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NOTE
• Connect the control power (R1/L11, S1/L21) in front of the input-side MC1. If the control power is connected behind the input-
side MC1, the electronic bypass sequence function will not operate.
• The electronic bypass sequence function is only enabled when Pr.135 = "1" and in the External operation mode or combined
operation mode (PU speed command and External operation command with Pr.79 = "3"). MC1 and MC3 turn ON when Pr.135
= "1" and in an operation mode other than mentioned above.
• MC3 turns ON when the MRS and CS signals are ON and the STF (STR) signals OFF. If the motor was coasted to a stop from
commercial power supply operation at the previous stop, the motor starts running only after waiting the time set in Pr.137.
• Inverter operation is only available when the MRS, STF (STR), and CS signals are ON. In all other cases (when the MRS signal
is ON), commercial power supply operation is available.
• When the CS signal is OFF, the motor switches to the commercial power supply operation. However, when the STF (STR)
signal is OFF, the motor decelerates to a stop during inverter operation.
• From the point where MC2 and MC3 are both turned OFF, there is a delay time set with Pr.136, till MC2 or MC3 is turned ON.
• Even when the electronic bypass sequence is enabled (Pr.135 = "1"), the Pr.136 and Pr.137 settings are ignored in PU
operation mode.
In addition, the input terminals (STF, CS, MRS, OH) return to perform their normal functions.
• When the electronic bypass sequence function (Pr.135 = "1") and PU operation interlock function (Pr.79 = "7") are used at the
same time, the MRS signal is shared with the PU operation external interlock if the X12 signal is not assigned. (The inverter
operation is available when the MRS and CS signals are ON.)
• Set the acceleration time to the level that does not activate the stall prevention operation.
• If switching to the commercial power supply operation while a failure such as an output short circuit has occurred between the
magnetic contactor MC3 and the motor, the damage may further spread. If a failure has occurred between the MC3 and the
motor, a protection circuit such as using the OH signal input must be provided.
• Changing the terminal functions with Pr.178 to Pr.189 and Pr.190 to Pr.196 may affect other functions. Set parameters after
confirming the function of each terminal.
• Switching with the electronic bypass sequence is not available during retry. Switching occurs after the retry. When the
electronic bypass is valid at a fault (Pr.138 = "1"), switching occurs also during retry.
• When the electronic bypass sequence function and the retry function of the converter unit are used at the same time for the
separated converter type, set 101 or more in the number of retries at fault occurrence (Pr.67) on the converter unit side. When
a value less than 100 is set, the ALM signal does not turn ON until the retry count is exceeded. In this case, the electronic
bypass at a fault is not performed until the retry count is exceeded.
 Operation in combination with the self power management function for
the separated converter type
• When the self power management function is used with the separated converter type, the input signal operations are as
follows.
X95
(Converter unit
(Converter unit
fault)
OFF
OFF
ON
ON
OFF
ON
*1
When Pr.138 = "0 (electronic bypass invalid at a fault)", MC2 is OFF. When Pr.138 = "1 (electronic bypass valid at a fault)", MC2 is ON.
*2
The self power management operation is followed.
*3
MC operation is as shown below.
Notation
×
392
5. PARAMETERS
5.11 (A) Application parameters
X96
X94
(Control signal for
fault (E.OHT,
main circuit power
E.CPU))
supply MC)
ON
OFF
ON
ON
OFF
ON
OFF
During inverter operation: MC2-OFF, MC3-ON
During commercial power supply operation: MC2-ON, MC3-OFF
*3
MC operation
MC1
MC2
MC3
*2
×
×
×
×
×
*2
*2
*1
×
*1
×
×
MC operation
Converter status
Converter fault
(E.OHT (Pr.248 = "2"))
Converter fault
(E.OHT (Pr.248 = "1"), E.CPU)
Converter normal
Converter fault
(other than the circuit failure fault or E.OHT)
(Pr.248 = "2")
Converter fault
(other than E.OHT or E.CPU)

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