Hitachi WJ200-001S Instruction Manual page 259

452
Internal Relay Output
The inverter has an internal relay output with
normally open and normally closed contacts
(Type 1 form C). The output signal that
controls the relay is configurable; the Alarm
Signal is the default setting. Thus, the
terminals are labeled [AL0], [AL1], [AL2], as
shown to the right. However, you can assign
any one of the nine intelligent outputs to the
relay. For wiring purposes, the general
terminal functions are:
 [AL0] – Common contact
 [AL1] – Normally open contact
 [AL2] – Normally closed contact
The relay itself can be configured as "normally open or closed." Parameter , Alarm
Relay Active State, is the setting. This setting determines whether or not the relay coil
is energized when its output signal is OFF:

=

=
Since the relay already has normally open
[AL1] and normally closed [AL2] contacts, the
purpose of the ability to invert the relay coil's
active state may not be obvious.
determine whether or not an inverter power
loss causes the relay to change state.
default relay configuration is the Alarm Signal
(=), as shown to the right. And,
sets the relay to "normally closed" (relay coil
normally energized). The reason for this is that
a typical system design will require an inverter
power loss to assert an alarm signal to external
devices.
The relay can be used for other intelligent
output signals, such as the Run Signal (set
=). For these remaining output signal
types, the relay coil typically must NOT change
state upon inverter power loss (set =).
The figure to the right shows the relay settings
for the Run Signal output.
If you assign the relay an output signal other
than the Alarm Signal, the inverter can still
have an Alarm Signal output. In this case, you
can assign it to terminal [11] , providing an
open collector output.
– "Normally open" (relay coil is de-energized when output signal is OFF)
– "Normally closed" (relay coil is energized when the output signal is OFF)
Inverter logic
circuit board
It allows you to
=
The
=
=
Relay shown with inverter
power ON, Alarm Signal OFF
Inverter logic
circuit board
=
=
Relay shown with inverter
power ON, Run Signal OFF
Inverter logic
circuit board
AL0 AL1 AL2
AL
AL0 AL1 AL2
RUN
AL0 AL1 AL2