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ARM CYLINDER 2277969 - Caterpillar



2277969 ARM CYLINDER Caterpillar parts ARM
Rating:
41
Alternative (cross code) number:
CA2277969
227-7969
2277969
Caterpillar 2277969 ARM CYLINDER

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Normal Source Voltage Available
When an acceptable normal source voltage signal is sensed by the Utility Voltage Sensor circuit board, that circuit board's UTILITY ON light (LED) will be illuminated. The circuit board will take no action. A transformer reduced voltage from the Transfer Mechanism LOAD terminals is delivered to the Microprocessor Based Control circuit board, to operate the 7-day exercise timer circuit in that circuit board. Units with optional In-Phase Monitor or Programmable Logic Control circuit board will have a separate 7-Day Exerciser circuit board. See Transfer Switch Options.Normal Source Voltage Dropout
The Utility Voltage Sensor circuit board mounts a Voltage Dropout Sensor and a Line Interrupt Delay Timer (see "Sensor and Timer Adjustments" section of this manual).Should normal source voltage drop below the setting of the Voltage Dropout Sensor and remain at such a low state longer than the setting of the Line Interrupt Delay Timer, the following will occur:1. The board's UTILITY ON light (LED) will go out.2. Circuit board action will close the automatic start circuit (terminals 178/183), and will signal the standby generator engine to crank and start.3. When standby generator AC output voltage is available to Transfer Mechanism STANDBY terminals (E1, E2 and E3), and to primary windings of Standby Sensing Transformer T1. A reduced voltage from the T1 secondary winding will be delivered to (a) the STANDBY OPERATING light, and (b) the System Microprocessor Based circuit board. That lamp will illuminate and that circuit board will operate.4. An Engine Warmup Timer and a Minimum Run Timer on the Microprocessor Based Control circuit board start to time. The Engine Minimum Run Timer setting is fixed at 10 minutes and the Engine Warmup Timer setting is 30 seconds. On units with optional In-Phase Monitor or Programmable Logic Control circuit board, the Engine Warmup and Minimum Run Timers are adjustable. See "Sensor and Timer Adjustments" section of this manual.5. When STANDBY generator AC output voltage and frequency have reached 80% of the rated voltage/frequency, and when the Engine Warmup Timer has timed out, the Microprocessor Based Control board action will energize the Transfer Relay circuit. If the Time Delay Neutral switch is ON, the action of the Time Delay Relay (also controlled by the Microprocessor Based Control board) will hold the main transfer switch contacts at neutral (tripped) for about five seconds. The main contacts are then permitted to complete the transfer action to standby.Power for all transfer actions to the standby source is provided by the standby power source. Thus, standby power must be available before any transfer to that source can occur. On units with optional In-Phase Monitor or Programmable Logic Control board, the time delay at neutral is adjustable from 0.1 to 10 seconds.6. With load connected to the standby power source, the Switch Position-Standby light comes ON.7. The Utility Voltage Sensor circuit board continues to seek an acceptable normal source voltage.Normal Source Voltage Restored
The Utility Voltage Sensor houses a Voltage Pickup Sensor. The Microprocessor Based Control board incorporates a Return to


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