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Starting up the FM 453
Drive Transition
For the following position-controller optimization, it is important to know the
Time and Maxi-
drive time constant (transition time). In open-loop control mode and on errors
mum Voltage Rise
with the response "Everything Off" (see Section 11) the voltage value is fed
to the drive by way of a ramp defined in MD45. A variety of drives, as well
as certain mechanical or technological situations, may require a limitation on
the voltage rise. If you do not have a specific value in hand and wish to find a
suitable rise value by trial and error, please use the following procedure:
Note
A voltage rise setting will obviously make the axis stop more slowly if an
"Everything Off" error response occurs.
Select
Mode = Control
Voltage level 2
Set
Voltage level 1 = 0
Voltage level 2 = U
Set
Servo enable = ON
Start axis
Plus or minus direction
(be sure there is enough room!)
Read drive time constant (Ta) from
servicing data
Axis acceleration too high?
No
Axis acceleration too low?
No
Was voltage level 2 = U
Yes
END
Fig. 7-9
Drive Transition Time and Maximum Voltage Rise
7-22
= U
a
max
If controlled drive of the axis at U
without a voltage ramp, set voltage level 2 to a value
U
< U
a
max
Ta
from the measured time constant Ta, as:
real
Yes
Parameterization
MD45 – Voltage ramp lower
Set
Activate machine data
Yes
Parameterization
MD45 – Voltage ramp higher
Set
Activate machine data
?
max
No
Set
Raise voltage level 2
(up to U
= U
)
a
max
is not possible
max
and calculate the real drive time constant
Ta
= Ta U
: U
real
max
a
Start axis
Plus or minus direction
(be sure there is enough room!)
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
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