Omron 3G3RX - Overvoltage Protection; Controlled Stop at Power Loss

RX Quick Start Guide
34 RX Quick Start Guide
3.22 Overvoltage protection
DC Bus AVR (Automatic Voltage regulation) helps to avoid an overvoltage
trip when the DC bus voltage increase due regeneration during decelera-
tion. The function keeps the DC bus voltage stable at certain level regulating
the deceleration ramp by a PI function. Please that the actual deceleration
time can be longer in this case.
3.23 Controlled stop at power loss
This function is intended to achieve a controlled stop and avoid free-running of the motor when power is lost during run mode.
Inverter controls the internal DC bus voltage while decelerating the motor using the regenerative energy to keep the DC bus at a
level that allows to reduce the motor speed and avoid a long coasting time. Next diagram shows how the function works
Parameter Parameter name Description
b021 Overload limit selection 00: OFF (Disabled)
01: ON-Acc/Cnst (Enabled in acceleration/constant speed operation)
02: ON-Cnst (Enabled in constant speed operation)
03: ON-A/C(R) (Enabled in acceleration/constant speed operation (Accelerates during
regeneration))
b022 Overload limit level 0.20 x Rated current to 2.00 x Rated current (0.4 to 55 kW)
0.20 x Rated current to 1.80 x Rated current (75 to 132 kW)
b023 Overload limit parameter 0.10 to 30.00 s
b024 Overload limit selection 2 00: OFF (Disabled)
01: ON-Acc/Cnst (Enabled in acceleration/constant speed operation)
02: ON-Cnst (Enabled in constant speed operation)
03: ON-A/C(R) (Enabled in acceleration/constant speed operation (Accelerates during
regeneration))
b025 Overload limit level 2 0.20 x Rated current to 2.00 x Rated current (0.4 to 55 kW)
0.20 x Rated current to 1.80 x Rated current (75 to 132 kW)
b026 Overload limit parameter 2 0.10 to 30.00 s
b027 Overcurrent suppression function 00: OFF (Disabled)
01: ON (Enabled)
Parameter Parameter name Description
b130 Overvoltage protection function
selection during deceleration
00: OFF (Disabled)
01: V-const (DC voltage kept constant)
02: Accel (Acceleration enabled)
b131 Overvoltage protection level
during deceleration
200-V class: 330 to 390
400-V class: 660 to 780
b132 Overvoltage protection
parameter
0.10 to 30.00 s
b133 Overvoltage protection
proportional gain setting
0.00 to 2.55
b134 Overvoltage protection integral
time setting
0.000 to 65.535 s
Threshold voltage to start DC bus AVR (B131)
DC bus AVR
t
t
DC bus voltage
Freq
Normal
operation
b130 = 01
Power
DC bus voltage
Output frequency
b052
b051
Under-voltage
level
OFF
b054
b053
b053
b053