KIT (water pump) 9N3139 - Caterpillar

Integrated Voltage Regulator (IVR)
The Integrated Voltage Regulator (IVR) is a feature within the EMCP 4 that regulates the generator output voltage by signaling a desired excitation command to the EM10 Excitation Module. The Excitation Module then provides field current to the generator exciter. The IVR function allows the EMCP 4 to control the generator voltage, with enhanced transient performance.The EM10 Excitation Module may interface with any of the following excitation systems: Self Excitation (SE), Internal Excitation (IE), and Permanent Magnet (PMG) excitation systems.For additional information about the IVR, see Application and Installation, LEBE0006, and Special Instruction, REHS9106.
Illustration 1 g03712568
Excitation Module 10 (EM10)
(1) Connector P3
(2) Connector P2
(3) Connector P4EMCP IVR Connection
To regulate the generator terminal voltage, the EMCP communicates the desired excitation command to the excitation module through a pulse width modulation (PWM) signal. A shielded twisted pair of cables must be used for the communication link. Table 1 details the connections to be made between the EMCP and Excitation Module.
Table 1
EMCP 4.2B Connections to Excitation Module (70-pin connector)
EMCP 4.2B 70-Pin Connector Excitation Module 3-Pin Connector
Digital Output #2 / IVR CS+ 68 CS+ P3-2
Battery negative splice 60 or 65 CS- P3-3
Battery negative splice 60 or 65 Shield P3-1
EMCP 4.4 Connections to Excitation Module (120-pin connector)
EMCP 4.4 120-Pin Connector Excitation Module 3-Pin Connector
PWM Output #2 Positive 28 CS+ P3-2
PWM Output #2 Negative 8 CS- P3-3
Shield 19 Shield P3-1 Table 2 provides information on the technical specification of the EM10 module. Selection of the appropriate module must be determined by the following:
Nominal and maximum generator excitation current at full load (standby 0.8 PF).
The maximum AC voltage input.
Table 2
EM10 Technical Specifications
Compatible Generator Excitation Types Permanent Magnet (PM) Self-Excitation (SE) Internal Excitation (IE/AREP)(1)
Nominal Field Current Output 6A
Maximum (forcing) Field Current Output 10A
Maximum AC Voltage Input 180Vms
(1) Internal Excitation (IE is also referred to as “Auxiliary Regulation Excitation Principle”(AREP)IVR Excitation Module Connections
The EM10 excitation module has three plug type multiple-pin connectors. The connectors are labeled P2, P3, and P4 as shown in illustration 1. Table 3 describes the signal and function of each connector pin.
Table 3
Excitation Module Connections
Terminal Label Signal/Function
P2-1 F+ Exciter Field Positive
P2-2 F- Exciter Field Negative
P3-1 Shield Excitation Command Control Signal Shield
P3-2 CS+ Excitation Command Control Signal Positive
P3-3 CS- Excitation Command Control Signal Negative
P4-1 X2 Excitation Power Supply Input X2
P4-2 Z1 Excitation Power Supply Input Z1
P4-3 X1 Excitation Power Supply Input X1
P4-4 Z2 Excitation Power Supply Input Z2 Note: The X2 and Z1 connections are internally linked within the excitation module. The link provides a point of common connection for the auxiliary windings where an AREP or IE excitation supply is available. Also, the X2 and Z1 connections may be linked externally to the excitation module. Only three connections (X1, X2, and Z2) are needed for the EM. Refer to Systems Operation/Test and Adjust/Troubleshooting, UENR1209, "Integrated Voltage Regulator Connections" for excitation module wiring connections. The wiring diagrams are for self-excitation (shunt), auxiliary windings (AREP/IE), and permanent magnet (PM) configurations.The voltage regulator knee frequency must be configured for your specific package requirements. The knee frequency