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The STB NIP 2212 NIM
890USE17700 April 2004 41
The extended island bus contains three built-in power supplies:
the supply built into the NIM, which resides in the leftmost location of the primary
segment
a power supply built into each of the STB XBE 1200 BOS extension modules,
which reside in the leftmost location of the two extension segments
In the figure, the external supply would provide 13 W of power for the NIM plus 13 W
for each of the two BOS modules in the extension segments (for a total of 39 W).
Suggested
Devices
The external power supply is generally enclosed in the same cabinet as the island.
Usually the external power supply is a DIN rail-mountable unit.
For installations that require 72 W or less from a 24 VDC source power supply, we
recommend a device such as the ABL7 RE2403 Phaseo power supply from
Telemecanique, distributed in the United States by Square D. This supply is DIN rail-
mountable and has a form factor similar to that of the island modules.
If you have room in your cabinet and your 24 VDC power requirements are greater
than 72 W, summable power supply options such as Schneider’s Premium
TSX SUP 1011 (26 W), TSX SUP 1021 (53 W), TSX SUP 1051 (120 W), or
TSX SUP 1101 (240 W) can be considered. These modules are also available from
Telemecanique and, in the United States, from Square D.
Note: If the 24 VDC source power supply also supplies field voltage to a power
distribution module (PDM), you must add the field load to your wattage calculation.
For 24 VDC loads, the calculation is simply amps x volts = watts.