DIFFERENTIAL GP-NOSPIN 1280751 - Caterpillar

Adjusting the CDVR
In order to view and configure the parameters of the CDVR, a PC with the Cat PC software is required.Voltage sensing for the CDVR is also achieved via an internal switch located on the chassis of the top control panel box. The unit must not be running when the voltage switch is changed. When changing between three-phase and single-phase voltage, the EMCP flash file setting for sensing type will need to be changed using Cat electronic technician.Refer to Specifications, Systems Operation, Testing and Adjusting, RENR7941, "Cat Digital Voltage Regulator (CDVR)" for complete information.Integrated Voltage Regulator (IVR)
The Integrated Voltage Regulator (IVR) provides excitation current to the generator. The IVR is controlled by the IVR function in the EMCP4. The IVR function allows the EMCP4 to control the generator voltage, optimize transient performance, and provide feature specification.The 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 2 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 twisted pair of shielded cable must be used for the communication link. Table 1 details the connections to be made between the EMCP and Excitation Module.
Table 1
EMCP 4.1 and EMCP 4.2 Connections to Excitation Module (70-pin connector)    
EMCP 4.1 and EMCP 4.2 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 4.3 and EMCP 4.4 Connections to Excitation Module (120-pin connector)    
EMCP 4.3 and 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 and EM15 modules. 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 and EM15 Technical Specifications    
    EM10     EM15    
Compatible Generator Excitation Types     Permanent Magnet (PM) Self-Excitation (SE) Internal Excitation (IE/AREP) (1)    
Nominal Field Current Output     6A     7A    
Maximum (forcing) Field Current Output     10A     15A    
Maximum AC Voltage Input     180Vms     240Vms    
( 1 ) Internal Excitation (IE is also referred to as "Auxiliary Regulation Excitation Principle"(AREP)IVR Excitation Module Connections
The EM10 and EM15 excitation modules have three plug type multiple-pin connectors. The connectors are labeled P2, P3, and P4 as shown in illustration 2. Table 3 describes the