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Controller Protection
______________________________________________________________________________
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 either power frame exceeds 75 o 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 o C. The thermal
cutback ensures that the maximum heatsink temperature is limited to 90 o C (See Figure 6). When
cutback occurs the diagnostic LED will flash 8 times. Inspection of the calibrator fault messages
will indicate which unit is in thermal cutback.
Thermal Cutback Characteristic
100
90
80
70
60
50
40
30
20
10
0
70
Figure 6: Armature Thermal Cutback Characteristic
MillipaK 4QPM Controller Manual
Armature Current Limit
72
74
76
78
Temperature (DegC)
80
82
84
Armature Current Limit
Page 56
Temperature Monitoring
86
88
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13/08/03
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