Cat Digital Voltage Regulator General Information Caterpillar


General Information
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1.1. CDVR Changes
2.2. Firmware
3.2. Cat ET Warning Message
4.3. Configuration Parameters of Latest CDVR
5.3. Supplier Defaults
6.2. Part Numbers
7.1. Connectors
8.2. Connector "P6"
9.2. Connector "P9"
10.2. Connector "P12"


Illustration 1g02177193
(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 generators

Connections 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 AVSpare 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 AVSpare 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 been changed to support switchable ratings via CAN communications.

Note: Refer to the information in Specifications, Systems Operation, Testing and Adjusting, RENR7941, "Group Support Level" for related information.

A combination of two switched inputs to the EMCP will cause one of four settings groups to become active within the EMCP for a desired rating.

  1. The engine must be stopped for the switched inputs to effect a change in the settings group activation.

  2. The EMCP will send the "active group number" to the CDVR via the CAN communication port.

  3. The CDVR reads the "active group number" that was sent from the EMCP.

  4. The CDVR will activate the corresponding settings group within the CDVR.

  5. Unit is ready for startup.

The latest version of the CDVR also provides a switch input that is a programmable input that can be configured for four different functions. The earlier version of the CDVR referred to the switch input as the "fault reset". The programmable input is used with Tier 4i EP rental products. The programmable input is used is to switch to "voltage droop mode" whenever loads are shared with older units that do not have EMCP 4.4 reactive load sharing capability.

Settings Groups

There are four settings groups within the CDVR. Each group contains the seven parameters listed below. The parameters are labeled #1, #2, #3, or #4 to distinguish which group the parameter belongs to.

  • Rated voltage

  • Rated current

  • Rated frequency

  • AVR voltage set point

  • Power input frequency

  • Minimum frequency

  • Knee frequency

Programmable Input

The load compensation mode will remain programmable as in the earlier CDVR firmware. The load compensation mode will follow the programmable input setting as long as the input remains activated unless both of the following are true:

  • The programmable input is set to one of the load compensation modes

  • The input is activated

Then, if the input is deactivated, the load compensation mode will follow the "load compensation mode" configuration parameter.

The programmable input can be configured for any one of the following selections:

  • Fault reset (supplier default)

  • Load compensation forced to off mode

  • Load compensation forced to voltage droop mode

  • Load compensation forced to line drop (IR compensation) mode

Cat ET Warning Message

This publication contains information about the latest version of the CDVR and the earlier version of the CDVR. In order to avoid any confusion, a warning message can appear under the following circumstance.

A warning message will appear if a version earlier than ET2011A of Cat ET is used to connect to the latest version of CDVR. Refer to Illustration 2.



Illustration 2g02695036

The warning message is to inform the user that the CDVR firmware has configuration parameters that are not supported by the version of Cat ET used by the computer. If the latest version of the CDVR is set to the supplier defaults, the user can press the "OK" button and proceed as normal.

Configuration Parameters of Latest CDVR

  • Settings groups

  • Programmable input and associated parameters

Supplier Defaults

  • Setting groups support level set to "single group"

  • Programmable input set to "fault reset"

Part Numbers

Table 1
  Earlier Part Numbers  Current Part Numbers 
CDVR  314-7755  361-8010 
CDVR Firmware  318-4763  361-1006 
CDVR PC Software  252-7515  367-5010 
Required Cat ET Software    ET2011A or later 

Connectors

Connector "P6"



Illustration 3g01013614
Pin out for the "P6" connector on the CDVR

Table 2
P6 Terminal Functions 
Terminal  Function 
P6-1  Power Input (single phase) 
P6-2  Power Input (single phase) 
P6-3  Power Input 
P6-4  F- 
P6-5  F+ 
P6-6  Chassis Ground 

Connector "P9"



Illustration 4g01013761
Pin out for the "P9" connector on the CDVR

Table 3
P9 Terminal Functions 
Terminal  Function 
P9-1  CANbus - High 
P9-2  CANbus - Low 
P9-3  CANbus - Drain (shield) 
P9-4  Contact Sense - Lower 
P9-5  Contact Sense - Raise 
P9-6  Contact Sense - Common 
P9-7  Contact Sense - Excitation Disable 
P9-8  Contact Sense - Fault Reset(1) 
P9-9  Contact Sense - Var/PF Enable 
(1) Refer to the "CDVR Changes" section of Specifications, Systems Operation, Testing and Adjusting, RENR7941. In the earlier firmware version, the switch input is a fixed function for "fault reset". In latest firmware version, however, the switch is defined as a "programmable input" and can be configured. However, the supplier default setting remains "fault reset".

Connector "P12"



Illustration 5g01013628
Pin out for the "P12" connector on the CDVR

Table 4
P12 Terminal Functions 
Terminal  Function 
P12-1  B-phase generator current sensing (CT1) 
P12-2  B-phase generator current sensing (CT2) 
P12-3  ±10 DCV Input (B), - 
P12-4  Alarm Output Driver (24 V, 100 mA) 
P12-5  Fault Shutdown Driver (24 V, 100 mA) 
P12-6  ±10 DCV Input (A), + 
P12-7  18 to 30 V Control Power Input (B-) 
P12-8  18 to 30 V Control Power Input (B+) 
P12-9  Driver Supply (50) (24 V, 100 mA) 
P12-10  Generator Voltage Sensing - C (T3), lead 20 for SR4 and SR4B generators)(1) 
P12-11  Generator Voltage Sensing - B (T2), lead 24 for SR4 and SR4B generators)(1) 
P12-12  Generator Voltage Sensing - A (T1), lead 22 for SR4 and SR4B generators)(1) 
(1) Refer to the generator set wiring diagrams.

The CDVR has the following features:

  1. Three control modes:

    1. Automatic voltage regulation (AVR)

    2. Power factor (PF) regulation

    3. Reactive power (VAR) regulation

  2. Programmable stability settings

  3. Soft start control with an adjustable time setting in AVR mode

  4. Dual slope voltage versus frequency (V/Hz) characteristic

  5. Three-phase or single-phase voltage sensing

  6. Single-phase current sensing

  7. Field current and field voltage sensing

  8. Ten protection functions

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