855998A05 Mercury POWER TRIM ASSEMBLY, Complete

Illustration 1 g00627416
Allowable Combinations of Unbalanced Loads
Block Loading
The block loading is the instantaneous application of an electrical load to a generator set. This load may be anywhere from a moderate percentage of the rated load up to the rated load.The block loading capability of a generator set depends on the following factors.
Engine transient response
Voltage regulator response
Type of the voltage regulator
Altitude of operation of the generator set
Type of load
The amount of loadIf derating is required to block load, refer to ISO 3046 or SAE J1349 Standards. Also, reference Engine Data Sheet, LEKX4066, "Loading Transient Response" and Engine Data Sheet, LEKX4067, "Block and Transient Response".Note: ISO stands for International Standards Organization.Power Factor
The power factor is the ratio of apparent power to total power. The power factor is expressed as a decimal. The power factor represents that portion of the current which is doing useful work. The portion of current which is not doing useful work is absorbed in maintaining the magnetic field in motors or other devices. This current is called the reactive load. This current does not require engine power to be maintained.In most applications, electric motors and transformers determine the power factor of the system. Induction motors usually have a power factor of 0.8 or less. Incandescent lighting is a resistive load of about 1.0 power factor, or unity.The power factor of a system may be determined by a power factor meter or by calculations. Determine the power requirement in kW by multiplying the power factor by the kVA that is supplied to the system. As the power factor goes up, the total current that is supplied to a constant power demand will go down. A 100 kW load that is at 0.8 power factor will draw more current than a 100 kW load that is at 0.9 power factor. A high-power factor will result in a full engine load at less than the generator rated amperage. A lower power factor increases the possibility of overloading the generator.Note: The Caterpillar generators are rated at a power factor of 0.8 unless the generator is specified otherwise.Excitation System
Refer to the Operation and Maintenance Manual, "Voltage Regulators" for information on excitation systems.Standby Electric Sets
Most standby units are installed with controls for automatic starting. Standby units start without an operator in attendance.Standby units cannot automatically change the governor speed. Standby units cannot automatically change the setting of the voltage level. The governor speed and voltage level must be preset for the proper operation of that unit. Whenever the generator is operated manually, ensure that the settings for governor speed and voltage level are correct for automatic operation. Check all switches on the Standard Control Panel for the proper setting. Check all push buttons on the Premium Control Panel for the proper setting. On the Standard Control Panel, the Start Selector Switch should be in the AUTOMATIC position. On the Premium Control Panel, the "AUTO" push button is pressed.Generator Options
Battery Disconnect Switch
This switch is a single-pole switch. This switch cannot be used with dual electric starters.Space Heaters
The generator can be equipped with space heaters. The space heater is installed for operation in high humidity conditions. 120 volt and 240 volt space heaters are available.Radio Frequency Interference (RFI) Filter
This filter is available for applications that require a filter.Instrumentation
Three different remote start/stop panels are available. Extensions for the wiring harness are available to mount the panels. Contact your Caterpillar dealer for more information.