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Cooper Bussmann BU-905U-L Wireless I/O Installation Manual
U
NIT
S
PECIFICATIONS
This section details the specifications for each unit.
Transmitter Unit
Input/output
Number
Additional information
Digital Inputs
2
Dry-contact digital inputs slow-pulsed at 10Hz.
All inputs are suitable for voltage free contacts (e.g. mechanical switches) or
NPN transistor devices (e.g. electronic proximity switches).
NOTE: PNP transistor device inputs are NOT suitable.
Status Outputs
2
Separate System OK and Setpoint Status
Analog Inputs
1
0-20mA differential input; 16-bit resolution, 0.1% accuracy, 10 ohm input impedance.
Thermocouple Inputs
1
J, K or T Type thermocouple with on-board cold-junction compensation.
Cold junction compensation accuracy ±1º over ambient temp range: -40º to +70ºC.
Power Supply
1
9-30Vdc 0.6 Amp CSA certified Class 2 power supply. For use in Class I Div 2 hazardous
locations, the power supply must be approved for Class 1 Div 2 use.
WARNING:
Explosion hazard - do not disconnect while circuit is live unless area is
known to be non-hazardous.
Transmitter
1
1-Watt Frequency Hopping Spread Spectrum (FHSS) Transmitter.
Frequency
902-928 MHz
Actual frequency range depends on country.
Receiver Unit
Input/output
Number
Additional information
Digital outputs
3
Voltage-free contacts rated at 250Vac, 1A, 30Vdc 1A 2 for digital inputs and 1 for setpoint.
Status outputs
2
Separate System OK and communication failure output.
Analog output
1
16-bit resolution, 0.1% accuracy, single-ended source output.
Power supply
1
9-30Vdc 0.25 Amp CSA certified Class 2 power supply. For use in Class I Div 2 Hazardous
locations, the power supply must be approved for Class 1 Div 2 use.
WARNING:
Explosion hazard - do not disconnect while circuit is live unless area is
known to be non-hazardous.
Radio receiver
1
High sensitivity FHSS UHF radio receiver.
Frequency
902-928 MHz
Actual frequency range depends on country.
Sensitivity
-110 dBm
At PER 8%.
3A1580Rev1.7
