Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 343)

Component Definition and Maintenance 6-53
7000 “B” Frame 7000-UM150I-EN-P – June 2013
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.
Flexible tube for
low pressure port
High pressure port
Mounting screw
Wire terminals
Figure 6.39 – Air Pressure Sensor
The air pressure sensor compares the air pressure in front of the
converter modules with the air pressure behind the converter
modules. A small direct current voltage signal is transmitted to the
control circuits.
There have been two different air pressure sensor manufacturers –
Ashcroft and Greystone. Ashcroft is our current pressure transducer
manufacturer.
In the event of reduced fan performance or air blockage, the
measured differential pressure will be reduced and a warning
message will appear on the console. A likely cause of the warning
message would be laden filters at the air inlet.
If airflow becomes reduced so that there is risk of thermal damage,
a fault signal will cause drive shutdown. Also, in the event of fan
failure, the sensor will detect the pressure change and the drive will
be stopped.
Air Pressure Sensor Replacement
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 sealant that has been applied where the
clear tubing passed through the sheet metal barrier.
4. Installation of the replacement airflow sensor is in the reverse
order of its removal.