4-35
4-2 Function Mode
4
Functions
Overvoltage Control Function During Deceleration
This function helps avoid an overvoltage trip during deceleration. Note that the actual deceleration
time may be longer than the set value. This function automatically keeps DC voltage at the set level
during deceleration. The aim of this function is the same as the overvoltage LAD stop function, de-
scribed in b130 and b131. However, these functions have different deceleration characteristics and
you can select either function according to your system.
With this function activated, PI control works to keep the internal DC voltage constant.
•Though quicker response is expected with a larger proportional gain, control tends to be divergent
and may easily lead to a trip.
•Response also becomes quicker with a shorter integral time, but if too short, it may lead to a trip as
well.
AM Adjustment
You can adjust the calibration of the analog voltage (0 to 10 V DC) from the AM terminal on the con-
trol terminal block by using the Inverter setting.
Parameter No. Function name Data Default setting Unit
b055
Overvoltage protection
proportional gain during
deceleration
0.2 to 5.0 0.2 ⎯
b056
Overvoltage protection integral
time during deceleration
0.0 to 150.0 0.2 s
b133
Overvoltage protection function
selection during deceleration
00: Disabled
01: Enabled
00 ⎯
b134
Overvoltage protection level
setting during deceleration
200-V class: 330 to 395
400-V class: 660 to 790
380/
760
V
t
t
Internal DC
voltage
Output
frequency
Set level (B134)
Normal Overvoltage protection during deceleration
Parameter No. Function name Data Default setting Unit
b080 AM adjustment 0. to 255. 100 ⎯
C028 AM selection
00: Output frequency
01: Output current
00 ⎯
C086 AM offset adjustment 0.0 to 10.0 0.0 V
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