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Q EME-A22A: How to set 4-20mA for the analogue inputs?
A Please refer to Pr12.20 and Pr12.23 in the manual (Sensorless Vecotr Control
Compact Drive VFD-E Series user manual) to select 0-20mA or 4-20mA.
Q When Pr10-01=1, the PID set-point is via front potentiometer, but the manual
says via UP/DOWN keys, why?
A This is an error in the manual (Sensorless Vecotr Control Compact Drive VFD-E
Series user manual). When Pr10-01=1, PID set-point is acc. to Pr02-00, but in that
case only 1 (UP/DOWN keys) or 4 (front potentiometer) can be selected.
Q Register D1029 in the PLC shows wrong info
A This is an error in the manual (Sensorless Vecotr Control Compact Drive VFD-E
Series user manual). When ACI 4-20mA is selected, the range of 4-20mA corresponds
to 205-1023. 0-20mA corresponds to 0-1023.
Q How to read a PLC register via Modbus?
A It is not possible to read a PLC register directly via Modbus, but it can be done with
the following workaround. Assume your data are in Register D5. With instruction WPR
write the value of D5 to an unused parameter, e.g. Preset Speed 15 in Pr05-14. Then
read address 050D (the address of Pr05-14) by Modbus.
Q How to use and scale the analogue output AFM in the PLC program?
A The analogue output AFM can be used by putting the value in register D1040. The
range is 0-10V=0-65535.
The PLC cannot handle unsigned numbers >32767, therefore, first division by 2 and
then by 32767 is used. The loss of resolution is acceptable because the real AFM
resolution is 8 bits.
An example to output the output frequency on AFM, scaled to 0-10V=0-Fmax:
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