Lenze 8200 Frequency inverters - Manual (Page 121)

Commissioning
8200SHB0199 5-16
5.4.3 Operation with PID controller
The following controls can be implemented with the internal PID controller:
-
pressure,
-
temperature,
-
flow rate,
-
speed,
-
dancer-position controls.
Functions
Configuration Set C005 = -6- or -7- for controlled operation with a PID controller
Variables - C070 = gain
- C071 = integral action time
- C072 = differential component
- The I component of the controller can be reset when reaching the Q
min
threshold (C017), to
suppress the initial conditions because of the missing actual value.
Influence and setpoint
precontrol - Set the PID controller influence under C074.
- Select whether setpoint precontrol is to be used under C238.
- The setpoint precontrol is advantageous for applications which provide an actual value signal
which is directly proportional to the speed of the drive. The influence of the PID controller can
then be limited that only the maximum expectable slip of the machine will be controlled.
- For application where the PID controller is used as process controller, the settings C238 = -0-
(without setpoint precontrol) and C074 = 100 % are required.
Setpoint input - Enter a fixed setpoint under C181:
- For instance, for dancer position control to select the dancer position.
Via terminal 8 or terminal E1. - The setpoint can be selected either via terminal 8 or terminal E1. The terminal not used for
setpoint selection is used for the feedback.
- With the analog plug-in module 8279IB terminal E1 is used as 2nd analog input
(0 ... 10 V / 0/4 ... 20 mA).
- Without the analog plug-in module 8279IB terminal E1 can be used as digital input (pulse
frequency 0 kHz ... 10 kHz, LOW level = 0 V ... 3 V, HIGH level = 12 V ... 30 V).
Adjustment The adjustment of the analog inputs limits the control range.
- C026 and C027:
- Adjustment terminal 8.
- C426 and C427:
- Adapt C426 and C427 if a 4 ... 20 mA signal is assigned via terminal E1 (8279IB).
Actual value C051 indicates the actual value of the PID controller.
Show/Hide Bookmarks