Woodward 9907-696 LQ25 Standard Valves

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.

The overspeed test function is activated when the key switch is in the

PROGRAM position and the operator presses and holds the OVSP TEST button

on the touch pad. The microcontroller switches the source of the MPU signal

from the MPU input to an on-board oscillator. The test speed is annunciated on

the LCD. If the test speed is adjusted above the trip setpoint, using the Test

Frequency potentiometer on each unit, a trip occurs. MPU loss-of-signal

checking is disabled, and the peak speed value does not change during

overspeed test. When the OVSP TEST button is released, the microcontroller

switches the source of the MPU signal back to MPU input and normal operation

is restored. Each ProTech unit must be reset to clear its trip condition.