Mitsubishi Electric FR-A500 Instruction Manual page 156

(2) Parameter setting
Parameter
Name
Number
Commercial power
supply-inverter
135 switchover sequence
output terminal
selection
MC switchover
136
interlock time
137 Start waiting time
Commercial power
supply-inverter
138
switchover selection
at alarm occurrence
Automatic inverter-
commercial power
139
supply switchover
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 switchover frequency, inverter
operation is switched to commercial power supply operation. If the inverter's operation command
value is then lowered to or below the switchover 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>
Power
Operation interlock
(MRS)
Inverter operation command
(STF)
Inverter-commercial power supply switch-over
(CS)
Commercial power supply-inverter switch-over
(MC1)
Commercial power supply-inverter switch-over
(MC3)
Commercial power supply-inverter switch-over
(MC2)
Each timer
Operating status
(Motor speed)
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).
0 to 100.0 s Sets the MC2 and MC3 operation interlock time.
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 operation
0 to 60.0Hz
is automatically switched to commercial power supply operation. Start and
stop are controlled by the inverter operation command (STF or STR).
9999 Automatic switchover is not done.
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Off for inverter fault only
OFF
ON
OFF
ON
OFF
A A,B C, A
D
Coast to stop
Inverter Coasting
operation
Commercial power Commercial power
supply stop supply operation
Description
Operation command
Actual operation (Note)
A B C,D
Inverter Stop Inverter
Coasting
operation
147
PARAMETERS
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.
Each timer
A: Pr. 136 MC switch-over interlock time
B: Pr. 137 MC3 start commencement
(start waiting time)
C: Pr. 57 (reset time)
D: Pr. 58 (switch-over cushion time)
operation
4