Electronic Bypass During Emergency Drive (Pr.136, Pr.139, Pr.57) - Mitsubishi Electric FR-F800 Instruction Manual

(H) Protective function parameter
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 turns the CS signal ON.
(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 Between power supply and motor
MC3 Between inverter output and motor
• The input signals are as shown below.
Signal Function
CS Inverter/bypass
X84 Emergency drive execution
RES Operation status reset

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.

If the signal is turned OFF during the emergency drive operation, the operation will not be returned to normal.

MC operation

: MC-ON

: MC-OFF
—
: During inverter operation, MC2-OFF, MC3-ON
During commercial power supply operation, MC2-ON, MC3-OFF
Invariance: The status before changing the signal 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.
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PARAMETERS
Installation location
ON Inverter operation
OFF Emergency drive commercial power
supply operation
ON Emergency drive execution
OFF Normal operation
ON Reset
OFF Normal operation
Operation
During commercial power
supply operation
Shorted
Open
Operation


During inverter operation
Open
Shorted
MC operation

MC2 MC3




— —



Invariance
— —