PMA KS 98, Manual

Page: 148 / 246

Change mode (ramp/step)
If the set-point shall change in a step or ramp is deter-
mined by a parameter (
Wmode
) valid for all segments of a
recipe (default: ramp).
Ramp: The set-point changes linearly from the start (end
value of previous segment) to the end value of the relevant
segment in time
Tp
. For the first segment, the following
gradient is applicable: (
Wp1
-
Wp0
) /
Tp1
Step: The set-point goes to value
Wp
immediately at seg-
ment start and maintains it during segment time Tp .
Operation preparation and end position
Each program starts at an initial position
Wp0
, which is used and maintained with reset or first programmer set-up.
With program start from rest position, the first programmer segment runs from the instantaneous process value at the
time of start command („ramp“ with gradient (Wp1 - Wp0) / Tp1). With step change mode, the set-point of the first
segment is activated immediately.
At program end, either
w
the set-point of the last segment is maintained (
r
see below ),
w
or the programmer goes to rest position
Wp0
(
r
see below ) dependent of configuration (
PEnd
). The
program can be started either by entry of run (control input switch-on or off or front-panel operation) or
preset.
Programmer
9499 040 50611
APROG ( analog programmer ) / APROGD ( APROG data ) 148
Tp3
Wp3
Wp2
Wp3
Wp2
Segment 3
Start End
Tp2 Tp4
Ramp
Step
Segment parameters
Wp0 Wp1 Wp2 Wp3 Wp4 Wp5 ...
Tp1 Tp2 Tp3 Tp4 Tp5 ...
Preparation for
operation
elapsed
program time
Program
START
Program
END
Time
Wp0
Operation
RESET
Process value x
RESET
PRESET PRESET
Profile with stop at end position
Profile with automatic reset at program end