Owner's manual

Table 4: Allocationofthe parameter values to coding:
In LCD shownvalues: [inMenuNr.]
Code
LEDs
1234
P
[6.1]
P
[6.2]
Tn
[6.3]
Tn
[6.4]
(sec)
T63
[6.5]
T63
[6.6]
(sec)
Dead band
[6.7]
(%)
1 1000 210.
10
2 0100 2.66 1.33 0.15 0.12
3 1100 3.50 1.75 0.25 0.16
4 0010 4.72.4 0.35 0.22
5 1010 6.33.2 0.
50
.3
6 0110 8.44.2 0.75 0.4
7 1110 11.2 5.61.1
50
.53
8 0001 15 7.51.7
50
.7
9 1001 20 10 2.
60
.94
10 0101 26.6 13.3 3.
91
.25
11 1101 35.5 17.8 5.
91
.67
12 0011 47.3 23.7 8.85 2.22
13 1011 63.1 31.6 13.
32
.96
14 0111 84.2 42.1 20 3.95
15 1111 112.2-off- 30 5.3
Allocation of the parameter values to coding
Remarks to Controller Tuning
If AUTOSTART does not find the optimum setting the
following may be the result:
• A) small response to setpoint, long positioning time or
long neutral time
• B) continuous oscillation following setpoint jump
• C) wide and high overshoot
For the assessment of the control 12.5% jumps in both
directions may be performed in Menu 8. The valve dynamics
may be observed at LCD or the mechanical indicator.
Prior to changing parameters for valve dynamics a number
of items are to be checked, see below. The pneumatic output
can be approached directly without controller via Menu 7
and the valve movement may be assessed.
For behavior A) check:
1. Is the Proportionate gain P (Menu 6.1) or P  (Menu 6.2)
too small?
Remedy: Increase parameters according to chart 4.
2. Is the air pressure high enough to possibly overcome
trouble-free the actuator spring force and friction
(dimensioning)?
Remedy: Increase the air pressure.
3. Is the actuator volume high, possibly requiring an
increased air capacity for fast valve movement?
Remedy: Through booster, see accessories.
4. Was AUTOSTART performed in Menu 2 and did messages
8 or 9 occur?
Remedy: AUTOSTART in Menu 2 or observe information
in table.
5. Has the parameter for the positioning time been set at a
value too high?
Remedy: Decrease both parameters T63 in Menu 6.5 or
6.6.
6. Is valve packing too tight resulting in a very high friction?
7. Is the supply air lter blocked?
Remedy: See "Supply Filter Replacement" on page 54.
8. Has the supply air been contaminated by small oil drops
or particles or are pneumatic parts possibly blocked?
Remedy: Exchange of pneumatic parts; possibly use a
suitable air supply station.
For behaviors B) and C) check:
1. Has the air supply pressure been set too high?
Remedy: Reduce pressure or install pressure reducer.
2. Is the proportional amplication in Menu 6.1 or 6.2 too
high? The values can possibly be at Code 15.
Remedy: Reduce the amplication.
3. Is the air capacity possibly too high, for instance, through
spool valve or booster?
Remedy: Work, if necessary, without booster or use
version without spool valve.
Changing valve dynamics during behavior A):
If valve has a high friction (for example, often the case in
small rotary actuators due to low air supply pressure or due
to a valve seat packing which is too tight) then the valve
position gets stuck after a setpoint jump and possibly is
recontrolled via the resetting time Tn, possibly after quite
some time has elapsed.
Page 47
Startup
August 2014 POS-UM-00009-EN-02