Hitachi X200 Series - Manual (Page 109)

Overload Restriction
If the inverter’s output current exceeds a
preset current level you specify during
acceleration or constant speed, the overload
restriction feature automatically 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 acceleration and
constant speed.
When the inverter detects an overload, it
must decelerate the motor to reduce the
current until it s less than the threshold. You
can choose the rate of deceleration that the
inverter uses to lower the output current.
“B” Function Defaults
Func.
Code
Name /
SRW Display
Description
Run
Mode
Edit
-FE
(EU)
-FU
(USA)
Units
Overload restriction
operation mode
B021
OL Mode ON
U 01 01 −
Overload restriction
operation mode, 2nd motor
B221
2OL Mode ON
Select the operation mode during
overload conditions, three
options, option codes:
00
…Disabled
01 …Enabled for acceleration and
constant speed
02 …Enabled for constant speed
only
U 01 01 −
Overload restriction level
setting
B022
OL LVL 002.40A
U Rated
current
x 1.5
A
Overload restriction level
setting, 2nd motor
B222
2OL LVL 002.40A
Sets the level for overload
restriction, between 20% and
150% of the rated current of the
inverter, setting resolution is 1%
of rated current
U Rated
current
x 1.5
A
Deceleration rate at overload
restriction
B023
OL Cnst 0001.0s
U 1.0 30.0 sec.
Deceleration rate at overload
restriction, 2nd motor B223
2OL Cnst 0001.0s
Sets the deceleration rate when
inverter detects overload, range
is 0.1 to 30.0, resolution 0.1
U 1.0 30.0 sec.
Source of overload restriction
selection
B028
OL L_SLCT PARAM
Two option codes:
00
…set value of B022
01 …[O] input
U 00 00 −
Source of overload restriction
selection, 2nd motor B228
2OL L_SLCT PARAM
Two option codes:
00
…set value of B222
01 …[O] input
U 00 00 −
Frequency Pull-in Restart
See “ Restart Mode Configuration ” (B088) section on page 3-42 .
Motor
current
Restriction area
B022
0
t
Output
frequency
0
t
B022
3−35
Confi
guri
ng Driv
e
Parameters