The GRTD-TH3 is a digital voltage regulator designed for brushless generators, operating with or without an auxiliary coil (shunt). It is a compact device that offers features similar to analog voltage regulators while enhancing the reliability and protection of synchronous machines. The regulator is intended for installation within the generator's junction box. Its base is constructed from aluminum, chosen for its excellent creep resistance, dimensional stability under low load, low variation of properties with temperature changes, and low coefficient of thermal expansion. Crucially, its characteristics remain unaffected by electrical variations.
Function Description:
The GRTD-TH3 serves to regulate the output voltage of a generator. It achieves this through a sophisticated digital control system that includes a PI controller. The regulator continuously measures the generator's voltage and compares it to a set reference. Any deviation from this reference is corrected by adjusting the excitation current supplied to the generator's field. The device also incorporates various protections and limiters to ensure safe and stable operation of the generator.
Important Technical Specifications:
- Nominal Output Current: 10 A
- Forced Output Current (for 1 minute): 12.5 A
- Fuse for Power Supply Protection: 10 A / 300 V
- Vad Trimpot Adjustable Sensing Voltage Range:
- E1: 160 Vca to 300 Vca
- E2: 330 Vca to 600 Vca
- Frequency of Operation (Sensing Voltage Range): 50 Hz or 60 Hz
- Generator Voltage Measuring Range: 0 to 840 Vca
- Generator Minimum Voltage for Pre-excitation: 5 Vca
- Minimum Generator Frequency for Control: 22 Hz
- Rated Operating Voltage (Power): 220 Vca
- Power Supply Range (3 & E3/4): 50 to 280 Vca (up to 300 Vca in transient)
- Frequency of Operation (Power Supply): 50 Hz or 60 Hz
- Power Fluctuation Voltage (Power): ±30%
- Maximum Input Power: 1350 VA
- Power Consumption (by equipment): ~13 VA
- Power Connection: Single phase
- Sensing Voltage Connection: Single phase
- Rectifier Gain Ratio Controlled (no load): 0.45
- Maximum Field Voltage: 135 Vcc
- Static Regulation: < 0.5%
- U/f Limiter: Adjusted to 54 Hz or 45 Hz
- Dynamic Response (adjustable by trimpot Stb): 8 to 500 ms
- Working Temperature Range: -40°C to 60°C
- Storage Temperature Range: -20°C to 40°C
- Maximum Relative Humidity (operation and storage): 0 - 80%
- Pollution Degree: 3
- Protection Degree: IP00
- Operation Altitude: Less than 2000m or greater equal to 2000m
- EMI Suppression: Differential EMI filter class X2
- Alarm Signaling: Indication of the alarms on the RGB LED
- Regulator LED OK: LED RGB Green flashing and 5V lit indicates OK status
- Approximate Weight: 350g +/-10g
- Analog Input: ± 10 Vcc
- Analog Input Variation: Variation: +/-15% of the reference voltage
- Digital Input Variation: CW com UP e DW / ±10% of the reference voltage
- Parallel Operation - Droop: TC PAR/5A ou PAR/1A
- Droop: Ranging from 0 to 10 % of the reference voltage
- Protections: Generator overvoltage, Generator overcurrent excitation, Generator overcurrent, Rotating diode failure, Lack of sensing voltage at startup, Thermal excitation limit (Excitation current), U/F, Lack of sensing voltage in operation, Maximum shot angle, µController failure
- Resin: Polyurethane anti-flame (V0)
- Base: Non-flammable cast aluminum (V0)
- Relay (protection alarm): NF – Ok | NA – On protection (10A – 250VCA/125VCA/24VCC)
Usage Features:
- Configurability: The GRTD-TH3 is highly configurable. Users can adjust the armature voltage reference, stability, and "droop" using built-in potentiometers (trimpots).
- Voltage Adjustment Options:
- Vad Potentiometer: Adjusts the reference voltage between 160-300Vac (E1) or 330-600Vac (E2). Clockwise rotation increases voltage, counter-clockwise decreases it.
- Analog Input: Allows for a ±15% variation on the reference voltage via a -10Vcc to +10Vcc input, with a consumption of up to 10mA.
- Digital Input: Uses dry contacts (CM with UP or DW terminals) to increase or decrease the output voltage by 15% from the nominal voltage (Un) over a 10-second ramp.
- Advanced Processing: Equipped with a state-of-the-art processor capable of executing 70 million instructions per second and a high-accuracy analog-to-digital converter. This enables fast and precise acquisition of electrical quantities, leading to excellent operability and accurate calculations.
- Connection: Utilizes FASTON connectors for generator connections.
- Parallel Operation with Reactive Compensation (Droop): When operating in parallel with other generators or a network, the "Droop" mode modifies the generator's reference voltage based on reactive power variations, helping to maintain voltage close to the busbar and reduce reactive power generation. The droop trimpot limits this compensation.
- Protections: A comprehensive suite of protections is integrated, including generator overvoltage, excitation overcurrent, armature overcurrent, rotating diode fault, U/f limiter, and loss of sensing voltage. These protections act on a virtual key to cancel the output voltage, restoring operation only after a "RESET" (de-energization).
- Alarm Signaling: Alarms are indicated by an RGB LED, with different colors signifying specific fault conditions (e.g., Strong Blue for generator overvoltage, Red for excitation overcurrent, Yellow for armature overcurrent, Cyan for rotating diode fault, Purple for U/f limiter, Yellow-Green for maximum firing angle, Shock Pink for microcontroller failure). A relay provides status via auxiliary contacts (NF-ok / NA-fault).
- IoT Module Interface: The product includes an interface for an IoT module, enabling the transmission of generator information. This connectivity module can be purchased separately and supports Bluetooth or RS485, transmitting data via GPRS, including location and date/time of the alarm.
Maintenance Features:
- Preventive Maintenance: Regular inspection for dust and debris is necessary. All terminals and wiring connections must be kept free from corrosion.
- Cleaning: The equipment can be cleaned with a dry flannel or a brush to remove dust and accumulated debris.
- Authorized Service: Only trained and authorized personnel from PEGASUS TECHNOLOGY should service the equipment to prevent damage and ensure proper functioning.
- Safety Precautions: Before performing any maintenance or cleaning, the equipment must be disconnected from the generator, and the primary machine must be turned off to eliminate electrical hazards. It is recommended to wait a few minutes for the equipment to cool down before accessing it due to high temperatures in some components (up to 150°C).
- Troubleshooting: The manual provides a table of common problems, their causes, and solutions, aiding in diagnosis and resolution.
- Warranty: A 12-month warranty is provided, subject to proper transport, handling, storage, correct installation within specified environmental conditions, regular preventive maintenance, and no unauthorized repairs or modifications. The identification label and serial number must remain intact.
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