Controller Protection Controller Protection/Thermal Cutback
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MillipaK PUMP Controller Manual Page 35 07/11/05
Controller Protection Features
There are several in built features which are designed to protect the MillipaK controller from
damage due to excessive load currents, voltages and prolonged periods of high demand.
Temperature Monitoring
If the temperature of the power frame exceeds 75°C its maximum available current will be
reduced. Note, however, that if the set current limit is less than the maximum available current
limit actual cutback will occur at progressively higher temperatures than 75°C. The thermal
cutback ensures that the maximum heatsink temperature is limited to 90
°
C (See Graph). When
actual cutback occurs the diagnostic LED will flash 8 times.
Thermal Cutback Characteristic
Current Limit
0
10
20
30
40
50
60
70
80
90
100
70 75 80 85 90 95
Temperature (DegC)
Current Limit (%)
Current Limit
Maximum Temperature Logging
The system maintains a log of the maximum heatsink temperature measured by the controller. The
Maximum Temperature logged is displayed on the Calibrator next to Heatsink Temperature
measurement.
To reset the log select the Maximum Temperature Log reset item on the Calibrator. It will display
'Log'. Press the '+' button and the display will show 'Clr' for 2s before returning back to 'Log'. The
maximum temperature has now been reset to the current heatsink temperature.
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