6
BCN-C22005-957
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)
• The input signals are as follows.
*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.
NOTE
• During electronic bypass operation while the electronic bypass sequence is enabled (
Pr.135
= "1"), the emergency
drive function is not available.
Magnetic
contactor
Installation location
Operation
During commercial power
supply operation
During inverter operation
MC2
Between power supply and motor
Shorted
Open
MC3
Between inverter output side and motor
Open
Shorted
Signal
Function
Operation
MC operation
*4
MC2
MC3
CS
*1
Inverter/bypass
ON: Inverter operation
×
○
OFF: Emergency drive commercial power
supply operation
*2
○
×
X84
Emergency drive operation
ON: Emergency drive operation
—
—
OFF: Normal operation
*3
×
○
RES
Operation status reset
ON: Reset
×
No change
OFF: Normal operation
—
—
Notation
MC operation
○
ON
×
OFF
—
During inverter operation: MC2-OFF, MC3-ON
During commercial power supply operation: MC2-ON, MC3-OFF
No change
The operation status before changing the signal state to ON or OFF is held.
BCN-C22005-957_ENG.fm 6 ページ ２０２１年４月２７日 火曜日 午後４時２０分
Downloaded from