MAN1106-07-EN_XL+_UserManual
M a y 6
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8.5 Relay Outputs
Relay outputs are designed to switch loads that typically have high voltage or current
requirements or require the isolation that relays provide.
NOTE: The design of the XL+ OCS does not require external coil power for the relays to function.
The relays will activate anytime the XL+ OCS is powered.
There are several factors that should be considered when using relays:
•
Relay Life
–
Relays are mechanical devices that have a long but limited life. Typically,
switching more current limits the life of relays. Please check the data sheets for expected
relay life.
•
Current / Temperature De-Rating
–
Products containing relays often have total current limits
based on the ambient temperature of the application. Please see the product data sheet for
current / temperature de-rating information for relays.
•
Fusing
–
External fusing is generally required to protect the relays, devices, and wiring from
shorts or overloads.
Protection for Inductive Loads
—
Inductive loads can cause reverse currents when they shut off
that can shorten the life of relay contacts. Some protective measures need to be determined
by an engineer. If you have questions on protection from inductive load, consult Technical
Support. Details on devices that may protect outputs can be found in MAN0962.
Output State on Controller Stop
—
When the controller is stopped, the operation of each output
is configurable. The outputs can hold the state they were in before the controller stopped, or
they can go to a predetermined state. By default, relay outputs turn off. For more information
on Stop State see the
001XLE015
0V ON J1
12-24VDC
R2
C2
R3
C3
R6
C6
R4
C4
R5
C5
R1
C1
H4
H2
H3
LOAD
230VAC
OR
25VDC
N
L
LOAD
230VAC
OR
25VDC
N
L
LOAD
230VAC
OR
25VDC
N
L
LOAD
230VAC
OR
25VDC
N
L
LOAD
230VAC
OR
25VDC
N
L
LOAD
230VAC
OR
25VDC
N
L
Warning: To protect the module and associated wiring from load faults, use external (5A) fuse(s) as
shown. Fuses of lower current or fusing for the entire system need to be in place to assure the
maximum current rating of the unit is not exceeded.
Warning: Connecting high voltage to any I/O pin can cause high voltage to appear at other I/O pins.
Figure 8.5
–
Relay Fusing