Mitsubishi Electronics FR-A700 Manuel D’Utilisation

1)Procedure for operation

Operation pattern

2)Signal ON/OFF after parameter setting

Power supply 
ON

OFF

(OFF)

OFF

(OFF)

OFF

(OFF)

OFF 

→ ON

(OFF 

→ ON)

OFF

(OFF)

OFF 

→ ON

(OFF 

→ ON)

External operation mode
(PU operation mode)

At start 
(inverter)

OFF 

→ ON

OFF 

→ ON

OFF 

→ ON

ON

OFF

ON

At constant 
speed
(commercial 
power supply)

ON

ON 

→ 

OFF

ON

ON

OFF 

→ ON

ON 

→ OFF

MC2 turns ON after MC3 
turns OFF
(coasting status during this 
period)
Waiting time 2s

Switched to 
inverter for 
deceleration 
(inverter)

ON

OFF 

→ ON

ON

ON

ON 

→ 

OFF

OFF 

→ ON

MC3 turns ON after MC2
turns OFF
(coasting status during this
period)
Waiting time 4s

Stop

ON

ON

ON 

→ OFF

ON

OFF

ON

⋅ Connect the control power supply (R1/L11, S1/L21) in front of input side MC1. If the control power supply is connected behind

input side MC1, the electronic bypass sequence function is not executed.

⋅ The electronic bypass sequence function is valid only when Pr. 135  = "1" in the external operation or combined operation mode

(PU speed command, external operation command Pr. 79 = "3"). When Pr. 135 = "1" in the operation mode other than the above,
MC1 and MC3 turn ON.

⋅ When the MRS and CS signals are ON and the STF (STR) signal is OFF, MC3 is ON, but when the motor was coasted to a stop

from bypass operation last time, a start is made after the time set in Pr. 137  has elapsed.

⋅ Inverter operation can be performed when the MRS, STF (STR) and CS signals turn ON. In any other case (MRS signal - ON),

bypass operation is performed.

⋅ When the CS signal is turned OFF, the motor switches to bypass operation. However, when the STF (STR) signal is turned

OFF, the motor is decelerated to a stop in the inverter operation mode.

⋅ When both MC2 and MC3 are OFF and either MC2 or MC3 is then turned ON, there is a waiting time set in Pr. 136.
⋅ If electronic bypass sequence is valid (Pr. 135 = "1"), the Pr. 136 and Pr. 137  settings are ignored in the PU operation mode. The

input terminals (STF, CS, MRS, OH) of the inverter return to their normal functions.

⋅ When the electronic bypass sequence function (Pr. 135 = "1") and PU operation interlock function (Pr. 79  = "7") are used

simultaneously, the MRS signal is shared by the PU operation external interlock signal unless the X12 signal is assigned.
(When the MRS and CS signals turn ON, inverter operation is enabled)

⋅

⋅ Set the acceleration time to the level that does not activate the stall prevention operation.
⋅ Changing the terminal function using any of Pr. 178 to Pr. 189, 190 to Pr. 196 may affect the other functions. Set parameters after

confirming the function of each terminal.

♦ Parameters referred to ♦

Power supply ON

Setting the parameters

Start inverter operation

Constant-speed bypass 

operation

Deceleration (stop) 

inverter operation

⋅ Pr. 135 = "1" (open collector output terminal of inverter)
⋅ Pr. 136 = "2.0s"
⋅ Pr. 137 = "1.0s" (Set the time longer than the time from when 

MC3 actually turns ON until the inverter and motor are 
connected. If the time is short, a restart may not function 
properly.)

⋅ Pr. 57 = "0.5s"
⋅ Pr. 58 = "0.5s" (Be sure to set this parameter when 

bypass

 

operation is switched to inverter operation.)