Basler Electric BE1-851 - Manual (Page 46)

Figure 3-3. General Operation Screen, Power System Tab
Contact-Sensing Inputs
BE1-851 relays have four contact-sensing inputs to initiate BE1-851 relay actions. These inputs are
isolated and require an external wetting voltage. Nominal voltage(s) of the external dc source(s) must fall
within the relay dc power supply input voltage range. To enhance user flexibility, the BE1-851 relay uses
wide range ac/dc power supplies that cover several common control voltage ratings. To further 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.
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 3-2 for the contact-sensing turn-on voltages.
Table 3-2. Contact-Sensing Turn-On Voltages
Style Option Nominal Input Voltage
Contact-Sensing Turn-On Voltage *
Jumper Installed
(Low Position)
Jumper Not Installed
(High Position)
xxx1xxx 48 Vdc or 125 Vac/dc 26 to 38 Vdc
69 to 100 Vdc
56 to 97 Vac
xxx2xxx 125/250 Vac/dc
69 to 100 Vdc
56 to 97 Vac
138 to 200 Vdc
112 to 194 Vac
xxx3xxx 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 BE1-851 is delivered without the contact-sensing jumpers installed 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. See Section 12, Installation, for details on how to set the
jumper positions in the contact-sensing input circuits.
3-4 BE1-851 Input and Output Functions 9289900990 Rev R