Infanor SMT-BD1/m, Manual, Page: 55 / 58

55
SMT-BD1/m
Appendix
CAUTION
In
Fusing mode, the amplifier Rated current value must be adjusted in order to be lower or equal to the Maximum
authorized rated current of the amplifier ( see chapter 2, section 1 ).
Current limitation in
Limiting mode
When the amplifier RMS current (I
2
t) reaches 85 % of the Rated current , the Idyn signal output is activated and
the I
2
t error display is blinking on the amplifier front panel. When the RMS current (I
2
t) drops below 85 % of the
Rated current , the Idyn signal and the blinking I
2
t error display are both cancelled.
When the amplifier RMS current (I
2
t) reaches the Rated current value, the I
2
t protection limits the amplifier
current at this value.
The amplifier current limitation diagram in an extreme case (motor overload or locked shaft) is shown below:
t0 t1 t2
Rated current
Maximum current
Amplifier current
t1 = blinking display
t2 = current limitation
Time
The maximum current duration before the release of the Idyn signal output (t1 - t0) and before limitation at the
rated current (t2 - t0) is calculated the same way as for the
Fusing mode.
The I
2 t signal threshold values and the amplifier RMS current value on the digitizing oscilloscope, are also
calculated the same way as for the Fusing mode.
CAUTION
In
Limiting mode , the amplifier Rated current value must be adjusted in order to be lower or equal to the
Maximum authorized continuous current of the amplifier (see chapter 2, section 1 ).