Hitachi WJ C1 Series User Manual

Chapter 9 Inverter Functions
9-7-5
Active frequency matching restart at instantaneous power failure/undervoltage ([b001] = 04)
 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
Item
Description
Data
[b001]
Restart mode selection
after instantaneous power
failure/undervoltage error
Performs the active frequency matching
restart.
04
[b002]
Instantaneous power
failure/undervoltage
allowed time
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)
0.3 to 25.0 (s)
[b003]
Retry wait time after
instantaneous power
failure/undervoltage error
Sets the wait time from when the power
returns until the restart.
0.3 to 100.0 (s)
[b005]
Number of retries after
instantaneous power
failure/undervoltage
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.)
00
Unlimited: No trips occur.
01
[b028]
Active frequency
matching restart level
Sets the current limit value at the active
frequency matching restart.
(0.2 to 2.0) × rated current (A)
(ND mode)
(0.2 to 1.5) × rated current (A)
(LD mode)
[b029]
Active frequency matching
restart constant (speed)
Sets the deceleration time when the current
is increased.
0.1 to 3000.0 (s)
[b030]
Active frequency matching
restart speed selection
Starts at the frequency of the previous power
interruption.
00
Starts at the maximum frequency setting.
01
Starts at the current command frequency.
02
 "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.
t0
t2
t1
Free running
Power
Inverter output
Motor speed
Active frequency
matching restart
◼ (Example 2) When power returns within the
permissible time [b002]
t1
t0
Free running
Power
◼ (Example 3) When power returns after the
permissible time [b002]
Inverter output
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]"
Trip occurrence
A
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Hitachi WJ C1 Series Specifications

General

Brand	Hitachi
Model	WJ C1 Series
Category	Inverter
Language	English