Ytc YT-1000 series, Руководство по эксплуатации продукта

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Smart Positioner
YT-1000 / 1050 series Product Manual
Ver. 1.04 60
9. Troubleshooting

Positioner does not respond to the input signal.
1) Check supply pressure level. The lever must be at least 1.4 Kgf/cm
2
. For spring-return
type of actuator, the supply pressure level has to be larger than the spring’s specification.
2) Check if input signal is properly supplied to the positioner. The signal should be 4~20mA
DC.
3) Check if zero point or span point is properly set.
4) Check if the posi
tioner’s nozzle has been blocked. Also, check if the pressure is supplied
to the positioner and pressure is being exhausted through the nozzle. If the nozzle has
been block by any substances, please send the product for repair.
5) Check if feedback lever has been installed properly.

The pressure of Out1 reaches Supply pressure level and does not come back down.
1) Check auto manual switch. If the switch has been damaged, replace the switch or pilot
relay valve.
2) Check for a gap or damages between the nozzle and the flapper. If damaged, please
send the product to the corresponding local Young Tech Co., Ltd office or main office in
South Korea for repair.

The pressure is exhausted only by Auto manual switch.
1)
Check if the positioner’s nozzle has been blocked. Also, check if the pressure is supplied
to the positioner and the pressure is being exhausted through the nozzle. If the nozzle
has been blocked by any substances, please send the product to the corresponding local
Young Tech Co., Ltd office or main office in South Korea for repair.

Hunting occurs.
1) Check if safety spring has been displaced. (Next to Pilot unit)
2) Check if the size of actuator is too small. If so, insert an orifice in order to reduce the
pressure flow rate.
3) Check if there is any friction between the valve and the actuator. If so, increase
actuator’s size or reduce the friction level.

The actuator moves only to full open and full close positions.
1) Check if Span or Cam of the positioner is installed correctly corresponding to direct or
reverse acting of the actuator. If not, refer to 7.1.2 or 7.1.2 section.