Programming
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D-74
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
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MOT PMAC PROTECT
SETUP::MOTOR CONTROL::MOT PMAC PROTECT
Designed for PMAC Control Mode.
This is a motor protection based on the rms current flowing in the motor phases. This protection is called
I2T and is based on the permanent current and thermal time constant.
The 100% permanent current is the following curve extracted from parameters in MOTOR PMAC 1 and 2
function block:
The rms motor current is filtered with a first order low pass filter based on the THERMAL TIME CST. The
output I2T MOTOR LOAD of this filter is a percentage of the motor thermal load. When this output
exceeds 100%, the drive trips in I2T MOTOR TRIP. The level of motor load (I2T MOTOR LOAD) is given
as a percentage (100% represents a current equal to the PERM CURRRENT flowing in the motor phases for
a THERMAL TIME CST time).
