<5. Maintenance>
5-6
IM 02M04B01-01EN
(2) Alignment Procedure On-Off Controller
1
2
Set point knob
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1. With control dial set at rectangular mark in
sector being used, adjust set point knob (or
remote set point, if present) so that output is 20
to 100 kPa.
2. Loosen lockscrew and adjust nylon eccentric
so that set point index is aligned with
measurement pointer (see bottom illustration).
(3) Alignment Procedure-Differential Gap
Controller
The graduations on the control dial indicate the
approximate gap width. This alignment consists of
adjusting the actual gap width and one control point
to the desired values.
Measurement
pointer
Set point knob
Set point index
Output gauge
2
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1. Set gap width dial at desired value and in sector
to be used.
2. Disconnect measurement link at control unit.
Note hole link is in.
3. If dial is set in black sector, adjust set point knob
(or remote set point, if present) so that index is
at desired lower control point; if in white sector,
at desired upper control point.
4. Apply 140 kPa to controller.
5. Move measurement pointer slowly by hand
from one end of scale to other end and then
back again. Note scale readings at the two
control points (where output changes abruptly;
output is either 0 or 140 kPa).
The difference between these readings divided
by span is actual gap width.
EXAMPLE: Scale = 20 to 120
Control points = 70 and 90
Gap width =
90 - 70
= 20%
120 - 20
If gap width is not satisfactory, adjust control
dial in correct direction and repeat Step 5 until
gap width is satisfactory.
6. If control action does not occur at set point
index position, readjust set point knob (or
remote set point, if present) until action occurs
at correct value of measurement.
Eccentric
Lockscrew
7
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7. Set point index and measurement pointer
should coincide when control action occurs. If
necessary, loosen lockscrew and adjust nylon
eccentric to align index with pointer at control
point.
8. Reconnect measurement link.
(4) Checking the Batch Attachment Operation
(Operating Pressure 1.0 kgf/cm
2
(100 kPa,
1.0 bar, 15 psi)).
a) Apply a pneumatic pressure of 1.4 kgf/cm
2
(140
kPa, 1.4 bar, 20 psi) to the instrument.
b) Set the controller proportional band to 50% and
fully open the reset restrictor. Set the pointer
and the index to 50% and wait for the output
pressure to stabilize at 0.6 kgf/cm
2
(60 kPa, 0.6
bar, 9 psi).
c) Set the target value to 75%. The output
pressure must be 1.0 kgf/cm
2
(100 kPa, 1.0
bar, 15 psi) . Then, change the set value from
75% to 80%. The output pressure remains
unchanged at 1.0 kgf/cm
2
(100 kPa, 1.0 bar,
15 psi). This output pressure represents the
operating point of the batch attachment.
