Overload Restriction - Hitachi SJ200 Series Instruction Manual

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 is less than the threshold.
You can choose the rate of deceleration that
the inverter uses to lower the output current.
Func. Name /
Code SRW Display
B021 Overload restriction
operation mode
OL Mode
B022 Overload restriction
setting
OL LVL 002.40A
B023 Deceleration rate at
overload restriction
OL Cnst 0001.0s
"B" Function
Description
Select the operating mode
during overload conditions,
three options, option codes:
ON
00... Disabled
01... Enabled for acceleration
and constant speed
02... Enabled for constant
speed only
Sets the level for overload
restriction, between 20% and
150% of the rated current of
the inverter, setting resolution
is 1% of rated current
Sets the deceleration rate when
inverter detects overload, range
is 0.1 to 30.0, resolution is 0.1.
SJ200 Inverter
Motor
Current
Restriction area
B022
0
Output
frequency
0
B023
Run
Mode
–FEF
Edit
(EU)
01
Rated current x
1.5
1.0
3–33
t
t
Defaults
–FU
Units
(USA)
01 —
A
30.0 sec.