Overvoltage Control Function During Deceleration; Am Adjustment - Omron 3G3JX User Manual

4-2 Function Mode

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.
Parameter No.
b055
4
b056
b133
b134
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.
b080
C028
C086
4-35
Function name
Overvoltage protection
proportional gain during
deceleration
Overvoltage protection integral
time during deceleration
Overvoltage protection function
selection during deceleration
Overvoltage protection level
setting during deceleration
Internal DC
voltage
Output
frequency
Normal
Function name
AM adjustment 0. to 255.
00: Output frequency
AM selection
01: Output current
AM offset adjustment 0.0 to 10.0
Data
0.2 to 5.0
0.0 to 150.0
00: Disabled
01: Enabled
200-V class: 330 to 395
400-V class: 660 to 790
Set level (B134)
t
t
Overvoltage protection during deceleration
Data
Default setting Unit
⎯
0.2
0.2 s
⎯
00
380/
V
760
Default setting Unit
⎯
100
⎯
00
0.0 V