Lenze 8600 series - Closed-Loop Speed Control; Analog Act. Value; Digital Act. Value

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4 Closed-loop speed control
For a number of applications, the accuracy which tan be obtained
with open-loop Speed control is often not sufficient. To avoid a
Speed reduction which occurs when an asynchronous motor is
loaded, you tan select a configuration with a Pl controller. The
appropriate configuration depends on the way of setpoint input and
the actual value input you want to use.
Closed-loop Speed control:
Code
f-
Parameter Meaning Acceptance
Setpoint 1 Setpoint 2 Actual value
CO05 -1 l- Terminals 7/8 (bipolar) or Terminals 1/2
Terminals 3/4 [SH + PRG]
LECOM (bipolar) or keypad (bipolar) analog act. value
(bipolar)
-13- Terminals 7/8 (bipolar) or Terminals 1/2 Input X5
LECOM (bipolar) or keypad (bipolar) Digital frequency (2-
1
(bipolar) track)
-14- l Input X8
Terminals 1/2 Input X5
Digital frequency (2-track)
(bipolar) Digital frequency (2-
track)
-15-’ Input X5 Terminals 1/2 Input X8
Digital frequency (2-track) (bipolar)
Pulse encoder (2-
track)
* According to the configuration selected, setpoint 1 or the act. value tan be
output via the digital frequency output XQ.
4.1 Analog act. value
If you use a DC tachogenerator, you should know the maximum
tacho voltage to be expected. You tan calculate this tacho voltage
from the ratings of the tacho and the maximum drive Speed.
Connect the tacho to input Xl/terminals 3, 4, and select the
Position of the switch SI, which is required for the maximum tacho
voltage (see page 31).
4.2 Digital act. value
If you use an incremental encoder for act. value, first select the
input for this encoder under code CO25. To enter the encoder
constant, two Steps are necessaty in general:
l Z;elect the closest value under C026.
l Compensate the differente under C027.
Encoder constant =
Pulses per revolution of the encodei
Pole pair number of the motor
Adjustment (C027) =
Constant (C026)
Encoder constant
Name
Parameter (Factory setting is printed in bold) Acceptance
Preselection:
-l- Analog input Xl/terminals 112 SH + PRG
Encoder -2- Analog input Xl/terminals 3/4
-4
Analog input Xl/terminal 8
-lO-
Digital frequency/incrementaI encoder
input X5
-ll-
Digital frequencyfincremental encoder
input X8
lenze
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