Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 536

• The output signals are as shown below.
Signal
MC1
MC2
MC3
 Electronic bypass operation sequence
• Example of operation sequence without automatic bypass sequence (Pr.139 = "9999")
ON
Power supply
OFF
Operation interlock ON
(MRS)
OFF
Inverter run command ON
(STF)
OFF
Inverter/commercial ON
power supply (CS)
OFF
ON
Inverter input side MC
(MC1)
OFF
ON
Inverter output side MC
(MC3)
OFF
ON
MC for commercial
power supply operation
OFF
(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
C
A : Pr.136 MC switchover interlock time
C : Pr.57 Restart coasting time
Applied terminal
(Pr.190 to Pr.196 setting)
17
18
19
Off only at inverter alarm
Pr.136
Pr.57
Bypass
INV
Coasting
operation
operation
A
B : Pr.137 Start waiting time
D : Pr.58 Restart cushion time
Operation output signal of the magnetic contactor MC1 on
the inverter's input side.
Operation output signal of the magnetic contactor MC2
for the commercial power supply operation.
Operation output signal of the magnetic contactor MC3 on
the inverter's output side.
ON : Operation enabled
OFF: Operation disabled
ON : Forward rotation
OFF: Stop
ON : Inverter operation
OFF: Commercial power supply operation
Pr.137
Pr.58
Pr.136 Pr.57
INV
Coasting Stop
operation
A B C D
Description
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
5. PARAMETERS
5.14 (A) Application parameters
1
2
3
4
5
6
7
8
9
10
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