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Cooper Bussmann BU-905U-L Wireless I/O Installation Manual
I
NPUTS AND OUTPUTS
The units have the following inputs and outputs:
Input/Output
BU-905U-L-T
BU-905U-L-R
Description
For more information, see …
Digital inputs
2
Suitable for Voltage free contact,
Digital inputs on page 15.
NPN transistor, 0-5V signal.
Relay outputs
3
250Vac 1A / 30Vdc 1A.
Relay outputs Important
Information on page 17.
Status outputs
2
2
Max 30Vdc, 500mA. Indicate module status,
Status outputs on page 18.
communication failure and local setpoint status.
Analog inputs
1
4-20mA with over-range and under-range.
Analog input on page 18.
0-10mA with over-range.
+24V Loop supply 1
Provides power for 1 external current loop
Installing the power supply
(up to 35mA).
on page 14.
Analog setpoint
1
Allows discrete setpoint to be controlled from
Refer to the User Manual.
analog input. Threshold adjustable via
rotary switch.
Thermocouple /
1
Provides measurement of E, J, K, T type
Thermocouple input
millivolt input
Thermocouple, millivolt signals and user-defined on page 20.
thermocouple types.
Thermocouple
1
Lets you control discrete setpoint from
Refer to the User Manual.
Setpoint
thermocouple with threshold adjustable via
rotary switch.
Pulse inputs
2
Up to 10Hz.
Pulse input on page 21.
Analog Output
1
0-22mA, suitable for loop powered, floating
Analog output
input or single-ended input device.
on page 22.
For more information, see the next sections.
Digital Inputs
The BU-905U-L-T module provides two digital inputs suitable for:
• Voltage free contacts – e.g., mechanical switches; or
• NPN Transistor devices – e.g., electronic proximity switches; or
• 0-5V Signals - 2V – 4V Minimum range.
Note: PNP Transistor devices are not suitable.
15
3A1580Rev1.7
