
5–4
Troubleshooting
Publication 1771-UM002A–EN–P – May 2000
Programming
Error, Bit 04
Corrective Action
Possible Cause
System Fault,
Bit 03
1
1
Override ramp not acceptable
The actual executed ramp time of the first move of
an override moveset is generally not the value
programmed. Refer to override ramp time text and
equations section titled “Decel and Position
Considerations for a 0Hz Rate Move.”
1
1
Offset value, when added, causes a position
value greater than 999,999 or, when
subtracted, causes a position value less
than 0.
Use an initialization preset before starting a profile,
or initiate a move preset before the limit of 999,999
pulses is reached. Use the move preset again in
order to return to the home position.
1
1
0Hz rate move attempted in single step or
independent move.
Reprogram the move profile without the 0Hz rate
move.
1
1
Attempted to begin a move profile when the
position in status block is negative possible
caused by previous jog reverse command.
After a reverse jog to a negative position, an
initialization preset or a move preset in the first
move block must be executed to start the profile at
a positive position. A rest command can be used if
the profile starts at 0.
1
1
0Hz rate move not acceptable
Position values could be too small to allow 20msec
of final rate, or too large which would cause the
actual executed decel time to be greater than 9.99
seconds. Programmed ramp and decel times are
ignored. Use 0Hz rate equations to check data.
WHEN SYCHRONIZING AXES
1
0
Sent software jog or initialization preset
command while one of the axes was
executing a profile.
These commands can only be sent to an axis when
all axes are at rest (not executing a profile).
1
0
Attempted to start a synchronized sequence
with non-sync data or no data previously
loaded to an axis.
All axes must be loaded with sync data of the same
mode or all axes with non-sync data. If desired, an
axis or global reset will clear all data stored in the
controller module for all axes.
NOTE: If LEDs illuminate during operation, refer to appropriate LED combination in Table 5.A, Power-up
Troubleshooting.