Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control - Manual (Page 90)

90 Rockwell Automation Publication 7000-UM202B-EN-P - June 2014
Chapter 3 Component Definition and Maintenance
Temperature Sensing Thermal sensors are available on one heat sink in the rectifier and one heat sink in
the inverter. The thermal sensors are mounted on the heat sink with the
temperature feedback board, or on the SPS mounting bracket which is mounted
to the heat sink, if equipped.
Replacing the Thermal Sensor
1. Ensure there is no power to the equipment.
2. Remove the heat sink with the thermal sensor from the PowerCage. If
equipped, first remove the SPS mounting bracket.
3. Remove clamp load ( Figure 81 on page 89 ).
4. Remove the device (SGCT or SCR) from the heat sink with the thermal
sensor.
5. Disconnect the fiber optic cable to the temperature feedback board.
6. Remove two M8 screws holding the heat sink in place.
7. Remove the heat sink with the temperature feedback board (may be on the
SPS bracket, if equipped) from the PowerCage.
8. Disconnect the plug connecting the thermal sensor and circuit board.
9. Remove the screw attaching the thermal sensor to the heat sink.
10. Replace with the new thermal sensor and cable assembly.
11. Note the small voltage difference between the thermal sensor and its heat
sink. For proper function, mount the small insulating pad between the
thermal sensor and the heat sink, and the insulating bushing between the
thermal sensor mounting screw and the thermal sensor.
12. Reverse the removal order to replace the heat sink with the new thermal
sensor.
13. Follow procedure Uniform Clamping Pressure on page 88 to clamp the
heat sinks to a uniform pressure.
ATTENTION: To prevent electrical shock, disconnect the main power before
working on the drive. Verify that all circuits are voltage-free using a hot stick or
appropriate voltage-measuring device. Failure to do so may result in injury or
death.