Mitsubishi Electric FR-A700 Technical Manual page 384

(2) Operation
1) Input signal function
Signal Terminal Used
MRS MRS
CS
STF STF
(STR) (STR)
Set 7 in any of
OH
[Pr. 180 to 189]
RES RES
*1 Unless the MRS signal is turned ON, neither commercial power supply operation nor inverter operation can be
performed.
*2 The CS signal functions only when the MRS signal is ON.
*3 STF (STR) functions only when both the MRS signal and CS signal are ON.
*4 The RES signal enables reset input acceptance selection using [Pr. 75 Reset selection/disconnected PU detection/PU stop
selection].
*5 MC1 turns OFF when an inverter fault occurs.
*6 MC operation
: MC-ON
×
: MC-OFF
–
: Inverter operation
Bypass operation
No change : The status before the signal turns ON or OFF is held.
2) Output signal function
Signal
([Pr. 190 to 196] Setting)
MC1
MC2
MC3
3) When performing bypass operation
Cancel an operation interlock signal (by turning
ON MRS signal). When signal CS is OFF, bypass
operation is performed.
4) When performing inverter operation
Cancel an operation interlock signal (by turning
ON MRS signal), and turn ON CS signal. By
turning ON/OFF the inverter's start signal (STF
(STR)) , perform inverter operation.
5) When switching from inverter operation to bypass
operation
Turn ON → OFF CS signal.
6) When switching from bypass operation to inverter
operation
Turn OFF → ON CS signal, and turn ON the
inverter's start
instantaneous power failure function is set at this
time, smooth switchover without decreasing the
motor speed is performed.
7) When switching to bypass operation at inverter
fault
When [Pr. 138 = 1], the operation automatically
switches to commercial operation if an inverter
fault has occurred during inverter operation.
Functions
Operation enable/
disable selection
Inverter/electronic
CS
bypass switchover
Inverter operation
command
(invalid for bypass
operation)
*3
External thermal relay
input
Operating status
initialization
*4
MC2 is OFF and MC3 is ON
.....
..... MC2 is ON and MC3 is OFF
Terminal Used
17 Control signal output of inverter input side magnetic contactor MC1
18 Control signal output of bypass operation magnetic contactor MC2
19 Control signal output of inverter output side magnetic contactor MC3
signal (STF (STR)).
Operation
ON ........Bypass-inverter operation
enabled
OFF ......Bypass-inverter operation
*1
disabled
ON ........Inverter running
OFF ......Bypass operation
*2
ON ........Forward rotation (reverse
rotation)
OFF ......Stop
ON ........Motor normal
OFF ......Motor error
ON ........Initialization
OFF ......Normal operation
Description
Note that automatic switchover can not be made if
E.CPU appears.
Operation interlock
Inverter/bypass
Inverter run command
Inverter input side MC
MC for bypass
operation (MC2)
If an
Inverter output side MC
Operation timing example of the MC
418
MC Operation
MC1
*5
×
No change
ON
MRS)
OFF
ON
CS)
OFF
ON
STF)
OFF
ON
(MC1)
OFF
ON
[Pr.136, 137]
OFF
ON
(MC3)
OFF
PARAMETER
*6
MC2 MC3
— —
×
No change
×
×
×
×
— —
× ×
×
No change
— —
[Pr.136]