Installation guide

Commissioning
890USE17100 September 2003 83
Power
Connections
There are at least three power connections to be made to your island from your
source power supply or supplies:
24 VDC to the NIM logic power input
24 VDC, 115 VAC, or 230 VAC to the actuator power input of the first PDM
24 VDC, 115 VAC, or 230 VAC to the sensor power input of the first PDM
Power to these receptacles can be supplied by the same power supply (delivered in
parallel) or by independent power supplies. In general, we recommend using two
supplies, one for the logic power to the NIM and one for field power (sensors and
actuators). The power supplies you use should be SELV rated. Your design decision
should be based primarily on current needs and capabilities. These supplies can be
mounted on the same DIN rail as part of the island or mounted separately. They are
generally enclosed in the same EIA rated enclosure that your island is in. To make
the connection simply push your power connectors into their matching receptacles.
The DC power distribution modules (PDMs) are designed with reverse polarity
protection. This will help prevent damage to the DC modules and protect them from
possible unexpected field operation. However, this is only intended as a temporary
protection during commisioning of the island.
Here is an independent power scheme for an Advantys STB island using two power
supplies.
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Power
Supply
Power
Supply