Mitsubishi Electric FR-F800 Series Instruction Manual page 285

 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 or Advanced magnetic flux vector control (Under PM motor control, the operation is not switched over
to the commercial power supply operation and 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
MC3
• The input signals are as shown below.
Signal
*1
CS
X84
RES
*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 shown below.
Notation
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NOTE
• During electronic bypass operation while the electronic bypass sequence is enabled (Pr.135 = "1"), the emergency drive
function is not available.
284
5. PARAMETERS
5.7 (H) Protective function parameter
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Installation location
Between power supply and motor
Between inverter output side and motor Open
Function
Inverter/bypass
Emergency drive operation
Operation status reset
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.
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During commercial power supply
operation
Shorted
Operation
ON: Inverter operation
OFF: Emergency drive commercial power
*2
supply operation
ON: Emergency drive operation
*3
OFF: Normal operation
ON: Reset
OFF: Normal operation
MC operation
Operation
During inverter operation
Open
Shorted
*4
MC operation
MC2 MC3
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