Hitachi L300P - Manual (Page 97)

“B” Group: Fine-Tuning Functions
Configur
ing Dr
iv
e
P
a
ra
meters
3–28
“B” Group: Fine-Tuning Functions
The “B” Group of functions and parameters adjust some of the more subtle but useful aspects
of motor control and system configuration.
Automatic
Restart Mode and
Phase Loss The restart mode determines how the inverter will resume operation after a fault causes a trip
event. The four options provide advantages for various situations. Frequency matching allows
the inverter to read the motor speed by virtue of its residual magnetic flux and restart the output
at the corresponding frequency. The inverter can attempt a restart a certain number of times
depending on the particular trip event:
• Over-current trip, restart up to 3 times
• Over-voltage trip, restart up to 3 times
• Under-voltage trip, restart up to 16 times
When the inverter reaches the maximum number of restarts (3 or 16), you must power-cycle the
inverter to reset its operation.
Other parameters specify the allowable under-voltage level and the delay time before restarting.
The proper settings depend on the typical fault conditions for your application, the necessity of
restarting the process in unattended situations, and whether restarting is always safe.
Input
power
Motor
speed
Power failure
Inverter
output
Power failure > allowable power
fail time (B002), inverter trips
Input
power
Motor
speed
Inverter
output
Power failure < allowable power fail
time (B002), inverter resumes
Power failure
Retry wait time
Allowable
power fail time
Allowable
power fail time
free-running free-running
B002
B003
B002
t t 0 0
“B” Function Run
Mode
Edit
Lo Hi
Defaults
Units SRW Display
Func.
Code
Name Description
–FE2
(CE)
–FU2
(UL)
–FR
(Jpn)
B001 Selection of automatic
restart mode Select inverter restart
method, four option codes:
00 Alarm output after trip,
automatic restart
disabled
01 Restart at 0Hz
02 Resume operation after
frequency matching
03 Resume previous freq.
after freq. matching, then
decelerate to stop and
display trip info
✘ ✔
00 00 00 — >b001 IPS
POWER ALM