Configuration
7-11
48XX/49XXSHB0399
7.1.2.2 DC voltage tacho feedback
The actual speed value is fed back via X1/3 and X1/4. The tacho signal is
conditioned with a differential amplifier.
Stop!
Observe for tacho voltage adjustment, that also in field-weakening operation the
max. limit for the tacho input of 180 V must not be exceeded.
Possible configurations under C005:
-11- Speed control with tacho feedback
(Default setting)
-41- Torque control with speed limitation
For speed control with tacho feedback the analog actual value encoder must be
adjusted.
Adjustment of the tacho signal:
The analog inputs can be adjusted in respect of an offset or a gain fault. It is thus
possible to correct faults occuring in the controller or during transmission. The
value is adjusted to n
max
(C011).
n
set
adjustment (main set-value)
1. Inhibit controller via terminal X2/28.
2. Select max. set-value via X1/8.
3. Set C025 (”encoder selection”)to-4-.
4. Assign 100 % to the max. set-value under C029 (”automatic
adjustment”)(withs or t
(Adjustment of level tolerances in the set-value channel).
5. Acknowledge the adjustment with SH + PRG.
6. Set the speed set-value to approx. 50%.
n
act
adjustment
Stop!
The addition of the mains set-value and the additional set-value is limited to 180%
of n
max
! I.e. an addition of the additional set-value results in a motor speed of 1.8
¼ n
max
.
Observe max. motor speed and rated motor voltage!
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