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Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual Page 146

Transistorized inverter, high function & low acoustic noise.
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( 2 ) Parameter setting
Parameter
Name
Number
Commercial power
supply-inverter
135
switch-over
sequence output
terminal selection
MC switch-over
136
interlock time
137
Start waiting time
Commercial power
supply-inverter
138
switch-over selection
at alarm occurrence
Automatic inverter-
commercial power
139
supply switch-over
frequency
Note: 1. Pr. 139 functions when Pr. 135 setting is other than "0".
2. When the motor started by the inverter reaches the automatic switch-over frequency, inverter
operation is switched to commercial power supply operation. If the inverter's run command value is
then lowered to or below the switch-over frequency, commercial power supply operation is not
automatically switched to inverter operation.
Switch off the inverter operation command signal (STF or STR) to switch commercial power supply
operation to inverter operation and decelerate the motor to a stop.
<Operation sequence>
ON
Power
OFF
Operation interlock
ON
(MRS)
OFF
ON
Inverter operation command
(STF)
OFF
Inverter-commercial power supply switch-over
ON
(CS)
OFF
Commercial power supply-inverter switch-over
ON
(MC1)
OFF
Commercial power supply-inverter switch-over
ON
(MC3)
OFF
Commercial power supply-inverter switch-over
ON
(MC2)
OFF
Each timer
Operating status
(Motor speed)
Commercial power
supply stop
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Setting
Sequence output is not provided. (Pr. 136, Pr. 137, Pr. 138 and Pr. 139
0
settings are ignored.)
Sequence output is provided.
When MC1 to MC3 are assigned with Pr. 190 to Pr. 195 (output terminal
1
function selection), open collector outputs are provided. When they are not
assigned, relay outputs are provided from the FR-A5AR (option).
Sets the MC2 and MC3 operation interlock time.
0 to 100.0 s
Set a slightly longer (about 0.3 to 0.5 s) value than the time from when the
0 to 100.0 s
ON signal enters inverter operation MC3 to when it actually switches on.
Stops inverter operation and coasts the motor.
0
The inverter stops when an inverter fault occurs (both MC2 and MC3 switch
off).
Stops inverter operation and automatically switches inverter operation to
commercial power supply operation.
1
When an inverter fault occurs, inverter operation is automatically switched to
commercial power supply operation (MC2: ON, MC3: OFF).
The motor is started and run by the inverter up to the set frequency, and
when the output frequency reaches or exceeds the set frequency, inverter
0 to 60.0Hz
operation is automatically switched to commercial power supply operation.
Start and stop are controlled by the inverter operation command (STF or
STR).
9999
Automatic switch-over is not done.
Off for inverter fault only
Operation command
Actual operation (Note)
A
A,B
C,
A
A
D
Coast to stop
Inverter
Coasting
Coasting
operation
Commercial power
supply operation
133
PARAMETERS
Description
ON: Operation enable
OFF: Operation disable
ON: Forward rotation
OFF: Stop
ON: Inverter operation
OFF: Commercial power supply operation
Note: Indicates a delay until MC switches on.
B
C,D
Each timer
A: Pr. 136 (MC switch-over interlock time)
B: Pr. 137 (MC start waiting time)
C: Pr. 57 (reset time)
D: Pr. 58 (switch-over cushion time)
Inverter
Stop Inverter
operation
operation

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