Lenze 8200 motec frequency inverter 0.25kW-7.5kW - Manual (Page 109)

Function library
Configuration of analog and digital setpoints and actual values
7−38
L
EDB82MV752 EN 5.2
Example: Calibration when using a process controller
Example for pressure control
If, for instance, the control range of a pressure control is to be limited to a value lower than the rated
sensor value P
r
, the effective pressure setpoint can be proportionally reduced through the gain of
the analog input (C0027, C0414):
·
Actual pressure value via pressure sensor (P
r
= 0 − 200 mbar) at X3/2U (C0412/5 = 4).
·
Analog pressure setpoint via X3/1U (C0412/4 = 1).
·
The maximum pressure is to be limited to 120 mbar. Reduce the effective pressure setpoint via
the gain of the analog input:
C0414 ń1 +
P
1
P
N
@ 100 % + 120 mbar
200 mbar
@ 100 % + 60 %
Gain calculation
Gain [%] +
f (P
2
) * f (P
1
)
U (P
2
) * U (P
1
)
@ 100 % + * 30 % * 100 %
100 % * 20 % @
100% + * 162.5 %
Offset calculation
Offset (P
2
) [%] +
f (P
2
) [%]
Verstärkung [%]
@ 100 % * U (P
2
) [%] + * 30 %
* 162.5 % @
100 % * 100 % + * 81.5 %
Example: Calibration when using a process controller
Example for pressure control
The control range of a pressure control is to be limited to a value lower than the rated sensor value
P
N
. For this purpose, the effective pressure setpoint can be proportionally reduced through the gain
of the analog input (C0027, C0414):
·
Actual pressure value via pressure sensor (P
N
= 0 − 200 mbar) at X3/2U (C0412/5 = 4).
·
Analog pressure setpoint via X3/1U (C0412/4 = 1).
·
The maximum pressure is to be limited to 120 mbar. Reduce the effective pressure setpoint via
the gain of the analog input.
C0414 ń1 +
P
1
P
N
@ 100 % + 120 mbar
200 mbar
@ 100 % + 60 %