Manual 26166V1 MicroNet Simplex & MicroNet Plus
Woodward 46
5.2—Simplex Expansion Power Supplies
5.2.1—Module Description
The MicroNet Simplex control may use either single or redundant power supplies. A motherboard located
on the back of the chassis allows the two power supplies to form a redundant power system providing two
separately regulated, 24 Vdc, 12 A outputs; two separately regulated, 5 Vdc, 20 A outputs; and two
separately regulated, 5 Vdc pre-charge outputs to the control. Power output regulation, including line,
load, and temperature effects, is less than ±5%.
When redundant power supplies are running, current sharing circuitry balances the load to reduce heat
and improve the reliability of the power supplies. In the event that one supply needs replacement, this
feature also ensures hot replacement of the power supplies without disrupting the operation of the control.
Each main power supply has four LEDs to indicate power supply health (OK, Input Fault,
Overtemperature, and Power Supply Fault). See MicroNet Simplex Power Supply Troubleshooting
(Section 5.5) for a description of the LED indications.
Input power connections are made to the power supply through terminals on the front of the power
supply.
For redundant operation, the control can use any combination of power supplies.
The power supplies can only be installed into slots PA1 (power supply #1) and PA2 (power supply #2). If
redundant power supplies are not needed, blanking plates (3799-301) must be installed in the slots not
being used.
For MicroNet Simplex installation instructions, see Chapter 15 (Installation) and Section 5.3 of this
chapter.
The MicroNet Simplex main power supplies must have the input
power removed before installing or removing.
This equipment is suitable for use in Class I, Division 2, Groups A, B,
C, and D or non-hazardous locations only.
Wiring must be in accordance with Class I, Division 2 wiring methods
and in accordance with the authority having jurisdiction.
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