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Description of Functions
Effect: PWM
The motor phase current can be changed between 0 % and 100 %. Current
modification is possible at zero speed and during continuous travel. On accel-
eration/deceleration, the current is always 100 % (max).
f
I
100 %
MD50
MD51
Effect: Boost
During acceleration/deceleration, the activated boost signal triggers a current
increase on the drive unit. The amount of the increase is set on the drive unit.
At zero speed and during continuous travel, the current is always 100 %.
I
100 %
Zero pulse generation
To support stepper motor axis synchronization, the FM 453 processes a cyclic
input signal (which is dependent on the axis movement) as a zero marker (see
Section 4.6). This signal can be either the "Current-sourcing pattern zero"
signal from the step drive, or a "Zero pulse external" signal (e.g. initiator)
generated once per stepper motor revolution. The signal is connected via the
"NL" input. The active level of the signal can be parameterized.
9-90
pulse
PWM
PWM
f
pulse
Boost
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
t
t
t
t
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