Hitachi L300P - Manual (Page 102)

L300P Inverter
Configur
ing Dr
iv
e
P
a
ra
met
e
rs
3–33
Overload
Restriction If the inverter’s output current exceeds a
preset current level you specify during
acceleration or constant speed, the
overload restriction feature automati-
cally reduces the output frequency to
restrict the overload. This feature does
not generate an alarm or trip event. You
can instruct the inverter to apply
overload restriction only during
constant speed, thus allowing higher
currents for acceleration. Or, you may
use the same threshold for both acceler-
ation and constant speed. In the case of
controlled deceleration, the inverter monitors both output current and DC bus voltage. The
inverter will increase output frequency to try to avoid a trip due to over-current or over-voltage
(due to regeneration).
When the inverter detects an overload, it must decelerate the motor to reduce the current until it
is less than the threshold. You can choose the rate of deceleration that the inverter uses to lower
the output current.
0
Motor
Current
V
Output
Frequency
restriction area
B023
B022
t
“B” Function Run
Mode
Edit
Lo Hi
Defaults
Units SRW Display
Func.
Code
Name Description
–FE2
(CE)
–FU2
(UL)
–FR
(Jpn)
B021 Overload restriction
operation mode Select the operating mode
during overload conditions,
three options, option codes:
00 Disabled
01 Enabled for acceleration
and constant speed
02 Enabled for constant
speed only
03 Enabled for accel, decel,
and constant speed
✘ ✔ 01 01 01 — >b021 OLOAD
1MODE ON
B022 Overload restriction
setting Sets the level for overload
restriction, between 50%
and 150% of the rated
current of the inverter,
setting resolution is 1% of
rated current
✘ ✔
rated
cur-
rent
times
1.20
rated
cur-
rent
times
1.10
rated
cur-
rent
times
1.20
A >b022 OLOAD
1LEVEL 0024.8A
B023 Deceleration rate at
overload restriction Sets the deceleration rate
when inverter detects
overload, range is 0.1 to
30.0, resolution is 0.1.
✘ ✔ 1.00 15.0 1.00
sec. >b023 OLOAD
1CONST 01.00
B024 Overload restriction
operation mode (2) Select the operating mode
motor during overload
conditions, three options,
option codes:
00 Disabled
01 Enabled for acceleration
and constant speed
02 Enabled for constant
speed only
03 Enabled for accel, decel,
and constant speed
✘ ✔ 01 01 01 — >b024 OLOAD
2MODE ON