Cat® Digital Voltage Regulator Caterpillar

Startup Procedure

Usage:

SR4B 1BN

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Illustration 1	g01425354

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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.

Connect the digital voltage regulator. Refer to Testing and Adjusting, "Wiring Diagrams" for a proper illustration. Take care to follow notes and observe polarities.
Apply battery power only to the regulator.
Connect serial cable between CATV and PC. Start the CATV PC Software. Establish communication between the CATV and the PC. For more details, refer to "Establishing Communications" located in the "Remote Communication" section.

Verify that all of the parameters are properly adjusted for the application. The following parameters may need to be set for first configuration. For more details, refer to "Settings Definitions" located in the "Parameter Viewing and Configuration (Caterpillar PC Software)" section.

System Configuration

Rated Voltage (V)
Rated Current (A)
Frequency
PT Primary (V)
PT Secondary (V) - A PT is required if the generator is rated at more than 600 VAC. If no PT is installed, set the PT Primary and PT Secondary to rated voltage.
CT Primary
Power Input Frequency (Hz) - Refer to Table 1.
Sensing Mode - Three phase is the typical Caterpillar setting.

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Table 1
Operating Frequency	50HZ	60HZ
Self Excited Generators	50HZ	60HZ
Permanent Magnet Generators Low and Medium Voltage	200HZ	240HZ
6 Pole Generators	133HZ	160HZ
High Voltage 2600 Frame Generators	200HZ	240HZ
High Voltage 2400 and 2800 Frame Generators	150HZ	180Hz

Setting Adjustments
- AVR Voltage (V) - Desired voltage for AVR mode.
- VAR (percent of rated) - For VAR mode.
- Power Factor - Must select Droop under "Load Compensation Mode" for PF control.
- Soft Start Bias (percent) - A starting value for the regulator on startup.
- Soft Start Time (sec.) - For emergency applications, this value may need to be set to 2 seconds, or less.
- Knee Frequency (Hz) - Select a value that is 0.2 to 2 Hz below rated frequency.
- Slope 1 (V/Hz) - 2V per Hz suggested.
- Slope 2 (V/Hz) - Refer to Illustration 2.
Control Gain Settings
- For applications that require special PID settings, refer to the "Gain Setting - Adjust" section.
Protections Settings
- "Shutdown Override" Button - Leave disabled.
- Generator Overvoltage - Configure as required by the application.
- Generator Undervoltage - Configure as required by the application.
- Reverse VAR - Configure as required by the application.
- Fault Reset Too Long - Configure as required by the application.
- Over Excitation - Configure as required by the application.
- Exciter Diode Monitor - Configure as required by the application.
- Loss of Sensing - Configure as required by the application.
- Over Excitation: Type - Threshold is the default setting. If "Inverse Time" is selected, the time setting must be changed to a suggested value of 2 (based on the time dial settings for the SR4B Generator curve). If this value is not changed, over excitation protection may not exist.

Press the EEPROM button to save the settings in the CDVR.
Start the engine. Make the final adjustments, as required.
Press the EEPROM button to save the settings in the CATV.
Record all settings. For more details, refer to "Settings File" located in the "Parameter Viewing and Configuration (Caterpillar PC Software)" section.
Press the "Get From Unit" button on the "CDVR PC Software - System Configuration" dialog to verify that the settings were saved.
Disable communications (if desired). For more details, refer to "Terminating Communications" located in the "Remote Communication" section.