COVER 1H6666 - Caterpillar

Cat Digital Voltage Regulator (Cat DVR)
The Cat Digital Voltage Regulator presents an electrical shock/electrocution hazard. This hazard will cause serious injury or death.Service by trained personnel only.The terminals and heat sinks are live at hazardous voltages when power is applied and for up to 8 minutes after power is removed.
Illustration 1 g03844029The Cat DVR is a microprocessor-based voltage regulator. Control power for the Cat DVR is supplied from an external source of 24 VDC. The power stage of the Cat DVR is supplied from either a high frequency permanent magnet generator, or an auxiliary winding in an internally excited (IE) generator. The SR5 generator utilizes a multi-pole PMG configuration. The SR500 utilizes a single pole PMG configuration. The high frequency permanent magnet generator is mounted on the end of the generator shaft. Connections to the Cat DVR are made through three connectors. The communication between the Cat DVR and the service tool is accomplished by using a CANBUS protocol.The Cat DVR has the following features:
Three control modes:
Automatic voltage regulation (AVR)
Power factor (PF) regulation
Reactive power (VAR) regulation
Programmable stability settings
Soft start control with an adjustable time setting in AVR mode
Dual slope voltage versus frequency (V/Hz) characteristic
Three-phase or single-phase voltage sensing
Single-phase current sensing
Field current sensing and field voltage sensing
Ten protection functionsAdjusting the Cat DVR
To view and configure the parameters of the Cat DVR, a PC with the Cat DVR software is required.Refer to Specifications, Systems Operation, Testing and Adjusting, RENR7941, "Cat Digital Voltage Regulator" for complete information.DER1 Voltage Regulator
The DER1 is a digitally controlled voltage regulator, based on DSP. Control power for the DER1 is supplied from an external source of 24 VDC. The power stage of the DER1 is supplied from either a high frequency permanent magnet generator, or an auxiliary winding in an Internal Excitation (IE) generator. the SR5 generator utilizes a multi-pole, Permanent Magnet (PMG) configuration, and the SR500 utilizes a single-pole, PMG configuration. The high frequency permanent magnet generator is mounted on the end of the generator shaft.
Digitally controlled regulator, based on DSP
Protection of power winding with 5A fast-acting fuse
Three-phase or single-phase sensing
Three-phase or single-phase sensing automatic recognition
Underspeed protection with adjustable threshold and slope
Overvoltage and undervoltage alarms
Excitation overcurrent protection with delayed interventionAdjusting the DER1
PC and USB modules are required to view and configure the parameters of the DER1. The USB to DER1 adapter is part number 542-2600.For complete information regarding the adjustment of the DER1, refer to the correct OEM manual.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 g06261662
Excitation Module 15 (EM15)
(1) Connector P3
(2) Connector P2
(3) Connector P4EMCP IVR Connection
To regulate the generator terminal voltage, the