SS2L / SS2R Series
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13.2 Checking Diagram for Stable Valve Control
13.2.1 Judgment of Valve Specifications
– Set in Control Mode considering a strength degree of packing and a size of actuator.
(C/MD–11.5.20)
13.2.2 Judgment of Control Status
– Check operation with 4-20mA input signals after auto-calibration.
– In case of poor control (hunting / oscillation),
1) Adjust the valve by using Grop-Gain or PID-Gain as shown at Stpe 1. (PID–11.5.9)
(Keep pushing the UP button for 3 seconds to advance into “GROP”)
2) If the valve doesn’t work properly, try to set in Control Mode and change to other valve
working condition again.
(Note that it is necessary to perform auto-calibration again in case of change of Normal
→ Hard or Small → Hard)
Status
Action
An actuator is small and responds fast. And a hunting problem
happens.
SWST – ON
SPED – Adjust
11.5.12
11.5.11
A valve doesn’t move smoothly even in HARD mode due to a
very strong packing.
FDGN – Re-adjust
11.5.19
A valve moves too slowly in HARD mode.
HBIS – Re-adjust
11.5.18
MONT is shown and auto-calibration fails to carry out.
Re-mount
7.1.7
NORMAL MODE
HARD MODE
SMALL MODE
Auto-Calibration
4 - 20mA Control test
Grop-Gain
(Push UP button 5sec)
Hard
Low
Hunting
Oscillation
Poor control
Step 1.
Poor control
Step 2.
Auto-Control
Good control
PID-Gain Setting
Or