Lenze 4800 Manual page 102

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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-
-41-
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
n
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
5. Acknowledge the adjustment with SH + PRG.
6. Set the speed set-value to approx. 50%.
n
Stop!
The addition of the mains set-value and the additional set-value is limited to 180%
of n
¼ n
Observe max. motor speed and rated motor voltage!
Speed control with tacho feedback
(Default setting)
Torque control with speed limitation
(C011).
max
adjustment (main set-value)
set
adjustment") (with s or t 
(Adjustment of level tolerances in the set-value channel).
adjustment
act
! I.e. an addition of the additional set-value results in a motor speed of 1.8
max
.
max
Configuration
48XX/49XXSHB0399
7-11