Power Failure Within Allowed Limits; Power Failure Longer Than Limits - Hitachi L300P Series Instruction Manual

4–44
Using Intelligent Output Terminals
Example 1: Power failure within allowed limits; resume
Power supply
Inverter output
Motor
frequency
After waiting for t
Opt.
Symbol Function Name
Code
08 IP Instantaneous
Power Failure
09 UV Under-voltage
condition
11, 12, AL0 – AL2
Valid for
outputs:
B001, B002, B003, B004,
Required
B005, B007
settings:
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
terminal [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 (value in B003) and restarts from
2
0 Hz (example 4). The display shows "0000"
during an actual frequency matching event.
In the following examples, t
power failure time (B002), and t
Free-run
t t
0 2
t
1
seconds when t < t ; restart
2 0 1
Output
State
ON when the inverter detects a loss of input
power
OFF when the inverter has input power
ON when the inverter input power is less than
the specified input range
OFF when the inverter input power is within
the voltage specification
Example: (Requires output configuration—
see page 3–48.)
24VDC
= instantaneous power failure time, t
0
= retry wait time (B003).
2
Example 2: Power failure longer than limits; trip
Power supply
Inverter output
Motor
frequency
t
Description
Inverter output terminal circuit
UV
12C 12A 11C 11A
+
L
–
See I/O specs on page 4–8.
= allowable under-voltage /
1
Free-run
t
0
t
1
Inverter trips when t > t
0 1
IP
L
t