“B” Group: Fine-Tuning Functions; Automatic Restart Mode And Phase Loss - Hitachi L300P Series Instruction Manual

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"B" Group: Fine-Tuning Functions
"B" Group: Fine-Tuning Functions
Automatic
Restart Mode and
Phase Loss
Func.
Name
Code
B001 Selection of automatic
restart mode
The "B" Group of functions and parameters adjust some of the more subtle but useful aspects
of motor control and system configuration.
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.
Power failure < allowable power fail
time (B002), inverter resumes
Input
power
Inverter
output
Motor
speed
0
Allowable
B002
power fail time
Retry wait time
"B" Function
Description
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
Input
power
Inverter
output
free-running
Motor
speed
t
Power failure
B003
Defaults
Run
Mode
Edit –FE2 –FU2
Lo Hi
(EU) (US)
✘ ✔
00 00
Power failure > allowable power
fail time (B002), inverter trips
free-running
0
Power failure
Allowable
B002
power fail time
Units SRW Display
–FR
(JP)
00 — >b001 IPS
POWER
t
ALM