Hitachi WJ200 Series Instruction Manual page 154

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
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
Func.
Name
Code
Restart mode after FRS
B088
Stop mode selection
B091
Parameter contents
"b" Function
Description
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)
Select how the inverter stops the
motor, two option codes:
00...DEC (decelerate to stop)
01...FRS (free-run to stop)
Zero frequency resume
B091 01
= Stop mode = free-run stop
B088 00
= Resume from 0Hz
[FRS]
0
Zero-frequency start
Motor
speed
0
Active frequency matching resume
B091 01
=
Stop mode = free-run stop
B088 01
= Resume from current speed
[FRS]
0
Wait time
B003
Motor
speed
0
Motor
current
RMS
0
Run
Mode
Edit
3−73
t
t
t
B030
B029
t
B028
t
Defaults
Lnitial data Units
00 −
00 −