Omron 3G3RX - Overvoltage Protection Function During Deceleration

4-78
4-2 Function Mode
4
Functions
Overvoltage Protection Function During Deceleration
•This function helps avoid an overvoltage trip due to regenerative energy from the motor during
deceleration.
•You can set whether to enable or disable this function with overvoltage protection function
selection during deceleration b130.
•If overvoltage protection function selection b130 is set to "01" (enabled: DC voltage constant
control), the Inverter automatically decelerates while keeping the main circuit DC voltage rise due
to deceleration start at the overvoltage protection function level setting (b131).
•If overvoltage protection function selection b130 is set to "02" (enabled: with acceleration), the
main circuit DC voltage increases because of deceleration start. When the main circuit DC voltage
exceeds the overvoltage protection function level setting (b131), the Inverter starts acceleration
according to the setting of overvoltage protection parameter b132. After that, when the main circuit
DC voltage falls below the b131 level, the Inverter starts deceleration again.
Note 1: With this function enabled, the actual deceleration time may be longer than the set value.
Particularly with b130 = 02, if b131 is set too low, the Inverter may not decelerate.
Note 2: Even if this function is enabled, an overvoltage trip may occur depending on the deceleration rate and
load condition.
Note 3: When using this function, the Inverter may reduce frequency depending on the moment of inertia of motor
load, and takes a long time to stop.
Parameter No. Function name Data Default setting Unit
b130
Overvoltage protection
function selection
during deceleration
00: OFF (Disabled)
01: V-const (DC voltage kept constant)
(example 1) *
2
02: Accel (Acceleration enabled) (example 2)
01 
b131
Overvoltage protection
level during
deceleration *
1
200-V class: 330 to 390
400-V class: 660 to 780
380/760 V
b132
Overvoltage protection
parameter
0.10 to 30.00:
Set the acceleration rate applied when this
function is enabled.
1.00 s
b133
Overvoltage protection
proportional gain setting
0.00 to 2.55:
Proportional gain for DC voltage constant
control (b130 = 01 only)
0.50 
b134
Overvoltage protection
integral time setting
0.000 to 65.535:
Integral time for DC voltage constant control
(b130 = 01 only)
0.060 s
(Example 1) When b130 = 01 (Example 2) When b130 = 02
Overvoltage
protection level
(b131)
Main circuit DC voltage (V)
Time (s)
Output frequency (Hz)
Deceleration
started
Time (s)
DC voltage kept constant
Overvoltage
protection level
(b131)
Main circuit DC voltage (V)
Time (s)
Output frequency (Hz)
Deceleration
started
Time (s)
Accelerates according to b132.