3-4
BE1-47N Functional Description
POWER SUPPLY
Basler Electric enhanced the power supply design for unit case relays. This new design created three, wide
range power supplies that replace the five previous power supplies. Style number identifiers for these power
supplies have not been changed so that customers may order the same style numbers that they ordered
previously. The first newly designed power supplies were installed in unit case relays with EIA date codes
9638 (third week of September 1996). Relays with a serial number that consists of one alpha character
followed by eight numerical characters also have the new wide range power supplies. A benefit of this new
design increases the power supply operating ranges such that the 48/125 volt selector is no longer
necessary. Specific voltage ranges for the three new power supplies and a cross reference to the style
number identifiers are shown in the following table.
Table 3-1. Wide Range Power Supply Voltage Ranges
Power Supply
Style Chart Identifier
Nominal Voltage
Voltage Range
Low Range
R
24 Vdc
12† to 32 Vdc
Mid Range
O, P, S
48, 125 Vdc,
120 Vac
24 to 150 Vdc
90 to 132 Vac
High Range
T
125, 250 Vdc,
120, 240 Vac
62 to 280 Vdc
90 to 270 Vac
† 14 Vdc required to start the power supply.
Relay operating power is developed by the wide range, isolated, low burden, flyback switching, solid state
power supply. N12 Vdc is delivered to the relay internal circuitry. Input (source voltage) for the
power supply is not polarity sensitive. A red LED turns ON to indicate that the power supply is functioning
properly.
POWER SUPPLY STATUS OUTPUT
The power supply status output is a standard feature of the BE1-47N relay. The power supply status output
relay has a set of normally closed (NC) contacts that are energized open upon power-up and remain open
during proper power supply operation. If either or both of the power supply output legs (+12V or -12V) drops
out, the power supply status output relay is de-energized (contact closed).
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