Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control (PanelView 550) - Manual (Page 87)

Rockwell Automation Publication 7000-UM151E-EN-P - January 2013 87
Component Definition and Maintenance Chapter 3
Air Pressure Sensor
An air pressure sensor is located in the converter cabinet. It is located in the upper
left area near the uppermost inverter module.
Figure 65 - Air Pressure Sensor
The air pressure sensor measures the difference in air pressure between the front
and rear of the converter modules. It then sends a small direct current voltage
signal to the control circuits.
Rockwell Automation currently uses Ashcroft air pressure sensors. In the event of
reduced fan performance or air blockage, the sensor notes the reduced differential
pressure and triggers a warning message to the console. One likely cause of such a
performance reduction would be partially plugged filters at the air inlet.
If airflow becomes reduced to the point of risking thermal damage, the sensor
triggers a fault signal that shuts down the drive. Also, in the event of fan failure,
the sensor will detect the pressure change and stop the drive.
Replacing the Air Pressure Sensor
1. Remove the wires at the sensor and note their designation.
2. Disconnect the clear tube on the low pressure port. Remove the two
mounting screws of the sensor.
3. Check the integrity of the existing sealant where the clear tubing passes
through the sheet metal barrier.
4. Installing the replacement airflow sensor is in the reverse order of its
removal.
Flexible tube for
low pressure port
High pressure port
Mounting screw
Wire terminals