Electronic thermal overload alarm setting – Hitachi L300P User Manual
Page 98
L300P Inverter
Configur
ing Dr
iv
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P
a
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3–29
CAUTION: When a loss of phase occurs, increased ripple current will markedly reduce main
capacitor life over time. Diode bridge failure can also result. If phase loss occurs under load,
the inverter could be damaged. Please pay particular attention to the setting of function B006.
Electronic
Thermal Overload
Alarm Setting
The thermal overload detection protects
the inverter and motor from overheating
due to an excessive load. It uses a current/
inverse time curve to determine the trip
point. The thermal overload alarm [THM]
is the resulting intelligent output.
First, use B013 to select the torque
characteristic that matches your load.
This allows the inverter to utilize the best
thermal overload characteristic for your
application.
B002
Allowable under-
voltage power failure
time
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. Range is 0.3 to
1.0 sec.
✘ ✔
1.0
1.0
1.0
sec.
>b002 IPS
TIME 1.0s
B003
Retry wait time before
motor restart
Time delay after a trip
condition goes away before
the inverter restarts the
motor.
Range is 0.3 to 100 seconds.
✘ ✔
1.0
1.0
1.0
sec.
>b003 IPS
WAIT 001.0s
B004
Instantaneous power
failure / under-voltage
trip alarm enable
Three option codes:
00 Disable
01 Enable
02 Disable during stop and
ramp to stop
✘ ✔
00
00
00
—
>b004 IPS
TRIP OFF
B005
Number of restarts on
power failure / under-
voltage trip events
Two option codes:
00 Restart 16 times
01 Always restart
✘ ✔
00
00
00
—
>b005 IPS
RETRY 16
B006
Phase loss detection
enable
Two option codes:
00 Disable – no trip on
phase loss
01 Enable – trip on phase
loss
✘ ✔
00
00
00
—
>b006 PH-FAIL
SELECT OFF
B007
Restart frequency
threshold
When the frequency of the
motor is less than this value,
the inverter will restart at
0 Hz.
Range is 0.00 to 400.0 Hz
✘ ✔ 0.00 0.00 0.00
Hz
>b007 IPS
F 0000.00Hz
“B” Function
Run
Mode
Edit
Lo Hi
Defaults
Units
SRW Display
Func.
Code
Name
Description
–FE2
(CE)
–FU2
(UL)
–FR
(Jpn)
x 1.0
0
Output frequency
Hz
x 0.8
x 0.6
5
20
60
120
Constant torque
Reduced
torque
B013=01
B013=00
Trip current
reduction
factor