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Notes
Notes regarding special boundary conditions:
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
It is evident from the above example that the acceleration torque within
the lower speed range is approximately twice the value of the same value
at maximum speed. This results in optimally-timed positioning cycles. Of
course, the acceleration switchover is freely selectable in accordance
within certain technological criteria. In this case the result is the value of
the available motor torque M1 or M
In case your step drive features the "Current control through boost" func-
tion, you can count on the elevated curve for determining the acceleration
torque. Any advantage from increased acceleration capability is realized
from the torque curve only within the lower rpm range of the motor
(e.g. M
= 3.4 Nm – 0.6 Nm = 2.8 Nm, M
b1
The following adjustments should be made:
– electrical connection
– MD37 (activation of the function)
– MD48/49 (for monitoring of boost duration, see Section 7.3.9)
In case your step drive features the "Current control through PWM" func-
tion, you can reduce the power loss converted in the motor, thereby reduc-
ing motor heating. This is possible because the acceleration torque is not
needed. It is accomplished by reducing the motor current for idle and for
constant travel phases proportional to the load torque. An advantage of
reduced heating during constant travel becomes evident from the torque
curve, particularly within the lower rpm range of the motor.
The following adjustments should be made:
– electrical connection
– MD37 (activation of the function)
– MD50 = (M
(f
) : M
Load
max
– MD51 = (M
(f = 0): M
Load
Starting up the FM 453
according to the characteristic.
b1
unchanged).
b2
(f
)) 100%
(e.g. 60%)
Motor
max
(f = 0)) 100%
(e.g. 12%)
Motor
7-17
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