Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 84)

84 Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014
Chapter 3 Component Definition and Maintenance
Temperature Sensing Thermal sensors are located on heatsink(s) in the converter. The thermal sensor is
mounted on the heatsink with the temperature feedback board.
Replacing the Thermal Sensor
1. Ensure there is no power to the equipment.
2. Remove the SPS bracket first, if installed. The heatsink with the thermal
sensor must be removed from the PowerCage. Remove clamp load (refer to
Figure 71 ).
3. Remove the device (SGCT) that is secured to the heatsink with the thermal
sensor.
4. Disconnect the fiber optic cable to the temperature feedback board.
5. Remove two M8 screws holding the heatsink in place.
6. Remove the heatsink with the temperature feedback board from the
PowerCage. If SPS is equipped, the heatsink is on the SPS mounting
bracket.
7. Disconnect the plug that connects the thermal sensor to the circuit board.
8. Remove the screw that attaches the thermal sensor to the heatsink.
9. Replace with the new thermal sensor and cable assembly.
10. Note there is a small voltage difference between the thermal sensor and its
heatsink. For proper function, it is essential to mount the small insulating
pad between the thermal sensor and the heatsink and the insulating
bushing between the thermal sensor mounting screw and the thermal
sensor (see
Figure 72 ).
11. Replacement of the heatsink with the new thermal sensor is in the reverse
order of removal.
12. Follow procedure Uniform Clamping Pressure on page 82 to ensure the
heatsinks are clamped to a uniform pressure.
ATTENTION: To prevent electrical shock, ensure the main power has been
disconnected 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.