Creation:03.09 — 2009 1-1-10
Description
(9) Engine Cooldown Timer Module, K7
The purpose of the Engine Cooldown Timer Module is to perform the acutal timing of the
Engine Cooldown Circuit. When the engine is running and the ignition switch is moved to the
off position, power is cut ot the “initiate” contact of this relay. One minute after, this relay will
go back to it’s original state and cut power to the 24 VDC run circuit, cutting power to the
engine’s ECM and shutting off the unit.
On startup, there is no timing feature.
(10) Frequency Simulator Switch, S4
The frequency Simulator Switch is a single-pole, double-throw, switch with momentary
contacts used for maintenance purposes only. It functions to increase or decrease the
engine’s speed by sending a signal to the appropriate contact on the engine’s ECM. When the
engine’s speed is increased, the generator’s output frequency is also increased, and visa versa.
This switch is used to ensure the generator control module (GCM) causes the output
contactor(s) to open anytime the frequency goes over 420 Hz or falls under 380 Hz.
(11) Bridge Rectifier, CR1
The function of the bridge rectifier(s) is to convert a 115 VAC signal to 28 VDC to energize the
unit’s main output load contactor(s).
(12) Terminal Boards, TB1, TB2, TB3, TB4, TB5
The purpose of the terminal boards is to provide a means to interconnect power from 1 wire or
cable to another. TB5 is for connecting the 400 Hz output cable(s) Neutral wire “N” to the
Generator “N” cable. TB6 connect the output cable(s) E and F pins to the K11 output plug
interlock relay coil. TB9 is to allow connecting of the optional 28.5 VDC circuit.
Note that there is no Terminal Board for connecting output cable(s) for lines A, B, or C. These
are connected directly into the output contactor(s) respective contact.
(13) Spare Relay
The purpose of the Spare Relay is disconnected and provides to replace any of the failure
relays (for K4, K5, K6, K8 & K11).
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