RACE 7C2743 - Caterpillar

Illustration 1 g02177193
(1) "P6" connector
(2) LED indicator
(3) "P12" connector
(4) "P9" connector
(5) "J4" connector The Cat Digital Voltage Regulator ( CDVR) is a microprocessor-based voltage regulator. The main purpose of a digital voltage regulator is to regulate the output voltage of a generator that is used with an engine generator set. Control power for the digital voltage regulator is supplied from an external 24 DCV source. The power stage of the digital voltage regulator can be supplied from the following:
Multi-pole high frequency permanent magnet generator (PMG)
Generator output (shunt excitation)
Auxiliary windings that are included on some generatorsConnections to the digital voltage regulator are made through three multi-pin plug type connectors. The communication between the digital voltage regulator and a service tool is accomplished using a CANBUS protocol.The Caterpillar Digital Voltage Regulator has three multiple-pin, plug-type connectors. These connectors are labeled "P6", "P9", and "P12".Connector "P6" is a six-pin header that mates with a six-pin connector. Connector "P9" is a nine-pin header that mates with a nine pin connector. Connector "P12" is a twelve-pin header that mates with a twelve-pin connector.The digital voltage regulator has a nine-pin D sub connector that is labeled "J4". This connector is used for interface with IBM compatible personal computers.Note: Hard wire the Caterpillar Digital Voltage Regulator to earth ground with at least a 16 AWG copper wire that is attached to the ground terminal "P6-6".Note: When the unit is configured in a system with other devices, a separate lead should be used to ground the bus from each device.Note: Ensure that wiring for remotely installed digital voltage regulators will be free of induced signals from other conductors. Induced signals or electromagnetic noise can adversely affect the performance of the regulator or other system components.Note: The sensing wires, the PMG wires and the exciter field wires are to be routed in a separate tray or conduit when the digital voltage regulator is remotely mounted. The optional customer wiring is to be separated from all other signals in a control wiring conduit. The voltage sensing wires must be twisted together. The exciter field wires must also be twisted together.CDVR Changes
Firmware
The latest version of the CDVR firmware allows the CDVR to be used for open generator set applications or in Tier 4i rental applications. The open generator set applications can have EMCP II, EMCP 3, or EMCP 4 generator set controllers. The Tier 4i rental applications can have EMCP 4.2 or EMCP 4.4 generator set controllers with "complex" software installed.CDVR firmware was changed to add four settings groups, in addition to all the original parameters, to support switchable ratings via CAN communications. The CDVR firmware change provides four different voltage and frequency machine ratings to be configured automatically without requiring reprogramming by the operator. Previously, changes for voltage and/or frequency ratings must be made with the use of a PC and Cat ET Service Tool.The EMCP 4.2 and EMCP 4.4 "complex software" also provides four different voltage and frequency machine ratings that can be configured. The "complex software" has