Basler Electric BE1-11g - Manual (Page 45)

9424200994 Rev N 33
Contact Inputs and Outputs
BE1-11g Generator Protection Systems provide up to seven 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 seven contact inputs to initiate BE1-11g actions. 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 IN4 (H or P type case) or IN1 through IN7 (J type case). 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
Note
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.
Table 5. Contact-Sensing Turn-On Voltages
Style Option Nominal Input Voltage
Contact Sensing Turn-On Voltage
*
Jumper Installed
(Low Position)
Jumper Not Installed
(High Position)
Gxx1xxxxxxxxxx 48 Vdc or 125 Vac/dc 26 to 38 Vdc 69 to 100 Vdc
56 to 97 Vac
Gxx2xxxxxxxxxx 125/250 Vac/dc 69 to 100 Vdc
56 to 97 Vac
138 to 200 Vdc
112 to 194 Vac
Gxx3xxxxxxxxxx 24 Vdc n/a Approx. 5 Vdc
* 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 Contact Inputs and Outputs