MAR-IN Controls SG 6100, Техническое руководство

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PNEUMATIC CONTROLLER
SERIES SG6100
Page: 10
MAR-IN CONTROLS B.V. VAN UTRECHTWEG 8 –10 KRIMPEN A/D IJSSEL THE NETHERLANDS
Tel. + 31 (0)180 - 51 71 51 Fax +31 (0)180 - 51 89 14 info@mar-in-controls.com www.mar-in-controls.com
Start-up procedure
- Position the Set Pointer at the lower end of the scale using the knob (3).
- Turn on the air supply, 1.4 bar
- Open the shut-off valves around the control valve
- Adjust the Set Pointer gradually upscale until the index is at the required value.
Tuning the controller settings for optimum control
Proportional Controllers
a) Move the Set Pointer either up or down scale of the quantity omitted by process.
b) The movement causes variations in the out put signal (indicated by gauge) and in the measure
(indicated by process pointer).
c) If the variations are persistent oscillations, double the BP value fixed before and return the set
pointer to its original position.
d) The set pointer and process pointer may not however be coincident. If this is the case adjust
the pre-load of proportional spring until the pointers are coincident.
e) If the variations obtained by b) are not persistent oscillations halve the BP value fixed before
and repeat a) until persistent oscillations are obtained. Make hence the operations c) and d).
Controllers with Proportional and Integral Action
a) Close the Integral Action valve fully to maximum time
b) Adjust the proportional band in the manner described in paragraph above.
c) Set the Integral Action time to 1 minute.
d) Move the Set Pointer either up or down scale of the quantity omitted by process.
e) Verify if that causes persistent oscillations. If this is the case double the I value and return the
set pointer to its original position. The coincidence between set and process pointers will be
made automatically.
f) If the Set Pointer shift obtained with the operation d) does not cause persistent oscillations
halve the I value until persistent oscillations are obtained. Make hence the operation e).
Maintenance
Periodic
- Clean the calibrated orifice on the output relay.
- Clean the relay.
- Clean the baffle and nozzle.
The frequency at which the above actions are taken is dependent upon the quality of the air supply
which should be clean, dry and oil-free
.