Manual 26166V1 MicroNet Simplex & MicroNet Plus
Woodward 41
Chapter 5.
Power Supplies
5.1—MicroNet Plus Chassis Power Supplies
5.1.1—Module Description
The MicroNet Plus Simplex or Redundant controls may use either single or redundant power supplies.
Each power supply module produces three regulated outputs: 24 V @ 12 A (max), 5 V @ 32 A (max,
derated above 55 degree C external ambient temperature), and 5 V Pre-charge @ 3 A (max). A
motherboard located on the back of the chassis provides the interconnection of the three outputs from
each power supply module into three corresponding power busses: 24 V bus, 5 V bus, and 5 V pre-
charge bus. The 24 V and 5 V busses are load shared between the two power supply modules. The 5 V
pre-charge bus is not load shared. Power output regulation at the motherboard, including line, load, and
temperature effects, is less than ±10% for the 24 V bus, +/-5% for the 5 V bus, and +/-10% for the 5 V
Pre-charge bus. The 5 V and 5 V Pre-charge busses are not for external use. The 24 V bus is accessible
from the motherboard for external use (protected by 5 A fuses on the source and return lines).
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 on supply needs to be replaced, the
recommended method for changing Power Modules is with the power off (to the module being removed
and the module being inserted). The system will tolerate this “cold swap” method without failure.
Each main power supply has four LEDs to indicate power supply health (OK, Input Fault,
Overtemperature, and Power Supply Fault). See MicroNet Plus Power Supply Troubleshooting (Section
5.5) for a description of the LED indications.
Input power connections are made to the power supply through a plug/header assembly 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 PS1 (power supply #1) and PS2 (power supply #2). If
redundant power supplies are not needed, blanking plates must be installed in the slots not being used.
For MicroNet Plus Simplex installation instructions, see Chapter 15 (Installation).
The MicroNet Plus 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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