Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 535
Fr-a800 series
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NOTE
• Use the Electronic bypass function in External operation mode. In addition, the wiring terminals R1/L11 and S1/L21 must be
connected to a separate power source that does not go through MC1. Be sure to connect using a separate power supply.
• Be sure to provide a mechanical interlock for MC2 and MC3.
• Operation of magnetic contactor (MC1, MC2, MC3)
Magnetic
contactor
Between power supply and
MC1
inverter input side
Between power supply and
MC2
motor
Between inverter output side
MC3
and motor
• The input signals are as shown below.
Signal
Applied terminal
*1
MRS
MRS
CS
CS
STF
STF
(STR)
(STR)
Set "7" in any of Pr.180
OH
to Pr.189.
RES
RES
Set "95/96" in any of
X95/X96
Pr.180 to Pr.189.
*1
For separated converter types, the X10 signal is assigned to the terminal MRS in the initial setting. For the MRS signal, set "24" to any of Pr.180
to Pr.189 (input terminal function selection) to assign the function to another terminal.
*2
When the MRS signal is OFF, neither the commercial power supply operation nor the inverter operation can be performed.
*3
The CS signal operates only when the MRS signal is ON.
*4
STF (STR) operates only when the MRS and CS signals are both ON.
*5
The RES signal can be used for reset input acceptance with Pr.75 Reset selection/disconnected PU detection/PU stop selection. When RES
signal and another input signal are simultaneously input, the MC operation by the RES signal has a higher priority.
*6
MC1 turns OFF at an inverter fault.
*7
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.
*8
MC operation is as shown below.
Notation
○
×
—
Invariance
534
5. PARAMETERS
5.14 (A) Application parameters
During commercial
Installation location
Shorted
Shorted
Open
Function
Selects whether or not
operation is available.
Inverter/commercial
power supply operation
*3
switchover
Inverter operation
command
(Disabled during
commercial power
supply operation)
External thermal relay
input
Operation status reset
Converter unit fault /
Converter unit fault
(E.OHT, E.CPU)
ON
OFF
During inverter operation: MC2-OFF, MC3-ON
During commercial power supply operation: MC2-ON, MC3-OFF
The operation status before changing the signal state to ON or OFF is held.
Operation status
During inverter
power supply
operation
operation
Shorted
Open
Shorted
Operation status
ON Electronic bypass operation
available
*2
OFF Electronic bypass operation not
available
ON Inverter operation
OFF Commercial power supply
operation
ON Forward rotation (reverse
rotation)
OFF Stop
*4
ON Motor normal
OFF Motor fault
ON Reset
*5
OFF Normal operation
X95 signal OFF, X96 signal OFF
Converter fault (E.OHT, E.CPU)
X95 signal ON, X96 signal ON
Converter normal
X95 signal OFF, X96 signal ON
Converter fault (other than E.OHT or
E.CPU)
MC operation
During inverter fault
Open
(short by reset)
Open
(Selected by Pr.138. Always open
when the external thermal relay is
operating.)
Open
*8
MC operation
*6
MC1
MC2
MC3
○
—
—
○
×
Invariance
○
×
○
○
○
×
○
×
○
○
×
○
○
—
—
×
×
×
Invariance ×
Invariance
○
—
—
×
×
×
○
—
—
*7
×
×
—
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Troubleshooting
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