Hitachi L300P - Manual (Page 165)

L300P Inverter
Oper
ati
ons
and Monitor
ing
4–35
Using Intelligent Output Terminals
The intelligent relay terminals are programmable in a similar way to the intelligent input termi-
nals. The inverter has several output functions that you can assign individually to the two intel-
ligent relay outputs. They are normally open (type Form A). In addition to these relay outputs,
the alarm relay output (type Form C) has 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 the
other two relay outputs can use.
If you use an external supply to power the load(s), the relay contacts can switch up to several
amperes. See
“Specifications of Control and Logic Connections” on page 4–8 for relay contact
ratings.
It is possible to use the inverter’s +24VDC supply—however, the total output current available
is only 100mA. Note that this includes the loads of relay outputs and all input circuits, if you
are powering the inputs from the internal +24VDC supply. If you need more than 100mA, you
must use an external supply source.
In the unlikely event you need output
current greater than the relay’s contact
ratings (5A resistive, 1A inductive),
use the relay outputs to drive external
relays as shown to the right. 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.
Relay outputs
+ –
24VDC
Externally
powered system
L300P inverter
L L
12C 12A 11C 11A
Relay outputs
24VDC
Internally
powered system
L300P inverter
L L
12C 12A 11C 11A P24 CM1
+ –
100mA maximum
load current
RY
Relay outputs
+ –
24VDC
L300P inverter
12C 12A 11C 11A
RY