TRENDnet BE1-87G - Manual (Page 17)

3-4 BE1-87G - Functional Description
supply status output relay continually energized and its output contacts open. If the power supply output voltage
falls below the requirements for proper operation, the power supply status output relay de-energizes, closing the
NC output contacts.
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 L 24 Vdc 12† to 32 Vdc
Mid Range J, K, Y 48, 125 Vdc,
120 Vac 24 to 150 Vdc
90 to 132 Vac
High Range Z 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. Nominal +12 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.