Manual 26815 QuickTrip Electro-Hydraulic Trip Block Assembly
Woodward 28
The input power wires must comply with local code requirements and be of sufficient size such that the
power supply voltage minus the IR loss in the two lead wires to the QuickTrip valve electronics module
does not drop below the input minimum voltage requirement.
The QuickTrip is not equipped with an input power disconnect. A means of disconnecting input power to
the QuickTrip must be provided for safe installation and servicing.
The QuickTrip is not equipped with input power protection. A means of protecting input power to the
QuickTrip must be provided. Breakers or fuses are intended to protect installation wiring and power
sources from faults in the QuickTrip or wiring. A circuit breaker meeting the requirements from the table
below, or a separate protection with the appropriate ratings, may be used for this purpose.
Refer to the table below for recommended fuse ratings or circuit breakers.
Table 3-2. Recommended Circuit Breaker Fuse Ratings
Component Input Voltage
Steady State
Input Current
(per module)
Maximum
Transient
Input Current
(all modules)
Maximum
Power
Maximum Slow
Blow Fuse / C.B.
Rating
QuickTrip
(21.6-26.4) Vdc
24 Vdc nominal
2.6 A @ 24
Vdc
10 A
280 W
(100 ms)
20% above
Steady State
Current
Figure 3-3. Power Supply Input Connections
The QuickTrip is capable of connecting two redundant power supplies to each valve electronics module.
The following table presents terminal assignment for this option usage.
Table 3-3. Power Supply Input Terminals
Power Input (+) Power Input (-)
Power Supply #1 Terminal # 2 Terminal # 1
Power Supply #2 Terminal # 4 Terminal # 3
If redundancy option is not used, both (+) signals (Termi
Terminal #4) should be connected together at the terminal.
Although the QuickTrip is protected against input voltage transients, good wiring practices must be
followed. The following drawings illustrate correct and incorrect wiring methods to the power supply.
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