CAT 3412C - Page 76

Illustration 84 g00779058
The VR6 Voltage Regulator
(13) Terminal strip for attachments
(14) Droop adjustment
(15) Factory calibration of the voltage adjustment range
(16) Voltage adjustment
(17) Knee frequency adjustment
(18) Stability adjustment
(19) Terminal strip for sensing and power
Illustration 85 g00928349
The Cat VR6 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.
There are five adjustments on the VR6 voltage
regulator:
• Droop adjustment (14)
• Factory calibration of the voltage adjustment
range (15)
• Voltage adjustment (16)
• Knee frequency adjustment (17)
• Stability adjustment (18)
The factory calibration of the voltage adjustment
range (15) should not be adjusted by the user. For
the other adjustments, refer to Specifications,
Systems Operation, Testing and Adjusting,
RENR2480, “VR6 Voltage Regulator”.
The VR6 voltage regulator can operate in one of the
following modes:
• three-phase sensing
• single-phase sensing
The terminal strip for attachments (13)
accommodates the following optional connections:
• KVAR/PF controller
• External voltage adjust potentiometer
• Droop current transformer (CT)
• Selection of the under frequency slope
• Selection of the sensing phase
Adjusting the VR6
Refer to Specifications, Systems Operation, Testing
and Adjusting, RENR2480, “VR6 Voltage Regulator”
i05949130
Voltage Regulators
SMCS Code: 4467
Except for the oilfield generators, all Caterpillar SR4B
generators are provided with voltage regulators. The
voltage regulator controls the generator output
voltage.
76
SEBU7125-13
Operation Section
Voltage Regulators