Mitsubishi Electric FR-A700 Instruction Manual page 688

Special operation
Signal ON/OFF after parameter setting
Power
supply ON
At start
(inverter)
At constant
speed
(commer-
cial power
supply)
Switched to
inverter for
deceleration
(inverter)
Stop
Fig. 6-252: Signals after parameter setting
NOTES 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 commercial power supply-inverter
switchover sequence function is not executed.
The commercial power supply-inverter switchover 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 commercial power supply operation last time, a start is
made after the time set to 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), commercial power supply operation is performed.
When the CS signal is turned off, the motor switches to commercial power supply 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 wait-
ing time set in Pr. 136.
If commercial power supply-inverter switchover sequence is made 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 commercial power supply-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)
Changing the terminal function using any of Pr. 178 to Pr. 189, 190 to Pr. 196 may affect the
other functions. Please make setting after confirming the function of each terminal.
6 - 508
MRS CS
OFF OFF
(OFF) (OFF) (OFF)
OFF → ON OFF → ON OFF → ON
ON → OFF
ON
OFF → ON
ON
ON → OFF
ON ON
STF MC1 MC2
OFF → ON
OFF OFF
(OFF → ON)
(OFF)
ON OFF
OFF → ON
ON ON
ON → OFF
ON ON
ON OFF
Parameter
MC3 Remarks
External operation
OFF → ON
mode (PU opera-
(OFF → ON)
tion mode) (refer
to note 2)
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