5 Basic Settings
5 - 68
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
5-12 Measures against Overvoltage
• Use this function to prevent overvoltage trip caused by the regenerative energy from the motor during
deceleration.
• Enable or disable the function in the Overvoltage Suppression Function Selection During
Deceleration (b130).
• If the Overvoltage Suppression Function Selection During Deceleration (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 Suppression Level During Deceleration
(b131).
• If the Overvoltage Suppression Function Selection During Deceleration (b130) is set to 02 (Enabled:
acceleration enabled), the inverter starts accelerating according to the Overvoltage Suppression
Parameter During Deceleration (b132) setting when the main circuit DC voltage increases due to the
start of deceleration to exceed the Overvoltage Suppression Level During Deceleration (b131). After
that, when the main circuit DC voltage falls below the value set in b131, the inverter starts
deceleration again.
• To use this function, set the Usage Rate of Regenerative Braking (b090) and the Regenerative
Braking Selection (b095) to 0.0 (Disabled).
*1 When b130 is set to 01, PI control works to keep the internal DC voltage constant.
Although increasing the Overvoltage Suppression Proportional Gain During Deceleration (b133) provides a
faster response, setting it to an excessive large value may cause an overcurrent trip.
Increasing the Overvoltage Suppression Integral Time During Deceleration (b134) also provides a faster
response, but setting it to an excessive small value may cause an overcurrent trip.
*2 If b131 is set to a value less than the input voltage, the inverter may not be able to stop the motor. Normally, do
not set this value to 350 V or less for 200-V class and 700 V or less for 400-V class.
*3 The default data was changed from the previous model.
5-12-1 Overvoltage Suppression Function during Deceleration
Parameter
No.
Function name Data Default data Unit
b130
Overvoltage Suppression
Function Selection During
Deceleration
00: Disabled
01: Enabled (DC voltage kept
constant) (Example 1)
*1
02: Enabled (Acceleration enabled)
(Example 2)
01
*3
–
b131
Overvoltage Suppression
Level During Deceleration
*2
200-V class: 330 to 390
400-V class: 660 to 780
380/760 V
b132
Overvoltage Suppression
Parameter During
Deceleration
0.10 to 30.00:
Set the acceleration rate applied when
this function is enabled.
1.00 s
b133
Overvoltage Suppression
Proportional Gain During
Deceleration
0.00 to 2.55:
Proportional gain for DC voltage
constant control (b130 = 01 only)
0.50 –
b134
Overvoltage Suppression
Integral Time During
Deceleration
0.000 to 9.999/10.00 to 65.53:
Integral time when DC voltage is kept
constant (b130 = 01 only)
0.060 s
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