Hitachi SJ Series User Manual page 320

Chapter 12
12.13.8 Restarting after overcurrent
Q
• Overcurrent occurs rarely, but I want to restart
continuously as it is since there is no problem in the
system.
• I want the system continue to function in case of
overcurrent.
A
• In case of overcurrent, you can restart without
causing tripping.
Parameters
Item Parameter
Overcurrent
detection level
Overcurrent retry
count selection
Overcurrent tripping
retry selection
Overcurrent retry
standby time
(Ex. 1) When [bb-22] = 00, tripping occurs
Output current
Inverter
Output
Motor Speed
[AL]
Data
Inverter ND rated current
[bb160]
× (0.20~2.20)
[bb-22] 0~5 (Counts)
00
01
02
[bb-28]
03
04
[bb-29] 0.3~100.0(s)
Overcurrent Detection Level
Overcurrent error occurs
Free Running
!
• If overcurrent continues to be observed, there are
some possible causes: short acceleration time,
heavy load, locked motor, etc.
Sets the level at which the overcurrent is to be
detected.
Sets the retry counts in case of overcurrent. If this is
set to 0, the motor will trip upon overcurrent.
Restarts at 0 Hz
Restarts with the frequency matching
Restarts upon frequency pull-in
Detection speed (frequency) <v2.00 or higher>
Trips after decelerating and stopping with the
frequency matching
Restarts after waiting for the set time upon
overcurrent.
(Ex. 2) When [bb-22] ≠00 and [bb-28] = 00, it restarts
at 0 Hz.
Output Current
Inverter
Output
Motor Speed
[AL]
12-13-13
Inverter Function
Description
Overcurrent Detection Level
Free Running
Retry Standby Time