If the permissible value range is exceeded, this can be seen in status an33 REF norm
status or an36 AUX norm status with the display of 4 "data invalid". Then the converted
analog value is not written into the parameter.
The scaling must be adjusted accordingly in these cases.
Example 1: Speed setting in vl20 target velocity via analog input 1
A speed in the range of +/- 3000 rpm shall be written into parameter vl20 vl target velocity
with analog input 1.
The setting shall be done via the REF function, since only 1 input is required. Value 1
"AN1" is preset in an30 REF and AUX function under „ref input“ (Bit 0…3).
The REF signal shall write the vl target velocity. => an31 REF selector = 2314hex
A REF value of 100% → 4096 shall derive to a setpoint of 3000 rpm in vl20.
vl20 has a resolution of 1 rpm
=>
If the setting of vl20 shall be limited to +/-3000 rpm
, the AN1 limit values must be set to -
100% or +100% in an08 and an09.
If the value from the above example is increased by a factor of 100, a value of 100% for
REF results in a setpoint of 100 * 3000 rpm = 300000 rpm. 40% REF results in 0.4 *
300000 rpm = 120000 rpm. The upper limit of the setpoint is 128000 rpm. If the analog
value exceeds 42.67%, the upper limit of the parameter is exceeded by the scaling.
This is displayed in parameter an33 REF norm status, which changes from 0 "OK" to 4
"data invalid". The analog preset values are not accepted in this case.
Example 2: Additionally setting of the torque limit in cs12 absolute torque via ana-
log input 2
In addition to example 1, the torque limit cs12 absolute torque shall be preset via analog
input 2 in the range +/- 200%. Since the speed is already preset via REF, the torque limit
must be written via AUX.
Value 32 "AN2" is preset in an30 REF and AUX function under "A input“ (Bit 4…7). In ad-
dition, "aux function" (bits 12 ... 15) must be set to 4096: A.
The AUX signal shall write cs12 absolute torque.
=> an34 AUX selector = 270C hex
A REF value of 100% → 4096 shall derive to a setpoint of 200.0% in cs12.
cs12 has a resolution of 0.1%
=>
PID process controller
To use the system it is often necessary to equip the drive controller with an internal pro-
cess controller. This can be used to built up pressure or temperature controls, for exam-
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