Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 94)

94 Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014
Chapter 3 Component Definition and Maintenance
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.
Figure 79 - 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.
Mounting Screw
High Pressure Port
Wire Terminals
Flexible tube for low
pressure port