The Basler Electric SR8A2B07B3A is a solid-state, high-reliability static voltage regulator designed to control the output of brushless AC generators by adjusting the exciter field current.
Product Parameters (Datasheet)
- Model Number: SR8A2B07B3A
- Series: SR Series (Static Regulator)
- Output Rating: 8A DC continuous
- Maximum Output: 12A DC for 10 seconds (forcing)
- Input Power: 120V or 240V AC (50/60 Hz)
- Sensing Input: Single-phase or three-phase (jumper selectable)
- Voltage Regulation: Within ±0.5% from no load to full load
- Operating Temperature: -40°C to +70°C
- Response Time: Less than 1.5 cycles for a 10% change in sensing voltage
- Build: Encapsulated design for vibration and moisture resistance
Country of Origin
This precision power control component is engineered and manufactured by Basler Electric Company in the USA, a leader in power system protection and excitation control.
Application Fields
The SR8A series is utilized across critical power generation sectors:
- Standby Power: Reliable voltage regulation for emergency generators in hospitals and data centers.
- Marine Power: Controlling shipboard generators subjected to high humidity and vibration.
- Industrial Cogeneration: Managing the voltage stability of on-site power plants.
- Telecommunications: Providing clean, regulated power for remote tower backup systems.
- Oil & Gas: Excitation control for generators in hazardous or remote drilling environments.
Product Usage Instructions
- Mounting: Install the regulator in a cool, dry location. The SR8A is encapsulated, but adequate airflow over the heat sink is required for 8A continuous operation.
- Sensing Connections: Connect the generator output leads to the sensing terminals. Ensure the sensing voltage matches the regulator’s range setting to prevent over-excitation.
- Field Connection: Connect the “F+” and “F-” terminals to the brushless exciter field. Observe correct polarity to ensure the generator builds up voltage properly.
- Voltage Adjustment: Use the onboard “Volt” potentiometer to set the desired generator output voltage. For remote adjustment, an external 10k ohm potentiometer can be wired to the designated terminals.
- Under-Frequency Protection: Adjust the “UF” (Under Frequency) roll-off point to protect the exciter and generator from overheating during low-speed operation.
Product Technical Description
The SR8A2B07B3A functions by monitoring the generator’s AC output voltage and comparing it to a precise internal reference. If the voltage drops, the regulator increases the DC output to the exciter field, which in turn increases the main generator output. It utilizes a Pulse Width Modulation (PWM) power stage to provide high efficiency and fast response. The “A2B” configuration in the model code typically specifies the sensing range and excitation frequency compatibility (standard or high frequency), while the “B3A” suffix denotes specific hardware revisions or mounting styles designed for rugged industrial use.
Q&A (Common Questions)
Q: Can I use the SR8A with a generator that has brushes? A: No, this regulator is specifically designed for brushless generators where the regulator drives the exciter field rather than the main rotor directly.
Q: What happens if my generator frequency drops? A: The regulator features an Under-Frequency Roll-off (UFRO) circuit. When the RPM drops below a set point, the regulator reduces the voltage proportionally to protect the magnetic components from saturation.
Q: Does it support parallel operation with other generators? A: To perform reactive droop compensation for parallel operation, an external CT (Current Transformer) must be connected to the “Droop” terminals of the regulator.
Q: What is the benefit of the encapsulated design? A: The encapsulation protects the internal electronics from salt air, fuel vapors, and mechanical vibration, which are common in marine and industrial environments.
Similar Model Recommendations
- Basler SR4A (4A Output version)
- Basler SR125 (Next-generation high-output series)
- Basler AVC63-7 (Modern encapsulated equivalent)
- Basler KR7F (Legacy magnetic amplifier regulator)
- Marathon SE350 (Standard alternative for smaller generators)
For more information on the Basler Electric SR8A2B07B3A and other excitation control solutions, please visit our online store.
