Mitsubishi Electric 800 Series Instruction Manual page 251

 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 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.) V/
F control or Advanced magnetic flux vector control (Under PM motor 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.
• For the terminals used for the MC2 and MC3 signal output, set "18 (positive logic)" and "19 (positive logic)" in any two of
Pr.190 to Pr.196 (Output terminal function selection) to assign the function.
• Operation of magnetic contactor (MC2, MC3)
Magnetic contactor
MC2
MC3
• The input signals are as shown below.
Signal
CS Inverter/bypass
X84 Emergency drive execution
RES Operation status reset
*1 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.
*2 If the signal is turned OFF during the emergency drive operation, the operation will not be returned to normal.
*3 MC operation is as shown below.
Notation
○ 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.
NOTE
• During electronic bypass operation while the electronic bypass sequence is enabled (Pr.135 = "1"), the emergency drive
function is not available.
250
5. PARAMETERS
5.7 (H) Protective function parameter
Installation location
Between power supply and motor
Between inverter output and motor
Function
ON Inverter operation
OFF Emergency drive commercial power
supply operation
ON Emergency drive execution
OFF Normal operation
ON Reset
OFF Normal operation
MC operation
Operation
During commercial power
supply operation
Shorted
Open
Operation
*1
*2
During inverter operation
Open
Shorted
*3
MC operation
MC2 MC3
 
 
— —
 

Invariance
— —