Mitsubishi Electric FR-A700 Technical Manual page 386

(3) Operating procedure
1) Operating procedure for operation
Operation pattern
Power supply ON
Setting the parameters
Start inverter operation
Constant-speed bypass operation
Deceleration (stop) inverter operation
2) Signal ON/OFF after parameter setting
MRS
OFF
Power-on
(OFF)
At start
OFF
(inverter)
At constant speed
ON
(bypass)
Switched to inverter
for deceleration
ON
(inverter)
Stop ON
*1 In the operation mode other than External operation or combined operation mode (PU speed command, external operation
command [Pr. 79 = 3]), MC1 and MC3 turn ON.
*2 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.
*3 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.
*4 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.
*5 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].
*6 When the electronic bypass-inverter switchover 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.)
CS STF
OFF OFF
(OFF) (OFF)
ON OFF ON OFF ON
ON
ON OFF
ON
OFF ON
ON
ON OFF
• [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.)
MC1 MC2
OFF ON OFF
(OFF)
(OFF ON)
ON OFF
ON
OFF ON
ON
ON OFF
ON OFF
420
PARAMETER
MC3 REMARKS
OFF ON External operation mode
(PU operation mode)
(OFF ON)
ON
MC2 turns ON after MC3 turns
OFF
ON OFF
(coasting status during this
period) waiting time 2s
MC3 turns ON after MC2 turns
OFF
OFF ON
(coasting status during this
period) waiting time 4s
ON