Hitachi L2002 Overload Advance Notice Signal

4–41

L2002 Inverter

Overload Advance Notice Signal

When the output current exceeds a preset value, the [OL] terminal signal turns ON. The parameter C041 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
						power running
	C041
	C041				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, AL0 – AL2

Example (requires output configuration—

see page 3–54):

Required settings:

C041

Notes:

Inverter output

OL

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

terminal circuit

from the default, set C041 (overload level).

• The accuracy of this function is the same as the

CM2

12

11

function of the output current monitor on the [FM]

terminal (see “Analog Output Operation” on

page 4–55).

• The example circuit for terminal [12] drives a relay

+

–

RY

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.

Example for terminals [AL0], [AL1], [AL2]

(requires output configuration—

see pages 4–36 and 3–54):

Inverter logic

OL

circuit board

		AL0	AL1		AL2
	Power
See I/O specs				Load
	supply
on page 4–6.

Operations Monitoring and