Restart During Power Interruption/Undervoltage - Omron RX2 Series User Manual

8 Applied Settings
8-2-6

Restart during Power Interruption/Undervoltage

Restart Undervoltage
You can select either tripping ([bb-21] = 00) with power supply recovery or retrying restarting
([bb-21] ≠ 00) when the main power (R, S, T) fails.
If the input power supply to the inverter is input separately to main power supply (R, S, T) and con-
trol power supply (R0, T0), the operation depends on how the power to the main power supply (R, S,
T) drops.
When [bb-27] = 00, you can avoid undervoltage error if the main power supply is to be turned off for
saving energy while the inverter output is being stopped.
When [bb-27] = 02, you can avoid undervoltage error caused by power shutdown during decelera-
tion and stop.
When the Power Interruption/Undervoltage Restart Selection (bb-24) is set to one of the restart
options, the inverter repeats restart operation for the number of times set in the Power Interruption
Restart Count (bb-20) in the event of a power interruption, or for the number of times set in the
Undervoltage Restart Count (bb-21) in the event of an undervoltage, and then trips.
When bb-20 or bb-21 is set to No limit, the inverter does not trip.
The Power Interruption/Undervoltage Restart Selection (bb-24) is set to restart condition according
to your system.
You can select 0-Hz restart/Frequency matching restart/Frequency pull-in restart/Detection speed
(Frequency)/Trip after frequency matching deceleration stop.
Precautions for Correct Use
• If the input power supply to the inverter is input to the control power supply (R0, T0) via main
power supply (R, S, T), instantaneous power failure tripping or instantaneous power failure
retry may be triggered first depending on the operating situation.
• If the control power supply has failed completely, the action to be taken is the powering on.
• After 40 seconds with the main power supply (R, S, T) failed, the undervoltage will occur and
the motor will trip even if [bb-27] = 00 or 02.
• Inverter internal P-N voltage can be monitored with [dA-40].
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High-function General-purpose Inverter RX2 Series User's Manual