Hitachi L100 사용자 설명서

L100 Inverter

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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. 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.

Motor 

Current

Output 

frequency

B 22

B 23

t

t

Restriction area

0

0

B_21 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

✘

01

01

01

—

OLOAD MODE    ON

B_22 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 current x 1.25

A

OLOAD LVL 03.75A

B_23 Deceleration rate at 

overload restriction

Sets the deceleration rate when 
inverter detects overload, range 
is 0.1 to 30.0, resolution is 0.1.

✘

1.0

1.0

1.0

—

OLOAD CONST 01.0