Hitachi WJ200 Series

3−73
An additional parameter further configures
all instances of a free-run stop. Parameter
B003, Retry Wait Time Before Motor Restart,
sets the minimum time the inverter will
free-run. For example, if B003 = 4 seconds
(and B091=01) and the cause of the free-run
stop lasts 10 seconds, the inverter will
free-run (coast) for a total of 14 seconds
before driving the motor again.
The figure at below right describes how
active frequency matching resume operates.
After waiting the time set in B003, the
inverter tries to catch the speed of the motor
shaft and outputs the speed set in B030. At
this time, if the motor current rises up to the
value set in B028, the inverter decreases the
frequency according to the deceleration time
set in B029, and finally comes to the required
speed. Following are the related parameters
for this control.
Code Parameter contents
B028
Current level of active frequency
matching
B029
Deceleration rate of active frequency
matching
B030
Start freq. of active freq. matching
B088
Restart mode after FRS
B091
Stop mode selection
“b” Function
Run
Mode
Edit
Defaults
Func.
Code
Name Description Lnitial data Units
B088
Restart mode after FRS Selects how the inverter resumes
operation when free-run stop (FRS)
is cancelled, three options:
00…Restart from 0Hz
01…Restart from frequency detected
from real speed of motor (freq.
matching)
02…Restart from frequency detected
from real speed of motor (active
freq. matching)
U
00
−
B091
Stop mode selection Select how the inverter stops the
motor, two option codes:
00…DEC (decelerate to stop)
01…FRS (free-run to stop)
U
00
−
Motor
speed
Stop mode = free-run stop
B091 = 01
0
t
[FRS]
0
t
Resume from 0Hz
B088 = 00
Zero-frequency start
Zero frequency resume
Motor
speed
Stop mode = free-run stop
B091 = 01
0
t
[FRS]
0
t
Resume from current speed
B088 = 01
Wait time
B003
0
t
Motor
current
RMS
B030
B028
B029
Active frequency matching resume