Hitachi WJ Series User Manual page 213

Chapter 9
Active frequency matching restart at instantaneous power failure/undervoltage ([b001] = 04)
A
 To perform an active frequency matching restart when an instantaneous power
failure/undervoltage occurs, set the "Restart mode selection after instantaneous power
failure/undervoltage error [b001]" to "Active frequency matching restart (04)".
 Even when the active frequency matching restart is set, a trip occurs if the instantaneous power
failure/undervoltage time exceeds the "Instantaneous power failure/undervoltage allowed time
[b002]".
Code
Restart mode selection
[b001] after instantaneous power
failure/undervoltage error
Instantaneous power
[b002] failure/undervoltage
allowed time
Retry wait time after
[b003] instantaneous power
failure/undervoltage error
Number of retries after
[b005] instantaneous power
failure/undervoltage
Active frequency
[b028]
matching restart level
Active frequency matching
[b029]
restart constant (speed)
Active frequency matching
[b030]
restart speed selection
◼ (Example 2) When power returns within the
permissible time [b002]
Power
Inverter output
Motor speed
t0: Instantaneous power failure/undervoltage time,
t1: "Instantaneous power failure/undervoltage allowed time [b002]",
t2: "Retry wait time after instantaneous power failure/undervoltage error [b005]"
 "Enable instantaneous power failure/undervoltage error while in stop status [b004]" can be used
!
to disable instantaneous power failure/undervoltage errors while the inverter is stopped or
decelerating due to the RUN command being turned off. However, even if you use [b004] to
disable the instantaneous power failure/undervoltage trips during stop, the inverter trips if the
instantaneous power failure/undervoltage time exceeds the "Instantaneous power
failure/undervoltage allowed time [b002]".
 Even if the restart is set, an "Undervoltage error [E09]" trip occurs if the instantaneous power
failure/undervoltage continues for approximately 40 seconds.
 If the inverter control microcomputer is not supplied power because the power interruption lasts
for a long time, the inverter operates by restarting after reset release instead of the
instantaneous power failure/undervoltage restart.
Item
Performs the active frequency matching
restart.
If the power returns within this set time, the
inverter restarts. (Example 2)
If the instantaneous power failure/
undervoltage lasts for longer than this set
time, the inverter will trip. (Example 3)
Sets the wait time from when the power
returns until the restart.
16 times:
The inverter restarts up to the 16th
instantaneous power failure/undervoltage,
but trips for the 17th time and thereafter.
(The count is cleared by a reset input or
power interruption.)
Unlimited: No trips occur.
Sets the current limit value at the active
frequency matching restart.
Sets the deceleration time when the current
is increased.
Starts at the frequency of the previous power
interruption.
Starts at the maximum frequency setting.
Starts at the current command frequency.
Free running
t0 t2
Active frequency
t1
matching restart
9-7-5
Description
◼ (Example 3) When power returns after the
permissible time [b002]
Power
Inverter output
t1
Inverter Functions
Data
04
0.3 to 25.0 (s)
0.3 to 100.0 (s)
00
01
(0.2 to 2.0) × rated current (A)
(ND mode)
(0.2 to 1.5) × rated current (A)
(LD mode)
0.1 to 3000.0 (s)
00
01
02
Free running
Trip occurrence
t0