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Using Intelligent Output Terminals
Operations
and Monitoring
4–52
In the following examples, t
0
= instantaneous power failure time, t
1
= allowable under-voltage /
power failure time (B002), and t
2
= retry wait time (B003).
Opt.
Code
Symbol Function Name
Output
State
Description
08 IP Instantaneous
Power Failure
ON when the inverter detects a loss of input
power
OFF when the inverter has input power
09 UV Under-voltage
condition
ON when the inverter input power is less than
the specified input range
OFF when the inverter input power is within
the voltage specification
Valid for
outputs:
11, 12, 13, 14, 15,
AL0 – AL2
Required
settings:
B001, B002, B003, B004,
B005, B007
Notes:
• If an over-voltage or over-current trip occurs
during the deceleration and an instantaneous
power failure error (E16) is displayed the
inverter goes into free-run stop. In this case
make the deceleration time longer.
• When connecting control power supply
terminals [Ro]-[To] to the DC bus [P]-[N], an
under-voltage may be detected at power-off
and cause a trip. If this is undesirable, set
B004 to 00 or 02.
• Frequency matching: 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
2
(value in B003) and restarts from
0 Hz (example 4). The display shows “0000”
during an actual frequency matching event.
See I/O specs on page 4–9.
Inverter output
terminal circuit
CM2
1314
15
11
12
Example: (Default output configuration
shown—see page 3–53
.)
RY
+
–
IP
Power supply
Inverter output
Motor
frequency
After waiting for t
2
seconds when t
0
< t
1
; restart
Example 1: Power failure within allowed limits; resume Example 2: Power failure longer than limits; trip
t
0
t
1
t
2
Power supply
Inverter output
Motor
frequency
t
0
t
1
Inverter trips when t
0
> t
1
Free-run Free-run
tt