Hitachi L100 Overload Advance Notice Signal

4–25

L100 Inverter

Overload Advance Notice Signal

When the output current exceeds a preset value, the [OL] terminal signal turns ON. The parameter C_41 sets the overload threshold. The overload detection circuit operates during powered motor operation and during regenerative braking. The output circuits use open-collector transistors, and are active low.

Current							threshold
	C 41					power running
	C 41				regeneration
[OL]		1	ON	threshold
								ON
Signal		0

t

Option

Terminal

Function Name

Output

Description

Code

Symbol

State

03

OL

Overload Advance

ON

when output current is more than the set thresh-

Notice Signal

old for the overload signal

OFF

when output current is less than the set threshold

for the overload signal

Valid for outputs:

11, 12

Example (requires output configuration—

see page 3–36):

Required settings:

C_41

Notes:

Inverter output

OL

• The default value is 100%. To change the level

terminal circuit

from the default, set C_41 (overload level).

• The accuracy of this function is the same as the

H

O

OI

L

FM

CM2

12

11

function of the output current monitor on the [FM]

terminal (see page “Analog and Digital Monitor

Output” on page 4–30).

+

–

RY

See I/O specs on page 4–6.

NOTE: The example circuit in the table above drives a relay coil. Note the use of a diode to prevent the negative-going turn-off spike generated by the coil from damaging the inverter’s output transistor.

Operations Monitoring and