Using Intelligent Output Terminals - Hitachi L100 Series Instruction Manual

Using Intelligent Output Terminals

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.
Sinking Outputs,
Open Collector
The open-collector transistor
outputs can handle up to
50mA each. We highly
recommend 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 below.
Sinking Outputs,
Open Collector with
External Relays
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.
L100 Inverter
Open collector outputs
Logic output
common
CM2
–
+
Load
L100 Inverter
Open collector outputs
Logic output
common
CM2
–
+
RY
4–21
L100 Inverter
12 11
Load
12 11
RY