Omron RX2 Series User Manual page 465

Instantaneous Power Failure Non-stop Deceleration/Stop
([bA-30] = 01)
This function allows deceleration and stop of the motor while maintaining the voltage under the instan-
taneous power failure non-stop frequency constant voltage level [bA-32] after the power supply was
shut down during operation.
If the power supply was shut down during operation, deceleration starts at the frequency lowered by
deceleration starting width [bA-36] when the voltage drops to the instantaneous power failure non-stop
function activating voltage [bA-31] or lower, and then decelerates for the instantaneous power failure
non-stop deceleration time [bA-34].
In case of regenerative status caused by deceleration torque during deceleration and if the internal
power supply voltage reaches the frequency-constant voltage level [bA-32] or higher, the motor will be
at constant speed until the internal power supply voltage falls below the overfrequency-constant voltage
level [bA-32].
Precautions for Correct Use
• If the frequency-constant voltage level [bA-32] < Function starting voltage [bA-31], it works by
taking [bA-32] at the same level as [bA-31]. However, the set values will not be changed.
• If the frequency-constant voltage level [bA-32] is lower than the input voltage multiplied by
√2, the constant speed state will be maintained and deceleration will not take place if the
power recovers while this function is in operation. Power should be shut off and turned on
again, or [bA-32] needs to be reset during operation. The [bA-32] must be set to a value
greater than the input voltage multiplied by √2.
• This function will not be disabled until the operation stop will be completed. To recover power
and restart the operation while this function is in operation, input the stop command (opera-
tion command OFF) and then input the operation command again after the motor stopped.
• If the instantaneous power failure non-stop deceleration starting range [bA-34] is too large,
sudden deceleration will cause overcurrent tripping. • If the value of [bA-36] is too low or the
instantaneous power failure non-stop deceleration time [bA-34] is too long, insufficient regen-
erative force will cause undervoltage tripping.
Main Circuit DC PS
Voltage (V)
Undervoltage Level
Output Frequency
(Hz)
[IPS] Signal
High-function General-purpose Inverter RX2 Series User's Manual
[bA-32]
[bA-31]
[bA-36]
[bA-34]
Time (sec)
Time (sec)
ON
Time (sec)
8 Applied Settings
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