Mitsubishi Electric FR-A800 Series Instruction Manual page 567

*7 MC2 opens when Pr.138 (Automatic bypass switching after inverter fault) = "0" (disabled), and MC2 closes when Pr.138 = "1" (enabled).
*8 MC operation is as shown below.
Notation
○
×
—
Unchanged
• Output signal list
Signal
MC1
MC2
MC3
 Electronic bypass operation sequence
• Example of operation sequence without automatic bypass sequence (Pr.139 = "9999")
Power supply
Operation interlock
(MRS)
Inverter run command
(STF)
Inverter/commercial
power supply (CS)
Inverter input side MC
(MC1)
Inverter output side MC
(MC3)
MC for commercial
power supply operation
(MC2)
Each timer
Operating status
(motor speed)
• Example of operation sequence with automatic bypass sequence (Pr.139 ≠ "9999", Pr.159 = "9999")
ON
STF
OFF
Output frequency Pr.139
Frequency command
Actual motor speed
INV ON
MC3
operation
OFF
Commercial
ON
MC2
power supply
OFF
operation
A : Pr.136 MC switchover interlock time
C : Pr.57 Restart coasting time
566
5. PARAMETERS
5.14 (A) Application parameters
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ON
OFF
MC2-OFF, MC3-ON during inverter operation,
MC2-ON, MC3-OFF during commercial power supply operation
The status of the MC remains the same after turning ON or OFF of the signal.
Terminal
(Pr.190 to Pr.196 setting)
17
18
19
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Off only at inverter alarm
OFF
ON
OFF
ON
OFF
Pr.136
Pr.57
INV
Coasting
operation
C A
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MC operation
Output signal to control MC1 installed on the inverter input side.
Output signal to control MC2 installed for commercial power supply operation.
Output signal to control MC3 installed on the inverter output side.
Pr.137
Pr.58
Pr.136 Pr.57
Bypass
INV
Coasting Stop
operation
operation
A B
B : Pr.137 Start waiting time
D : Pr.58 Restart cushion time
Description
ON : Operation enabled
OFF: Operation disabled
ON : Forward rotation
OFF: Stop
ON : Inverter operation
OFF: Commercial power supply operation
Indicates the delay time until
the MC turns on (off).
Pr.136 MC switchover interlock time
Pr.137 MC3 start (waiting time)
Pr.57 Reset time
Pr.58 Switchover cushion time
Time
Time
C D