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8 Applied Settings
High-function General-purpose Inverter RX2 Series User’s Manual
8-2 Tripless Functions
8
8-2-3 Overvoltage Suppression Function During Deceleration
When [bA140] is 01, PI control is performed so that the internal DC voltage will be constant.
Setting the proportional gain [bA144] to be large will accelerate the response. However, setting it to be
too large will dissipate the control, tending to cause tripping.
Setting the integral gain [bA145] to be short will accelerate the response. However, setting it to be too
short will tend to cause tripping.
If the internal DC voltage increases when [bA140] is 02 or 03, acceleration control is performed.
The acceleration control accelerates to the highest frequency setting according to the overvoltage sup-
pression operating time [bA142]. After the acceleration, it decelerates to the target value according to
the normal deceleration time.
Precautions for Correct Use
If the overvoltage suppression operating time [bA142] is set to be too short, it accelerates more
than decelerating and may prevent the motor from stopping. In this case, increase the setting of
the overvoltage suppression level setting [bA141].
For Constant DC Voltage Control [bA140] = 01
Main Circuit DC Voltage (V)
OvervoltageSup-
pression Level
[bA141]
Output
Frequency (Hz)
Constant DC
Voltage Control
Actual
Deceleration Time
Time
Set Deceleration Time
Deceleration
Starts
Time
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