Perform these steps if you have the Automatic - Air Clamp Provision.
Press SETTING and set Setting 276 Workholding Input Monitor to 15.
The clamp force of the Pneumatic Vise can be adjusted by adjusting the Air Regulator on the Clamp/Unclamp solenoid. The higher the pressure, the greater the clamp force.
Verify the pressure switch functions by running the spindle in MDI: M03 S100;
Lower the air pressure all the way by turning down the regulator until the machine alarms with Alarm 180 Fixture Not Clamped. Adjust the pressure back to the desired pressure.