Installation guide

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Cooper Bussmann BU-905U-L Wireless I/O Configuration Manual
Receiver (BU-905U-L-R)
The receiver receives messages and updates its outputs according to the radio messages.
When the module receives a radio message, the yellow LED on the front panel flashes.
The receiver provides one analog output (4-20mA), and three discrete relay outputs. The receiver also provides two status outputs, indicating
module OK and communication failure.
Module OK Output
The module OK output remains on while the module is running and its system status indicates the system is working correctly. The LED marked
OK on the front panel is green when the system is working correctly and red otherwise.
Communication Failure Output
The communication failure output turns on when the BU-905U-L-R receiver does not receive a message within a user-configured time. Each out-
put has a “comms-fail” timer that resets each time it receives a radio message for the output. If the timer associated with any of the outputs
reaches the configured timeout value (i.e., indicating no message was received in the user-configured time) the communications failure output is
set on. The LED on the front panel marked CF also indicates a communication failure.
Front Panel Indicators
Each output has an indication LED on the front panel of the module indicating the status of the output. Each of the three discrete outputs also has
an associated green LED that turns on when the output is on. The analog output has an associated red LED (marked AZ) that turns on when the
analog signal is zero.
The receiver sets each output according to the value specified in the messages it receives. The unit also records the time of the most recent
received message that addresses each output. If no message is received within the configured timeout for the output, the receiver indicates a
communications failure for the output. When an output is in communications failure, the associated LED flashes quickly and the module
communication failure output turns on to indicate a fault. The LED associated with the analog output for the purposes of indicating communication
failure is marked PG on the front panel.
The receiver also records the signal strength of messages it receives. Pressing the button on the front panel of the receiver causes the LEDs to
light up showing a bar graph of the signal strength of the last received message; red indicates poor signal, yellow indicates marginal signal, and
green indicates a good signal.
3A1579Rev1.4