Lenze 8200 motec frequency inverter 0.25kW-7.5kW - Manual (Page 121)

Function library
Process controller, current limitation controller
7−50
L
EDB82MV752 EN 5.2
7.8 Process controller
7.8.1 Setting of control characteristics
Description
The process controller serves to put up control loops for controlling e.g. speed, pressure,
temperature, flow rate, humidity, level or dancer position.
The process controller requires a setpoint and an actual value (e.g. from a sensor). If setpoint and
actual value are selected as analog values (potentiometer, PLC), the controller must be equipped with
an application I/O to build up a control circuit.
Codes for parameter setting
Code Possible settings IMPORTANT
No. Name Lenze Selection
C0070 Process controller
gain 1.00 0.00
= P component not
active {0.01} 300.00 ^ 7−50
C0071 Process controller
readjustment time 100 10 {1} 9999
= I component not
active
^ 7−50
C0072 Differential
component of
process controller 0.0 0.0
= D component not
active {0.1} 5.0 ^ 7−50
C0074 Process controller
influence 0.0 0.0 {0.1 %} 100.0 ^ 7−50
C0238
v
Frequency
precontrol 2 0 No precontrol (only process controller) Process controller has full influence
^ 7−50
^ 7−53
1 Precontrol (total setpoint + process controller) Process controller has limited influence
2 No precontrol (only total setpoint) Process controller has no influence (not
active)
Total setpoint (PCTRL1−SET3) = Main
setpoint + additional setpoint
Adjustment
1. Roughly adjust the control features in the following tables based on the guide values.
2. Fine adjustment:
– Adjust C0070, C0071 and C0072 so that the target value is reached quickly and with
minimum overshoots in case of setpoint and actual value changes.
Scaling C0071
Value in C0071 Resulting reset time T
N
10 ... 5000 10 ms ... 5000 ms
5000 ... 6000 5 s ... 10 s
6000 ... 7000 10 s ... 100 s
7000 ... 8000 100 s ... 1000 s
8000 ... 9998 1000 s ... 9998 s