WebRelay Users Manual
2.2 Making Connections
CAUTION: Make sure the power is shut off before making connections
CAUTION: This unit should be installed by a qualified technician.
CAUTION: Miswiring or misconfiguration could cause permanent damage to the WebRelay, the
equipment to which it is connected, or both.
A removable terminal connector is provided for making the power connections. To help protect the
WebRelay from mechanical stress, remove the terminal connector before making the connections.
1.
Make sure power is turned off.
2.
Remove the terminal connector from the WebRelay and make wiring connections to the
terminals. This technique avoids stressing the internal components while torquing the screws.
3.
Reconnect the terminal connector.
4.
Apply power.
It is recommended that any load (device to be controlled) not be connected until after the WebRelay has
been configured and tested. By doing this, wiring and configuration mistakes will not cause the load
device to turn on unexpectedly. Make certain the wires are properly inserted into to the terminals and
that the screws are tight.
See
Appendix D: Specifications
for wire size, temperature rating and torque requirements for making
connections to the terminal blocks.
2.2.1 Power Supply Connections
The WebRelay requires power for its internal logic circuits. Connect a 9-28 VDC power supply to the
+Vin and Vin- (Gnd) terminals. A regulated power supply is recommended, such as a wall-mount AC-DC
adapter. Verify that the adapter is rated for the operating current of the WebRelay (See
Appendix D:
Specifications
for the current requirements.) Multiple WebRelay units may be connected to a single
power supply by connecting the power supply input terminals in parallel. The power supply must have a
high enough current rating to power all units connected.
The model X-WR-1R12-1I-E is normally powered from an 802.3af compliant Power Sourcing Equipment
(PSE) device which passes DC power, along with data on the twisted-pair Ethernet cabling. This allows
a single cable to provide both the data connection and DC power. With the X-WR-1R12-1I-E no
connections are needed to the Vin+ and Vin- terminals. The Vin+ and Vin- terminals however, can be
used as a backup power source. The WebRelay has an internal “diode or” circuit between the Vin+
terminal and the internal Powered Device (PD) circuits. If a power supply is connected to the Vin+
terminal, the WebRelay will draw power from the PSE if the input voltage is less than 12.0V, and from
the Vin+ terminal if the input voltage is greater than 12.0V. If the PSE power fails, the WebRelay will
draw all power from the Vin+ terminal.
Note: the X-WR-1R12-1I5-E power-over-ethernet module does not support 9-28VDC as a backup power
source on the Vin+ and Vin- terminals. This POE model is powered from the power sourcing equipment
or optionally via +5V applied to the Vin+ terminal (but not both.)
Xytronix Research & Design, Inc.
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