Manual 26166V1 MicroNet Simplex & MicroNet Plus
Woodward 49
5.4—Installation
Figure 5-3. MicroNet Power Supply
5.4.1—Input Power Wiring
MicroNet controls require a fixed wiring installation for ac applications. Ground leakage exceeds 3.5 mA
ac. Maximum ground leakage for ac installations is 7.2 mA at 60 Hz. A ground conductor connected to
the chassis is required for safety. The power supply grounding terminal(s) should also be connected to
earth to ensure grounding of the power supply printed circuit boards. The grounding conductor must be
the same size as the main supply conductors.
Note that the control’s power supplies are not equipped with input
power switches. For this reason, some means of disconnecting input
power to each main power supply must be provided for installation and
servicing. A circuit breaker meeting the above requirements or a
separate switch with appropriate ratings may be used for this purpose.
To avoid nuisance trips, use only time-delay fuses or circuit breakers.
Branch circuit fuses, circuit breakers, and wiring must meet appropriate codes and authorities having
jurisdiction for the specific country (CE, UL, etc.). See Table 5-2 for maximum recommended fuse or
breaker ratings. Do not connect more than one main power supply to any one fuse or circuit breaker. Use
only the wire sizes specified in Table 5-6 which meet local code requirements. Time delay fuses or circuit
breakers must be used to prevent nuisance trips.
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