HARNESS ASSEMBLY 1889865 - Caterpillar

Location Of Components
Control Panel - Front View(1) AC Ammeter (AM).(2) AC Voltmeter (VM).(3) Frequency meter (FM).(4) Spare fault light.(5) Engine overspeed fault light.(6) High coolant temperature fault light.(7) Low oil pressure fault light.(8) Voltage adjust rheostat (VAR).(9) Ammeter/Voltmeter phase selector switch (AVS).(10) Start aid switch (SAS) - optional.(11) Governor switch (GS) - optional.(12) Water temperature gauge (WTG).(13) Oil pressure gauge (OPG).(14) Key switch (KS).(15) Four light fault board (FFB).(16) Frequency meter resistor (FMR).(17) Terminal board (TBC).(18) Fuse block (FB).(19) Name plate.(20) Slave relay 1 (SR1).(21) Circuit breaker 2 (CB2).(22) Starting motor magnetic switch 1 (SMMS1).(23) Fuse 1 (F1) - fuel shutoff solenoid.(24) Fuse 2 (F2) - control panel.(25) Electronic speed switch (ESS).(26) Engine failure relay (ENFR).(27) Arming relay (AR).(28) Arming delay timer (ADT).The control panel is mounted on the generator terminal box. Each control panel has a specific nine character model number. An example of a typical model number is "T3C3HXRX0". The model number is stamped on name plate (19) which is located inside the control panel on the bottom. The model number is based on control panel options and generator ratings. Each character of the model number specifies a particular component of the control panel. Included with every control panel is 130-3786 Control Panel Chart. The chart print explains the meaning of each character of the model number.
Control Panel InteriorComponent Description
AC Schematic (JIC)
AM - AC Ammeter. AVS - Ammeter/Voltmeter Phase Selector Switch. FA,FB,FC - Fuses. FM - Frequency Meter. L1,L2,L3 - Load Leads. T1,T2,T3 - Generator Line Leads. VAR - Voltage Adjust Rheostat. VM - AC Voltmeter.Ammeter/Voltmeter Phase Selector Switch (AVS)
To avoid personal injury due to electrical shock, make sure jumpers are installed correctly on the AVS.
For reference, see the preceding AC Schematic illustration.The ammeter/voltmeter phase selector switch (AVS) allows the operator to select which electrical phase is shown on the AC ammeter (AM) and the AC voltmeter (VM). The AVS has four positions:* When in position 1, the AM shows T1 phase current and the VM shows T1-T2 phase voltage. AVS contacts 1, 2, 5, 6, 9, 10, 14, 15 and 17 of the AVS are closed.* When in position 2, the AM shows T2 phase current and the VM shows T2-T3 phase voltage. AVS contacts 1, 3, 5, 7, 9, 11, 14, 15 and 16 are closed.* When in position 3, the AM shows T3 phase current and the VM shows T3-T1 phase voltage. AVS contacts 1, 4, 5, 8, 9, 12, 15, 16 and 17 are closed.* When in position OFF, nothing is shown on the AM and the VM. AVS contacts 13, 14, 16 and 17 are closed.AC Ammeter (AM)
For reference, see the preceding AC Schematic illustration.The AC ammeter (AM) shows the amperes of the line current in phase 1, phase 2 or phase 3. The ammeter/voltmeter phase selector switch (AVS) is used to select the phase which is shown on the AC ammeter. The AVS connects the AM to a current transformer (CT1, CT2 or CT3) on phases T1, T2 or T3