“B” Group: Fine-Tuning Functions
Configur
ing Dr
iv
e
P
a
ra
meters
3–30
“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
Func.
Code
Name/
Description
SRW
OPE
Range or Settings
Defaults
Run
Mode
Edit
Lo Hi
FEF2
FE2
(EU)
FUF2
FU2
(USA)
FF2
F2
(Jpn)
B001
Selection of automatic restart
mode
ALM
00
Alarm output after trip, automatic restart
disabled
00
00
00
✘ ✔
ZST
0 1
Restart at 0Hz
RST
02
Resume operation after frequency matching
FTP
03
Resume previous freq. after freq. matching,
then decelerate to stop and display trip info
FIX
04
Restart with active matching frequency