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L300P Inverter
Operations
and Monitoring
4–45
Examples 3 and 4 relate to configuring the inverter to retry upon power failure. Frequency
matching is possible if the inverter frequency is greater than the B007 value.
The Instantaneous Power Failure and Alarm output responses during various power loss condi-
tions are shown in the diagram below. Use B004 to enable/disable the alarm output when
instantaneous power failure or under-voltage occurs. The alarm output will continue while the
control power of the inverter is present, even if the motor is stopped. Examples 5 to 7 corre-
spond to normal wiring of the inverter’s control circuit. Examples 8 to 10 correspond to the
wiring of the inverter’s control circuit for alarm output after power loss (see “
Optional Alarm
Output at Power Loss” on page 4–4).
Power supply
Inverter output
Motor
frequency
Motor frequency > B007 value at t
2
Example 3: Motor resumes via frequency-matching Example 4: Motor restarts from 0Hz
t
0
t
2
Power supply
Inverter output
Motor
frequency
t
0
t
2
Free-run Free-run
Frequency matching
0Hz restart
Motor frequency < B007 value at t
2
B007
B007
tt
Instantaneous power failure operation with standard
R0–T0 connections
Instantaneous power failure operation with R0–T0
connected to P–N
Example 5
Power
1
0
1
0
Run command
Output
Alarm
Inst. Power Fail
1
0
1
0
Inverter : Stop
Example 6
Power
1
0
1
0
Run command
Output
Alarm
Inst. Power Fail
1
0
1
0
Inverter : Stop
1
0
1
0
1
0
1
0
Power
Run command
Output
Alarm
Inst. Power Fail
Example 7
Inverter : Stop
Power
1
0
1
0
Run command
Output
Alarm
Inst. Power Fail
1
0
1
0
Inverter : Run
Power
1
0
Run command
Output
Alarm
Inst. Power Fail
1
0
1
0
Inverter : Run
1
0
1
0
1
0
1
0
Power
Run command
Output
Alarm
Inst. Power Fail
Inverter : Run
1
0
Example 8
Power
1
0
1
0
Run command
Output
Alarm
Inst. Power Fail
1
0
1
0
Inverter : Stop
Example 9
Power
1
0
1
0
Run command
Output
Alarm
Inst. Power Fail
1
0
1
0
Inverter : Stop
1
0
1
0
1
0
1
0
Power
Run command
Output
Alarm
Inst. Power Fail
Example 10
Inverter : Stop
Power
1
0
1
0
Run command
Output
Alarm
Inst. Power Fail
1
0
1
0
Inverter : Run
Power
1
0
Run command
Output
Alarm
Inst. Power Fail
1
0
1
0
Inverter : Run
1
0
1
0
1
0
1
0
Power
Run command
Output
Alarm
Inst. Power Fail
Inverter : Run
1
0
(under-voltage)