LNS GT 326-E, Инструкция по эксплуатации, Страница: 46 / 218

Chapter 5 PNEUMATICS
5 - 5
GT 326-E
5.3.2 Solenoid valve
Directly controlled by the PLC the solenoid valves activate the air cylinders.
To manually activate the air valve press button A.
Attention!
Activating valves requires special attention to prevent bodily injury or components damage.
This button could be locked in the activation position by pressing it down and turning 90°
clockwise. To unlock turn the button it 90° counter clockwise. This device is proved to be useful
during testing, connection or troubleshooting. Normal pneumatic cylinder returns to its original
position when releasing the button (except for pneumatic cylinder activated by double-effect
solenoid valve).
5.3.3 Air pressure switch, SP1
To guarantee the compressed air is supplied to the bar feeder
the pressure switch confirms the pressure is sufficient.
The pressure switch engages when the pressure is larger than
4 kg/cm
2
(4 bar). If the pressure is below 4 kg/cm
2
, the switch
will disengage and the emergency stop circuit will be
interrupted. An alarm AL05 will be displayed on the HMI
screen.
Settings of operating pressure range
1. Set the operating pressure at 4 kg/cm
2
(4 bar) with screw A
The pressure switch will sense the operating pressure
within a few seconds.
2. Set the lower pressure limit with screw B.
This setup will define when the pressure switch senses an
abnormal pressure drop and generate a low pressure
alarm.
Factory setup is: 3 kg/cm
2
(3 bar).
A
A
B