Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive - Air-Cooled (A Frame) - Manual (Page 278)

5-36
Component Definition and Maintenance
7000A-RM001A-EN-P – January 2011 7000 “A” Frame
Air Pressure Sensor An air pressure sensor is located in both the converter cabinet and the
integral rectifier transformer cabinet (if applicable). In both cases, it is
located in the upper left-hand quadrant of the cabinet.
Flexible tube for
low pressure port
High pressure port
Mounting screw
Wire terminals
Figure 5.29 – Air Pressure Sensor
The air pressure sensor measures the difference in air pressure between
the front and rear of the converter modules/integral rectifier transformer.
A small direct current voltage signal is transmitted to the control circuits.
In the event of reduced fan performance or air blockage for either the
converter or the transformer, 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 inlet.
If, as a result of blockage or fan failure, flow becomes so reduced that
there is a risk of thermal damage for either the converter or transformer, a
fault signal will cause drive shutdown.
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.