Installation guide

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Cooper Bussmann BU-905U-L Wireless I/O Configuration Manual
7. Enter the new value:
Fill the cold-junction table with the millivolt output of the thermocouple corresponding to each 10-degree temperature increment.
Your thermocouple documentation should contain this information.
The Linearization table lets you enter up to 51 data points relating the thermocouple voltage to the desired output value.
You can enter the desired output value either as a milliamp value (range 0-20mA) or as a raw 16-bit unsigned value.
Refer to Appendix A – Tables for translating different analog signal types on page 75 for more information.
NOTE: - You must enter the millivolt input values in ascending order; with the lowest millivolt value entered into entry 1, and the
highest in the last used entry.
- Unused entries should be set to “100” millivolts.
8. BU-Config writes the new thermocouple tables and settings to the module when you next configure the module.
Setting Additional Unit Detail Information
This section describes how to set additional unit detail information including:
• Sample period and warmup time - the BU-905U-L-T only turns on the analog circuits and the +24V analog loop power supply when they are
actually required. You can reduce the module power consumption by limiting the amount of time the analog circuitry and the +24V analog loop
supply is enabled.
Sample period determines how often the module checks an analog signal. Warmup time determines how long the analog circuits are powered
up before performing the sample. The analogue circuitry is powered all the time if the warmup period for any analog input is set to a value
longer than the sampling period.
By setting the sample time as long as possible, and setting the warmup time as short as necessary to power the external conditioning circuitry,
the module power consumption can be reduced; and
• Debounce time - the amount of time an input needs to have differed from its previous value before it is recognized as having changed.
This helps with noisy signals.
Inputs subject to a high level of noise can cause the module to transmit multiple messages due to random changes to the input level.
By setting the debounce time to a larger value, the signal needs to change by the configured sensitivity for some time before a
change is registered and a new message is sent.
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