Overvoltage Protection Function During Deceleration - Omron 3G3RX User Manual

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.
Parameter No. Function name
Overvoltage protection
b130 function selection
during deceleration
Overvoltage protection
b131 level during
deceleration *
Overvoltage protection
b132
parameter
Overvoltage protection
b133
proportional gain setting
Overvoltage protection
b134
integral time setting
(Example 1) When b130 = 01
Main circuit DC voltage (V)
Overvoltage
protection level
(b131)
Output frequency (Hz)
DC voltage kept constant
Deceleration
started
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.
Data
00: OFF (Disabled)
01: V-const (DC voltage kept constant)
2
(example 1) *
02: Accel (Acceleration enabled) (example 2)
200-V class: 330 to 390
400-V class: 660 to 780
1
0.10 to 30.00:
Set the acceleration rate applied when this
function is enabled.
0.00 to 2.55:
Proportional gain for DC voltage constant
control (b130 = 01 only)
0.000 to 65.535:
Integral time for DC voltage constant control
(b130 = 01 only)
(Example 2) When b130 = 02
Main circuit DC voltage (V)
Overvoltage
protection level
(b131)
Time (s)
Output frequency (Hz)
Time (s)
4-2 Function Mode
Default setting
01
380/760
1.00
0.50
0.060
Deceleration
started
Accelerates according to b132.
4
Unit

V
s

s
Time (s)
Time (s)
4-78