Hitachi SJ7002 Series Instruction Manual page 212

4–50
Using Intelligent Output Terminals
Example 3: Motor resumes via frequency-matching
Power supply
Inverter output
Motor
frequency
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
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. In this case, the
inverter reads the motor RPM and direction. If this speed is higher than the matching setting
(B007), the inverter waits until they are equal and then engages the output to drive the motor
(example 3). If the actual motor speed is less than the restart frequency setting, the inverter
waits for t (value in B003) and restarts from 0 Hz (example 4). The display shows "0000"
2
during an actual frequency matching event.
Free-run
t t
0 2
Frequency matching
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
correspond to normal wiring of the inverter's control circuit. Examples 8 to 10 correspond to
the wiring of the inverter's control circuit for controlled deceleration after power loss (see
"Optional Controlled Decel and Alarm at Power Loss" on page
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
B007
Motor
frequency
t
Motor frequency < B007 value at t
2
Instantaneous power failure operation with R0–T0
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
Free-run
t t
0 2
0Hz restart
4–4).
connected to P–N
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
B007
t
2