Badger Meter SRD/SRI Valve Positioners User Manual
Page 58
Table 4: Allocation of the parameter values to coding:
In LCD shown values:
[in Menu Nr.]
Code
LEDs
1 2 3 4
P
[6.2]
P
[6.1]
Tn
[6.4]
Tn
[6.3]
(sec)
T63
[6.6]
T63
[6.5]
(sec)
Dead band
[6.7]
(%)
1
1 0 0 0
2
1
0.1
0
2
0 1 0 0
2.66
1.33
0.15
0.12
3
1 1 0 0
3.50
1.75
0.25
0.16
4
0 0 1 0
4.7
2.4
0.35
0.22
5
1 0 1 0
6.3
3.2
0.5
0.3
6
0 1 1 0
8.4
4.2
0.75
0.4
7
1 1 1 0
11.2
5.6
1.15
0.53
8
0 0 0 1
15
7.5
1.75
0.7
9
1 0 0 1
20
10
2.6
0.94
10
0 1 0 1
26.6
13.3
3.9
1.25
11
1 1 0 1
35.5
17.8
5.9
1.67
12
0 0 1 1
47.3
23.7
8.85
2.22
13
1 0 1 1
63.1
31.6
13.3
2.96
14
0 1 1 1
84.2
42.1
20
3.95
15
1 1 1 1
112.2
- off -
30
5.3
Remarks to Controller Tuning
If AUTOSTART does not find the optimum setting the following may be the result:
A) slow 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 operated directly without controller via Menu 7 and the valve movement may be assessed
In case of 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 the actuator spring force and friction?
Remedy through increasing air pressure
3 Is the actuator volume high, possibly requiring an increased air capacity for fast valve movement?
Remedy: through booster, see accessories, or spool valve option
4 Was AUTOSTART performed in Menu 2 and did messages 8 resp 9 occur (messages, see table)?
Remedy: “AUTOSTART” in Menu 2 resp 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 filter blocked?
8 Has the supply air been contaminated by small oil drops, particulate or are pneumatic parts possibly blocked?
Remedy: exchange pneumatic parts; possibly use a suitable air supply station
Behaviors B) and C) check:
1 Is the air capacity possibly too high, e g through spool valve or booster?
Remedy: Work, if necessary, without booster or use version without spool valve
Operation
Page 58
August 2014
POS-UM-00010-EN-03