(Example 1)
When DC voltage is kept constant (b130 = 01)
Main circuit DC voltage [V]
Overvoltage
suppression
level (b131)
(Example 2)
When acceleration is enabled (b130 = 02)
Main circuit DC voltage [V]
Overvoltage
control level
(b131)
Output frequency
[Hz]
DC
voltage
kept
constant
Time [s]
Output frequency
[Hz]
Time [s]
Deceleration starts Deceleration starts
starts
Accelerates
according
to
b132
Time [s]
Time [s]
Precautions for Correct Use
•
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 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 5-64.
•
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 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 5-64.
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