Hitachi SJ300-037HFE 사용자 설명서

SJ300 Inverter

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An instantaneous power failure (complete loss) or under-voltage condition (partial loss) of 
inverter input voltage can occur without warning. SJ300 Series inverters can be configured to 
respond to these conditions in different ways. You can select whether the inverter trips or retries 
(restart attempt) when an instantaneous power failure or under-voltage condition occurs. You 
can select the retry function with parameter B001.

When enabled, the Retry Function operates in the following ways:

• Under-voltage conditions – When an instantaneous power failure or under-voltage condi-

tion occurs, the inverter will attempt to restart up to 16 times. A trip condition will occur on 
the 17th attempt, which must be cleared with the Stop/Reset key.

• Over-current/voltage conditions – When retry function is selected and an over-current or 

an over-voltage condition occurs, a restart is attempted 3 times. A trip will occur on the 4th 
failed restart attempt. Use parameter B004 to select the trip and alarm response to instanta-
neous power failure and under-voltage conditions. The following table shows the related 
parameters to these power fault conditions, and timing diagrams are on the next page.

B001

Selection of 
automatic restart 
mode

00

Alarm output after trip, automatic 
restart disabled

01

Restart at 0 Hz

02

Retry with frequency matching to 
present motor speed

03

Retry with frequency matching 
followed by deceleration to stop— 
then trip alarm

B002

Allowable under-
voltage power failure 
time

0.3 to 1.0 sec.

The amount of time a power input 
under-voltage can occur without 
tripping the power failure alarm. If 
under-voltage exists longer than this 
time, the inverter trips, even if the 
restart mode is selected. If it exists 
less than this time retry will be 
attempted. 

B003

Retry wait time 
before motor restart

0.3 to 100 sec.

Time delay after a trip condition goes 
away before the inverter restarts the 
motor

B004

Instantaneous power 
failure / voltage trip 
alarm enable

00

Disable

01

Enable

02

Disable during stop and ramp to stop 

B005

Number of restarts 
on power failure / 
under-voltage trip 
events

00

Restart up to 16 times on instanta-
neous power failure or under-voltage

01

Always restart on instantaneous 
power failure or an under-voltage 
condition

B007

Restart frequency 
threshold

0.00 to 400.0 Hz

When frequency of the motor is less 
than this value, the inverter will 
restart at 0 Hz