Mitsubishi Electric FR-A820-00046 Instruction Manual page 694

(A) Application parameters
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.
MC1 turns OFF at an inverter fault.
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.
MC operation
 :
×:
⎯
:
Invariance:
● The output signals are as shown below.
Signal
MC1
MC2
MC3
Tab. 5-204: Output signals
Electronic bypass operation sequence
● Example of operation sequence without automatic bypass sequence (Pr. 139 = "9999")
ON
Power supply
OFF
ON
Operation interlock
(MRS)
OFF
ON
Inverter run command
(STF)
OFF
ON
Inverter/commercial
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)
Fig. 5-226: Signal timing when there is no automatic switchover sequence
5 - 492
MC-ON
MC-OFF
During inverter operation, MC2-OFF, MC3-ON
During commercial power supply operation, MC2-ON, MC3-OFF
The status before changing the signal ON or OFF is held.
Applied terminal
(Pr. 190 to Pr. 196 setting)
17
18
19
Off only at inverter alarm
Pr. 136
Pr. 57
INV Coasting Bypass
operation
operation
Description
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.
Pr. 137 Pr. 58
Pr. 136 Pr. 57
Coasting INV Stop
operation
Parameters
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
I002669E