Woodward 8528-325 UG25+ Actuators

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.

Branch circuit fuses, circuit breakers, and wiring must meet appropriate codes and authorities having

jurisdiction for the specific country (CE, UL, etc.). See Table 4-4 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 4-4 which meet local code requirements. Time delay fuses or circuit

breakers must be used to prevent nuisance trips.

An MPU loss-of-signal occurs when an MPU frequency of less than 100 Hz is

measured and the previously measured speed was greater than 120 Hz. The

alarm relay de-energizes, and the MPU FAIL LED turns on and remains on until

a reset or until power is cycled. If the TRIP ON MPU FAILURE option is "yes", a

trip occurs. If the previously measured speed is less than 120 Hz, it is assumed

that a normal rolldown has occurred. The MPU FAIL LED does not turn on, the

alarm relay does not de-energize, and no trip occurs.

After a normal rolldown, each ProTech unit monitors the MPU. If the MPU

frequency exceeds 110 Hz, the unit trips and annunciates the cause as NO RESET.

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