Installation
DC relays - use flyback diodes across the external circuit to prevent arcing across the
relay contacts.
2.3.2 Relay outputs
The WL-RX-900 module provides three normally open voltage-free relay contacts
rated at 250VAC / 30VDC 1A.
You can use these outputs to directly control low-powered equipment or power larger
relays for higher-powered equipment.
For inductive loads - use flyback diodes across the external circuit to prevent
arcing across the relay contacts.
If you are using the output to operate an AC relay or contactor, you must use
suitable capacitors to prevent arcing across the relay contacts.
You can individually configure digital outputs to turn off if no command message is
received by the output for a certain period. This feature provides an intelligent
watchdog for each output, so communications failure at a transmitting site causes the
output to revert to a known state.
The output circuit is connected to the appropriate pair of Digital Output terminals. Each
digital output circuit includes a LED indicator that lights when the digital output is
active. The LED flashes if the watchdog alarm is active.
AC relays – use capacitors (e.g. 10nf 250V) to prevent arcing across the relay
contacts.
ATTENTION
ATTENTION
DC
Load
Max 30VDC 1A
AC
Load
10nF
250V
Max 250VAC 1A
22
