Output Power Compensation Function - Toshiba TOSVERT VF-AS3 Instruction Manual

4. 3. 7

Output power compensation function

■ Function
The output power compensation function can be used with PID control.
In case the PID set value is set with analog input etc., the target value may decrease due to aged deterioration
of the analog input part etc. in some cases. In this case, despite the PID control being performed normally, the
output power of the load will be reduced and the desired output will not be obtained.
By using the output power compensation function, the output power can be detected whether it is below than
the desired value, and compensated the target value, therefore it is possible to prevent the reduction of the load
power,
The block diagram of the output power compensation, and the parameters are shown below.
PID set value
PID feedback
Title
A338
A339
■ Caution
• When using the 1st PID and setting [A338] ≠ "0.00", the output power compensation function is enabled.
• "When [A339: Output power target value] <output power", output power compensation is not performed.
• The output power is calculated by the inverter.
• Do not use the output power compensation function with continuous regeneration application.
• Output power compensation function is invalid for PID control 2 and external PID.
VF-AS3
Gain: [A338]
P-control
Max value
+
selection
-
Parameter name
Output power
compensation P gain
Output power set value
4-15
Output power compensation block
+
[A339]
-
Output power
0
PID
control
function
The gain which translate output power deviation to the
compensation value of PID set value.
Set low limited value of load output power.
E6582112
4. Setting for PID control
3
4
9