B" Group: Fine-Tuning Functions - Hitachi SJ7002 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 Description
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
free-running
Motor
speed
0
Power failure
Allowable
B002
power fail time
Retry wait time
B003
SRW OPE
00
ALM Alarm output after trip, automatic restart
disabled
0 1
ZST Restart at 0Hz
02
RST Resume operation after frequency matching
03
FTP Resume previous freq. after freq. matching,
then decelerate to stop and display trip info
04
FIX Restart with active matching frequency
Power failure > allowable power
fail time (B002), inverter trips
Input
power
Inverter
output
Motor
speed
t 0
Range or Settings
free-running
t
Power failure
Allowable
B002
power fail time
Defaults
Run
Mode
FEF2 FUF2 FF2
Edit
FE2 FU2 F2
Lo Hi
(EU) (USA) (Jpn)
✘ ✔
00 00 00