Woodward QuickTrip Electro-Hydraulic Trip Block Assembly Extended Power Input

Voltage Drop Calculation Using American Wire Gauge

Example #1. one power supply per module (3x power supplies): A 18 AWG wire will drop 0.042 V/ft at 2.6

A at maximum ambient temperature. Using 100 feet between the QuickTrip and the power supply would

provide a voltage drop of 100x0.042 = 4.2V.

Example #2. one power supply for all three modules (1x power supply): A 18 AWG wire will drop 0.125 V/ft

at 7.8 A at maximum ambient temperature. Using 100 feet between the QuickTrip and the power supply

would provide a voltage drop of 100x0.125 = 12.5V.

It is very important to ensure the voltage at the QuickTrip’s input terminal is within the product power input

specification to achieve maximum performance.

Wire Cross-Sectional Area Voltage Drop

A standard wire cross-sectional area voltage drop at maximum ambient temperature is provided in Table

3-6 and Table 3-7 to assist with cable selection.

Example of Voltage Drop Calculation Using Wire Cross-Sectional Area

0.067

Example #1. one power supply per module (3x power supplies): A 2.5mm2 wire will drop 0.044 V/m at 2.6 A at

maximum ambient temperature. Using 30m between the QuickTrip and the power supply would provide a

voltage drop of 30 x 0.044 = 1.32V.

Example #2. one power supply for all three modules (1x power supply): A 2.5mm2 wires will drop 0.132 V/m

at 7.8 A at maximum ambient temperature. Using 30m between the QuickTrip and the power supply would

provide a voltage drop of 30 x 0.132 = 3.96V.

It is very important to ensure the voltage at the QuickTrip’s input terminal is within the product power input

specification to achieve the maximum performance.

A guideline for allowable voltage drop is to size the wire for <10% of the nominal voltage under maximum

transient conditions.

Extended Power Input

The Power Wiring Requirements section above specifies the maximum length of 30 meters between the

power source and the QuickTrip. Installations that require a longer power cable run also require a much

larger wire gauge to account for voltage drop. Figure 3-6 below gives a possible solution for installations

required to run at longer distances.