Cat Digital Voltage Regulator (Cat DVR)
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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. |
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| Illustration 1 | g01115009 |
The Cat DVR is a microprocessor-based voltage regulator. Control power for the Cat DVR is supplied from an external source of 24 VDC. 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 functions.
Adjusting the Cat DVR
In order 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.
GRT7-TH Voltage Regulator
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| Illustration 2 | g03784821 |
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| Illustration 3 | g03784830 |
(A) Top view (B) Front view (C) Detail of fixing hole | |
The GRT7-TH Voltage Regulator functions as follows:
P1 - Voltage adjustment.
P2 - Droop adjustment.
P3 - Stability - 2 adjustment.
P4 - Stability - 1 adjustment.
P5 - Under frequency adjustment.
Connections
E1 - Sensing voltage (160 up to 300 Vac).
E2 - Voltage (320 up to 600 Vac).
3 - Power supply.
E3/4 - Sensing voltage.
1 - Connection for pole S1 of the connection terminal, ratio IN/5^.
2 - Connection for pole S2 of the connection terminal, ratio IN/5^.
6 e 7 - Connection for potentiometer 5KΩ/3W.
F+, F- - Connection for generator field.
J1 - Jumper 50/60Hz (J1 open = 50Hz, closed = 60Hz).
A - Analog input voltage - 9 Vdc.
B - Analog input voltage + 9 Vdc.