MKS T3PIA, Instruction Manual, Page: 41 / 70

Top Panel Components Chapter Three: Product Overview
33
Valve Position Indicator LEDs
The OPEN indicator light, located to the left of the manual valve switch, illuminates red when the valve is
fully open. The CLOSE indicator light is located to the right of the manual switch and illuminates red when
the valve is in the fully closed position.
Manual Valve Switches
These push button style switches allow you to manually drive the valve to the open or closed position.
Trip Point Indicator LEDs
These LEDs illuminate green when a trip point is energized.
Position Status LED
The Position Status LED illuminates a solid green when the device is in Position Control Mode. If interlock is
not enabled, the Position Status LED illuminates a solid red. The Position Status LED illuminates a solid
red/green when the device is learning valve steps.
Table 16: Position Status LED Indicators
LED State Meaning
Solid Green Position Control Mode
Flashing Green —
Solid Red Unrecoverable fault
Flashing Red Interlock not enabled
Off No power, if Pressure Status LED also off
Red/Green Learning valve steps
Pressure Status LED
The Pressure Status LED illuminates a solid green when the device is in Pressure Control Mode (Model
Based). The LED flashes green when the device is in Pressure Control Mode (PID). If a fault condition is
detected, the Pressure Status LED illuminates a solid red. If there is no power, the Pressure Status LED (and
Position Status LED) is off. The Pressure Status LED illuminates red/green when the device is learning
conductance.
Table 17: Pressure Status LED Indicators
LED State Meaning
Solid Green Pressure Control Mode (Model Based)
Flashing Green Pressure Control Mode (PID)
Solid Red Unrecoverable fault
Flashing Red Interlock not enabled
OFF No power, if Position Status LED also off
Red/Green Learning conductance