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Electronic bypass during emergency drive (Pr.136, Pr.139, Pr.57)
• For selecting the commercial mode (Pr.523 = "3[][], 4[][]"), setting is required as follows.
Set Pr.136 MC switchover interlock time and Pr.139 Automatic switchover frequency from inverter to
bypass operation and assign MC2 and MC3 signals to output terminals.
When the CS signal is assigned to an input terminal, set Pr.57 Restart coasting time ≠ "9999" and input the CS
signal through the terminal. (In the initial setting, the CS signal is assigned to the terminal CS.)
Select V/F control, Advanced magnetic flux vector control, or Real sensorless vector control. (Under PM
sensorless vector control, the operation is not switched over to the commercial power supply operation the output
is shut off.)
• During emergency drive operation, the operation is switched over to the commercial power supply operation
when any of the following conditions is satisfied.
CS signal turns OFF.
A critical fault for which retry is not permitted occurs while Pr.523 = "3[][]".
A critical fault occurs while Pr.523 = "4[][]".
• While the motor is driven by the inverter during emergency drive operation, if a condition for electronic bypass is
satisfied, the output frequency is accelerated/decelerated to the Pr.139 setting. When the frequency reaches the
set frequency, the operation is switched over to the commercial power supply operation. (The operation is
immediately switched over to the commercial power supply operation during output shutoff due to a critical fault
occurrence.)
• If the parameter for electronic bypass is not set while the commercial mode is set (Pr.523 = "3[][], 4[][]"), the
operation is not switched over to the commercial power supply operation even when a condition for switchover is
satisfied, and the output is shut off.
• To assign the MC2 and MC3 signals to output terminals, use any two of Pr.190 to Pr.196 (Output terminal
function selection) and set "18 (positive logic)" for the MC2 signal and set "19 (positive logic)" for the MC3
signal.
• Operation of magnetic contactor (MC2, MC3)
Magnetic
contactor
MC2
Between power supply and motor
MC3
Between inverter output side and motor
• The input signals are as follows.
Signal
*1
Inverter/bypass
CS
X84
Emergency drive operation
RES
Operation status reset
*1
Input the CS signal via an external terminal. (Set Pr.162 = "0 to 3, 10 to 13" or Pr.338 = "1".)
*2
If the signal is turned ON after switchover to the emergency drive commercial power supply operation, the operation will not be
returned to the inverter-driven operation.
*3
If the signal is turned OFF during the emergency drive operation, the operation will not be returned to normal.
*4
MC operation is as follows.
Notation
○
×
—
No change
NOTE
• During electronic bypass operation while the electronic bypass sequence is enabled (Pr.135 = "1"), the emergency
drive function is not available.
Installation location
Function
ON: Inverter operation
OFF: Emergency drive commercial power
supply operation
ON: Emergency drive operation
OFF: Normal operation
ON: Reset
OFF: Normal operation
ON
OFF
During inverter operation: MC2-OFF, MC3-ON
During commercial power supply operation: MC2-ON, MC3-OFF
The operation status before changing the signal state to ON or OFF is held.
During commercial power
supply operation
Shorted
Open
Operation
*2
*3
MC operation
6
Operation
During inverter operation
Open
Shorted
MC operation
MC2
×
○
○
×
—
—
×
○
×
No change
—
—
BCN-C22005-957
*4
MC3
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