Contact Inputs And Outputs; Contact-Sensing Inputs - Basler BE1-11g Instruction Manual

9424200994 Rev U

Contact Inputs and Outputs

BE1-11g Generator Protection Systems provide up to 10 contact inputs, up to eight general-purpose
contact outputs, and one dedicated fail-safe alarm contact output. Each input and output is isolated and
terminated at separate terminals. This section describes the function and setup of each input and output.

Contact-Sensing Inputs

A BE1-11g in a J type case has either seven or 10 contact inputs to initiate BE1-11g actions. Refer to the
style chart for I/O options. Four contact inputs are provided in an H or P type case. Each isolated input
requires an external wetting voltage. The nominal voltage(s) of the external dc source(s) must fall within
the BE1-11g dc power supply input voltage range. To enhance user flexibility, the BE1-11g protection
system uses wide-range ac/dc power supplies that cover several common control voltage ratings. To
enhance flexibility, the input circuits are designed to respond to voltages at the lower end of the control
voltage range while not overheating at the high end of the control voltage range.
The contact input circuits are polarity sensitive. When an ac wetting voltage is applied, the input signal is
half-wave rectified by the opto-isolator diodes. The contact inputs drive BESTlogic™Plus variables IN1
through IN10. Each contact input is completely programmable so meaningful labels can be assigned to
each input and the logic-high and logic-low states. The BESTlogicPlus chapter provides more information
about using contact inputs in your programmable logic scheme.
Contact-Sensing Input Jumpers
The BE1-11g protection system is delivered with the jumpers in the
HIGH position. Read the following paragraphs before placing the BE1-
11g in service.
Energizing levels for the contact-sensing inputs are jumper selectable for a minimum of approximately 5
Vdc for 24 Vdc nominal sensing voltages, 26 Vdc for 48 Vdc nominal sensing voltages, or 69 Vdc for 125
Vdc nominal sensing voltages. See Table 5 for the contact-sensing turn-on voltages.
Style Option
Gxx1xxxxxxxxxx
Gxx2xxxxxxxxxx
Gxx3xxxxxxxxxx
* AC voltage ranges are calculated using the default recognition time (4 ms) and debounce time (16 ms).
Each BE1-11g is delivered with the contact-sensing jumpers disconnected for operation in the higher end
of the control voltage range. If the contact-sensing inputs are to be operated at the lower end of the
control voltage range, the jumpers must be installed.
Contact-Sensing Jumper Configuration in a J Type Case
The following paragraphs describe how to locate and remove/change the contact-sensing input jumpers:
BE1-11g
Table 5. Contact-Sensing Turn-On Voltages
Nominal Input Voltage
48 Vdc or 125 Vac/dc
125/250 Vac/dc
24 Vdc
Note
Contact Sensing Turn-On Voltage *
Jumper Installed
(Low Position)
26 to 38 Vdc
69 to 100 Vdc
56 to 97 Vac
n/a
Jumper Not Installed
(High Position)
69 to 100 Vdc
56 to 97 Vac
138 to 200 Vdc
112 to 194 Vac
Approx. 5 Vdc
Contact Inputs and Outputs
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