Ytc YT-1000 series, Руководство по эксплуатации продукта

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Smart Positioner
YT-1000 / 1050 series Product Manual
Ver. 1.04 59
8. Maintenance
8.1
Pilot valve
1. If Supply air pressure is not stable or Supply air is not clean, the positioner may not
function properly. Air quality and pressure should be checked regularly to see if the air is
clean and pressure set is normal.
2. If the pilot valve has to be removed from the unit, be cautious not to lose the O-ring
attached to rear side of the pilot valve and the stabilize spring between the pilot valve
and the torque motor.
3. On the back of the Auto Manual switch, there is a fixed orifice (0.3 pie) which could be
clogged with dusts and other substances and lead to malfunction of the positioner. First
of all, remove the pilot valve from the positioner and see if the holes on the screens are
not clogged. If the screens are clean and the positioner is not functioning, remove the
Auto-Manual switch and check the back of the switch and see if the orifice is clean.
Clean the orifice with air and reassemble the switch and the pilot valve to the positioner
and test once again. If the unit is still not working, use a 0.2 pie drill or pin and insert into
the orifice hole at the back of the Auto-Manual switch.
Fig. 8-1: Pilot unit and Auto manual switch
8.2
Seals
Once a year, it is recommend to check if there are any damaged parts of the positioner. If
there are damaged rubber parts such as diaphragms, o-rings, packings, replace with new
ones.