The purpose of the Automatic Circuit Controller is to prevent any attempts of the Startix to engage the Starter just as the Engine is rocking backwards when it is coming to a stop due to misfire or false start. The Automatic Circuit Controller is equipped with a pair of normally closed contacts that are forced open by a pressure sensitive diaphragm when the Engine rolls back during a false start. These contacts are in series with the Startix Control Circuit and prevent the Starter engaging the ring gear under such conditions. The Starter is of a Bendix type and equipped with a Folo-thru drive to prevent kicking out during starting.

CRANKING TIME LIMITOR

The purpose of the Cranking Time Limitor is to prevent discharge of the Battery or damage to the Starter. When Remote, Local or Manual Ignition Switch is moved to "ON" position cranking of the Siren Engine begins. If for some reason the Engine should refuse to start, the Cranking Time Limitor automatically limits the Cranking Cycle to about 35 seconds. At the end of that time, a Thermostatic switch in the Limitor is tripped, this switch is in series with the Startix Control Circuit and Cranking stops. The Cranking Time Limitor's Automatic Mechanism must be manually reset by pushing the reset button on the side of the case before another start is possible.

GENERATOR RELAY "H"

The purpose of the Generator Relay "H" is to keep the Penn Switch and the Throttle Relay "G", electrically inoperative when the Engine is stopped and during the cranking cycle. And to supply a Battery feed to the Penn Switch and Throttle Relay "G" after the Engine has started running. The Generator Relay "H" is energized by the Generator when the Engine has started and has come up to 400 R.P.M.

IGNITION CUT-OUT RELAY "E"

The purpose of the Ignition Cut-Out Relay "E" is to stop the Engine when a Battery feed is supplied by the Overspeed Governor or the Penn Pressure-Temperature Switch. Should a pressure, temperature or speed failure occur, a Battery feed is supplied to Ignition Cut-Out Relay "E", BAT terminal, energizing relay.

Through the relays INT-PRI contacts, the Engine Ignition Coil is grounded, stopping Engine.

Once the Ignition Cut-Out Relay "E" is energized, it will become self-energized through its own SOL contact until the circuit is broken by turning the Ignition switch "OFF" at the Remote, Local or Manual Station (which ever one was used to start siren). Thus allowing Operator to make any necessary corrections before damage could result.

After any such corrections are made, the Engine may be restarted by turning the Ignition switch back "ON". The Ignition Cut-Out Relay "E" is equipped with a 30 ampere fuse.

IGNITION RELAY "F"

The purpose of the Ignition Relay "F" is to supply a Battery feed to the Ignition Cut-Out Relay "E", Generator Relay "H", Overspeed Governor and the Engine Ignition Coil. To and through the Cranking Time Limitor, through the Automatic Circuit Controller to energize the Startix. Ignition Relay "F" is equipped with a 20 ampere fuse.

OVERSPEED GOVERNOR

The purpose of the Overspeed Governor is to stop the Engine should Engine speed exceed about 4700 R. P. M. The Overspeed Governor is a centrifugal type, and is Engine driven by a belt from the crankshaft pulle

It provides continuous protection, starting as soon and lasting as long as the engine is running. Should the Engine overspeed, the Governor's normally open contacts will close, and supply a Battery feed to energize the Ignition Cut-Out Relay "E".

The INT-PRI contacts of this Relay will ground the Engine Ignition Coil and stop the Engine. Once the Ignition Cut-Out Relay "E" is energized it will become self-energized through its SOL contact until the circuit is broken by turning "OFF" the Ignition Switch at the Remote, Local or Manual Station (whichever one was used to start siren).

The Remote Control Operator will know some Safety Control has stopped the Siren because the Signal Light has gone out. Some models of the Overspeed Governor have a reset button that must be manually reset by pushing the reset button on the case, before another start is possible.

After any failure has been corrected, the Engine may be restarted by turning the Ignition Switch back "ON".

PENN SWITCH

The purpose of the Penn Switch is to stop the Siren Engine, if the Engine oil pressure should fall below fifteen (15) psi or the Engine water temperature exceed two hundred (200) degrees F., and to actuate a Signal Light, located at the Central Headquarters Station, when the Engine is running and the oil pressure and water temperature are normal.

The Penn Switch is a single-pole, double-throw switch, with a movable arm contactor, controlled by Engine oil pressure and water temperature. When the Engine is not running, the normal position of the movable arm contactor is against the "OFF" position contact, "L" to "M". When the Engine is started, the oil pressure trips the movable arm contactor against the "ON" position contact, "L" to "D".

During the Cranking Cycle, the Penn Switch is electrically inoperative; it does not receive a Battery feed until the Generator Relay "H" is energized, which takes place only after Engine has fired and is running up to 400 R.P.M.

During the Cranking Cycle and before the Engine has reached 400 R.P.M., the oil pressure has built up sufficiently to trip the movable arm contactor against the "ON" position contact "L" to "D". When the Generator Relay "H" is energized, a Battery feed is supplied to the Penn Switch "L" contactor, to "D" contact, through Turntable SIGNAL Slip Ring to the Local Station Control Box, and energizes the Signal Relay, when the Signal Relay closes its contacts a circuit is completed to GLOW a Signal Light at the Central Headquarters Station, indicating Siren is running and has normal oil pressure and water temperature.

In case of temperature or pressure failure, the Penn Switch movable arm contactor will trip from the "ON" contact, against the "OFF" position contact "L" to "M", to supply a Battery feed to energize the Ignition Cut-Out Relay "E". The INT-PRI contacts of this relay will ground the Engine Ignition Coil and stop the Engine.

The Remote Control Operator will immediately know some Safety Control has stopped the Siren, because the Signal Light went out when the Penn Switch tripped to "OFF" position. The Ignition Cut-Out Relay "E", through its SOL contact, will remain self-energized even after Penn Switch has lost its Battery feed by the opening of the Generator Relay "H", when Engine stopped.

The Circuit to the Ignition Cut-Out Relay "E" is broken by turning the Ignition Switch "OFF" at the Remote, Local or Manual Station (whichever one was used to start Siren). If the failure was due to high temperature, the Penn Switch will allow its movable arm contactor to trip back to the "ON" position, when the Engine water temperature drops below the critical value. After failure has been corrected, Engine may be restarted by turning Ignition Switch back "ON".

STARTIX

The purpose of the Startix is to close the power circuit from the Battery to the Starting Motor, when the control circuit is closed by the Operator. When the Engine starts, the Startix Unit is automatically disengaged by the Generator circuit. The Startix is equipped with an auxiliary starter button on the side of the case. It is primarily intended to be used for cranking Engine with Ignition "OFF" in maintenance operation. The method of operation is important. Press the button "Hard" and release "Quickly" - let the finger slip off side of the button.. Should the Starting Motor continue to spin after releasing the button, tap Startix case with Hand to dislodge auxiliary button contactor.

THROTTLE RELAY "G"

The purpose of the Throttle Relay "G" is to supply the Battery feed to energize the Throttle Solenoid when the Siren Engine is running and Sound Signal is desired. It is also used to prevent any pumping action to the Carburetor before the Engine has started or after it has stopped. The Throttle Relay "G" is equipped with a 20 Ampere fuse in the relay to Solenoid Circuit.

THROTTLE SOLENOID

The purpose of the Throttle Solenoid is to move the Engine Carburetor Throttle Valve to the wide open position when supplied a Battery feed by the Throttle Relay "G" and to allow its return to Idle position when the Throttle Relay "G" opens the Circuit. This action is instantaneous and allows for exact timing of the 8 second "ON" and 4 second "OFF" warning cycle operation.