U511 User’s Manual Parameters
Version 1.1 Aerotech, Inc. 4-77
4.10.6. “RMS current sample time” (1-16,383 ms)
Parameter x49 sets the RMS current sample time. This time represents the span over
which the RMS current must remain below the RMS current limit (calculated using
parameter x48), otherwise an “RMS Current Level Exceeded” fault will occur. A fault
may occur before the sample time expires. This occurs if the accumulated RMS current
level for the present sample period exceeds the corresponding RMS level for the
fractional portion of the sample time (e.g., twice the level for half the time, three times the
level for one third the time, etc.). Refer to Figure 4-9.
The “RMS current sample time” parameter may be referred to as the thermal time
constant. This name reflects the function of the parameter because the RMS current
drawn by a motor over a period of time will tend to heat up the motor. Therefore, the
operator should choose a parameter value that will cause a fault before the motor
overheats and fails.
This parameter value can range from 1 to 16,383 ms. The default value is 10,000 ms (or
10 seconds). Refer to Table 4-58.
Table 4-58. Settings for Parameter x49
Param # Axis # Range Default
149 1 1 to 16,383 ms 10,000 ms
249 2 1 to 16,383 ms 10,000 ms
349 3 1 to 16,383 ms 10,000 ms
449 4 1 to 16,383 ms 10,000 ms
This parameter is used in conjunction with parameter x48 to determine RMS
current level faults.
x49
E
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