Motor Resumes Via Frequency-Matching; Motor Restarts From 0Hz; Instantaneous Power Failure Operation With R0–T0 Connected To P–N - Hitachi L300P Series Instruction Manual

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.
Example 3: Motor resumes via frequency-matching
Power supply
Inverter output
Motor
frequency
Motor frequency > B007 value at t
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
Output at Power Loss" on page
Instantaneous power failure operation with standard
R0–T0 connections
Example 5
Inverter : Stop
1
Power
0
1
Run command
0
Output
1
Alarm
0
1
Inst. Power Fail
0
Example 6
Inverter : Stop
1
Power
0
1
Run command
0
Output
1
Alarm
0
1
Inst. Power Fail
0
Example 7
Inverter : Stop
1
Power
0
1
Run command
0
Output
1
Alarm
0
1
Inst. Power Fail
0
Free-run
B007
t
t t
0 2
Frequency matching
2
4–4).
Inverter : Run
1
Power
0
1
Run command
0
Output
1
Alarm
0
1
Inst. Power Fail
0
Inverter : Run
1
Power
0
1
Run command
0
Output
1
Alarm
0
1
Inst. Power Fail
0
Inverter : Run
1
Power
0
1
Run command
0
Output
1
Alarm
0
1
Inst. Power Fail
0
Example 4: Motor restarts from 0Hz
Power supply
Inverter output
Motor
frequency
Motor frequency < B007 value at t
Instantaneous power failure operation with R0–T0
connected to P–N
Example 8
Inverter : Stop
1
Power
0
1
Run command
0
Output
1
Alarm
0
1
Inst. Power Fail
0
Example 9
Inverter : Stop
1
Power
0
1
Run command
0
Output
1
Alarm
0
(under-voltage)
1
Inst. Power Fail
0
Example 10
Inverter : Stop
1
Power
0
1
Run command
0
Output
1
Alarm
0
1
Inst. Power Fail
0
4–45
L300P Inverter
Free-run
B007
t
t t
0 2
0Hz restart
2
"Optional Alarm
Inverter : Run
1
Power
0
1
Run command
0
Output
1
Alarm
0
1
Inst. Power Fail
0
Inverter : Run
1
Power
0
1
Run command
0
Output
1
Alarm
0
1
Inst. Power Fail
0
Inverter : Run
1
Power
0
1
Run command
0
Output
1
Alarm
0
1
Inst. Power Fail
0