Manual 26166V1 MicroNet Simplex & MicroNet Plus
Woodward 50
Power requirements depend on the number and type of modules supplied for each system. For a system
with a single I/O chassis, size the input power source according to the rating of the MicroNet power
supply to which the source is connected. Do not size the supply mains for the sum of the MicroNet power
supply ratings when redundant supplies are used. MicroNet supplies are redundant when installed in the
same chassis. Redundant supplies share the load between them equally, but each must provide for full
load in the event that one of the units is disabled. Table 5-2 gives the maximum overload protection for
supply mains connected to any single or redundant pair of MicroNet main power supplies. It is not
recommended that both MicroNet main power supplies of a redundant pair be connected to a single
source, since failure of that source would disable the system.
Multiple chassis systems using MicroNet power supplies may have power supplies of the same model,
but in different chassis, connected to the same source. In this case, each branch to a chassis must have
its own overcurrent protection sized according to Table 5-2, and the power source must be sized for the
sum of the branches.
Not all systems will require the full load capability of the MicroNet power supply. If not otherwise indicated
on a cabinet system nameplate, either use the MicroNet power supply input ratings for sizing the system’s
source or consult Woodward for determining the minimum source requirements.
Table 5-2 provides each power supply’s holdup time specification, which is the time the supply will
continue to operate within specification after its input power is interrupted. This information may be useful
in specifying uninterruptible power supply (UPS) systems.
Table 5-6. MicroNet Simplex Power Supply Requirements
MAXIMUM
INPUT VOLTAGE
RANGE
MAXIMUM FUSE/
C.B. RATING
(Time Delay)
WIRE SIZE **
(AWG/mm²)
18–36 Vdc 50 A 8 / 10 *
100–150 Vdc 10 A 14 / 2.5
88–132 Vac 47–63 Hz 20 A 12 / 4
200–300 Vdc 5 A 16 / 1.5
180–264 Vac 47–63 Hz 10 A 14 / 2.5
* must use wire rated for at least 75 °C for use at 30 °C ambient
** except as noted, wire sizes are rated 60 °C for 30 °C ambient
When a cabinet is not supplied with the system, input power connections are made through terminals on
the front of each main power supply. These terminals accept wires from 0.5 to 10 mm² (20–8 AWG). For a
good connection, the inserted wires should have the insulation stripped back 8–9 mm (0.33 in). Torque to
0.5 to 0.6 Nm (0.37 to 0.44 lb-ft).
The 24 Vdc power supply model uses larger copper input terminals to accommodate the required 10 mm²
(8 AWG) wire.
A green/yellow wire connection of at least the same size as the supply wire must be used for the PE
ground.
5.4.2—System Power-Up
If at any time during this procedure the defined or expected result is not achieved, begin system
troubleshooting.
1. Verify that the entire MicroNet control system has been installed.
2. Turn on the power to one power supply and verify that the power supply’s green LED is the only
power supply LED on.
3. Turn off the power to the first power supply and turn on the power to the second power supply (if a
second power supply is present) and verify that the power supply’s green LED is the only power
supply LED on.
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