Applied Motion BLuAC5-Si - Manual (Page 30)

30
BLuAC5-Si Hardware Manual
920-0035E
12/10/2014
Setting Drive Current Limits
The BLUAC5 allows the user to set both the motor Continuous and Peak current limits. Cur-
rent settings are an RMS value. Using Si Programmer™ the current settings can be uploaded
and downloaded.
Setting the current limits requires the user to know the limitations of the motor. In most cases
referring to the motor manufacturers specification will give the proper information. For AMP
motors, motor settings are available in parameter files that are located on the PC where Si
Programmer™ was installed.
What is “Peak Current Limit”?
The BLUAC5 uses this current value to establish the maximum possible RMS current that
will be driven to the motor. The peak current time is set to one second. That is, if the drive
attempts to run at peak current for more then one second it will fold back the current to the
continuous current setting.
The peak current time is actually calculated on a curve using an I²/T method. For current
values that are less than the peak but greater than the continuous, the current foldback time
is calculated from the peak and continuous settings. As shown in the diagram below, current
values below the peak value can be used for longer periods of time.
Peak Current
Continuous Current
I²/T Calculation
AMPS
TIME
1 Sec.