Atlas Copco Power Focus 3000 User Manual

Statistic
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19.2 Trend deviation alarm
Trend deviation check and alarm are measured and compared against X-bar and the range for the currently
used Pset.
7 points consecutively increasing
7 points consecutively decreasing
7 points consecutively above average (
X
and / or
R
)
7 points consecutively below average (
X
and / or
R
)
1 point outside
X
or
R
 2 sigma (sigma for the whole population)
Point = subgroup
The mean is the average of
x
and r
X
and
R
). This means that the SPC trend alarms cannot function until
the number of tightenings in the memory corresponds with the user-specified number of subgroup
parameters.
19.3 Calculation of UCL and LCL
Power Focus calculates recommended values for UCL and LCL. The operator can then choose if he wants
to use these values or enter another value.
Subgroup size, Subgroup frequency and number of subgroups parameters are used in the calculations.
19.4 Calculation of mean values
Power Focus calculates the mean values
X
and
R
. The operator can then choose if he wants to use these
values or enter another value. Sub group size, subgroup frequency and number of subgroups parameters
are used in the calculations.

Atlas Copco Power Focus 3000 Specifications

General

Brand	Atlas Copco
Model	Power Focus 3000
Category	Control Systems
Language	English