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5 Basic Settings
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
5-12 Measures against Overvoltage
5
5-12-1 Overvoltage Suppression Function during Deceleration
• When the overvoltage suppression function during deceleration function is enabled, the actual
deceleration time is longer than the set time.
If the motor load inertia is considerably large, the motor may take a long time to stop.
To shorten the time until the motor stops, change to the deceleration stop method according to
5-12-2 Regenerative Braking Function on page 5-70.
•
Setting the Overvoltage Suppression Level During Deceleration (b131) to a value less than the
input power supply voltage prevents deceleration.
Be sure to set this to a value higher than the input power supply voltage multiplied by the square
root of 2.
Normally, do not set this value to 350 V or less for 200-V class and 700 V or less for 400-V class.
• Even when the overvoltage suppression function during deceleration function is enabled, rapid
deceleration may cause a trip error if the motor cannot respond in time.
In this case, change to the deceleration stop method according to 5-12-2 Regenerative
Braking Function on page 5-70.
(Example 1) When DC voltage is kept constant (b130 = 01)
(Example 2) When acceleration is enabled (b130 = 02)
Overvoltage
protection level
(b131)
Main circuit DC voltage [V]
Time [s]
Output frequency
[Hz]
Deceleration
started
Time [s]
DC voltage kept constant
Main circuit DC voltage [V]
Overvoltage
protection level
(b131)
Output frequency
[Hz]
Deceleration
started
Accelerates according to b132.
Time [s]
Time [s]
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