Hitachi L200 Manual Do Utilizador

Using Intelligent Output Terminals

Oper

ations

and Monitor

ing

The intelligent output terminals are programmable in a similar way to the intelligent 
input terminals. The inverter has several output functions that you can assign individu-
ally to three physical logic outputs. Two of the outputs are open-collector transistors, and 
the third output is the alarm relay (form C – normally open and normally closed 
contacts). The relay is assigned the alarm function by default, but you can assign it to 
any of the functions that the open-collector outputs use.

12

11

CM2

Open collector outputs

Load

Load

–
+

Logic output 

common

The open-collector transistor 
outputs can handle up to 
50mA each. We highly recom-
mend that you use an external 
power source as shown. It 
must be capable of providing 
at least 100mA to drive both 
outputs at full load. To drive 
loads that require more than 
50mA, use external relay 
circuits as shown to the right.

12

11

CM2

Open collector outputs

Load

Load

–
+

Logic output 

common

If you need output current 
greater than 50mA, use the 
inverter output to drive a small 
relay. Be sure to use a diode 
across the coil of the relay as 
shown (reverse-biased) in 
order to suppress the turn-off 
spike, or use a solid-state 
relay.