Rockwell Automation Publication 7000-UM202H-EN-P - November 2023 107
Chapter 2 Power Component Definition and Maintenance
The color codes of the connectors are:
BLACK or GREY – is the transmitting end of the fiber optic.
BLUE – is the receiving end of the fiber optic.
Air Pressure Sensor An air pressure sensor is located in the converter cabinet. The sensor is located
in the upper left area near the uppermost inverter module.
Figure 97 - Air Pressure Sensor
The air pressure sensor measures the difference in air pressure between the
front and rear of the converter modules. The sensor 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.
Wire terminals
Flexible tube for low
pressure port
High pressure port
Mounting screw
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