Hitachi L100 instruction manual Overload Advance Notice Signal, Oi L

4–20

Using Intelligent Output Terminals

Overload Advance Notice Signal

When the output current exceeds a preset value, the [OL] terminal signal turns on. The parameter C41 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

set C41

value C41

[OL]

Signal

	threshold
	power running
	regeneration
	threshold
ON	ON
threshold	time

Operations and Monitoring

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:
Required settings:		C41
					Inverter output			OL
Notes:					terminal circuit
• The default value is 100%. To change the level
from the default, set		C41 (overload level).			H O OI L		FM CM2 12 11

•The accuracy of this function is the same as the

function of the output current monitor on the [FM]
terminal (see page 4–25).	+	RY
	–
	See I/O specs on page 4–5.

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.