PCM-22 Software Setup
P/N 400274-01 Revision A7
47
Follower Sensor Averaging
This parameter determines how much the new measured length affects
the current operational
Follower Length
. The lower the average, the
faster length errors are corrected for. It will also filter out sensor and
machine anomalies.
Setting this value lower will adversely affect the drives ability to quickly
correct for phase errors. If it is too low, it will cause the system to over
compensate and “hunt” or wander around the
Cycle Point
. If the
averaging is set too high, it will cause the Follower motion to be sluggish
in response to changes in the Follower axis.
The
Follower Sensor Averaging
should never be less than two except for
diagnostic reasons. The range is from 1 to 8. See
Average Length,
the
FM13
serial command and
Maximizing Profile Performance
.
Phase Correction Limit
This parameter only applies if the
Master Cycle
and / or
Follower Cycle
is
Defined By a Registration Sensor.
When an input is received from either the
Zero Master Cycle
or
Zero
Follower Cycle
sensor and a difference is found to exist between the
corresponding
Average
Length
and the length determined by the new
Zero Master Cycle
or
Zero Follower Cycle
sensor input (i.e., the measured
length). The PCM-22 uses a percentage of that difference to correct for
the phase variation in the next corresponding Master or Follower cycle.
The
Phase Correction Limit
is used to limit the rate at which
phase
variations are corrected for in the next cycle and allow for smoother
operation. It is similar to a gain and is used to slow the rate of correction
for Follower phase variations and allow smoother operation. Small
amounts of Follower phase variation are normal.
Phase Variation = (Measured Length - Average Length) * Phase Correction Limit
The effects of adjusting this parameter are more noticeable at higher
speeds. When operating at high line speeds, rapid corrections for phase
variation are usually undesirable especially with high inertial loads.
The range is from 0 to 100 percent. See
Maximizing Profile Performance
.
Phase Distance Error Limit (+)
This parameter designates a maximum positive
phase variation from the
Cycle Point
. The total phase variation is the sum of Master phase
variation and Follower phase variation. When the total phase variation
is above this value, the Phase Distance Error Limit output function 44
will activate and it’s complement, the
In Phase
output function 24, will
deactivate. Exceeding this limit will not stop the Follower axis, however,
you may employ this output with outside logic to generate an
appropriate action. See
Maximizing Profile Performance,
the
FM7
and
FM8
serial command
s
.
Phase Distance Error Limit (-)
This parameter is identical to phase distance error limit (+), except that
it detects a negative deviation from the
Master Phase Distance
or
Working Offset
. See
Maximizing Profile Performance,
the
FM7
and
FM8
serial command
s
.
