Protective Functions; Input Power Supply Phase Loss Protection; Output Phase Loss Protection Function - Omron RX2 Series User Manual

8-3

Protective Functions

8-3-1

Input Power Supply Phase Loss Protection

Enable the input phase loss protection function by using [bb-65] Input phase loss protection selection.
When the input phase loss protection function has been enabled, an input phase loss error [E024] will
occur if a phase loss state due to disconnection or breakage of the input power cable continues for 1
second or more.
If an input phase loss error [E024] occurs, it is necessary to cut off the power supply to the inverter and
check the state of wiring and breakers.
Precautions for Correct Use
• When 3-phase AC is not input to power supply terminals R, S, and T, such as in cases where
DC voltage is input to R and T or between P and N of the inverter, this function is disabled
regardless of the setting for [bb-65].
• There will be no detection during an instantaneous power failure.
 Parameter
Item
Input phase loss
enable
8-3-2

Output Phase Loss Protection Function

Enable the output phase loss protection function by using [bb-66] Output phase loss protection
selection.
When the output phase loss protection function has been enabled, an output phase loss error [E034]
will occur if a phase loss caused by disconnection or breakage of the motor cable continues.
Precautions for Correct Use
• If the capacity of the drive motor is smaller than that of the inverter, the inverter may errone-
ously detect an output phase loss. In this case, decrease the value of [bb-67] or set [bb-66] to
00.
• If the carrier frequency [bb101] is low, the inverter may erroneously detect an output phase
loss. It may improve by increasing the value of the carrier frequency [bb101].
• This function operates when the output speed is between 5 Hz and 100 Hz.
• Set the value of [bb-67] equal to or lower than the steadily flowing current, with the rated cur-
rent being 100%.
• A phase loss will lead to the followings, which may result in an inverter malfunction:
• The ripple current in the main capacitor will increase, which remarkably reduces the life
expectancy of the inverter.
• Under a load condition, the inverter's internal converter may be damaged.
High-function General-purpose Inverter RX2 Series User's Manual
Parameter Data
00
[bb-65]
01
8 Applied Settings
Description
Disabled
Enabled
Default
data
00
8
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