Reliance 25G4260
May 28, 2026

Reliance 25G4260

The 25G4260 is a 25 HP (18.5 kW) three-phase AC sensorless vector variable frequency drive (VFD) from the Reliance Electric GV3000/SE (Sensorless Enhanced) series, also branded as VTAC7 for HVAC applications. It features a NEMA 12 (IP52) dust-tight and drip-proof enclosure, designed for heavy-duty industrial and commercial motor control. Though discontinued by the original manufacturer, surplus and refurbished units are widely used for maintenance and retrofitting legacy automation and HVAC systems.

Description

Product Description

The 25G4260 is a 25 HP (18.5 kW) three-phase AC sensorless vector variable frequency drive (VFD) from the Reliance Electric GV3000/SE (Sensorless Enhanced) series, also branded as VTAC7 for HVAC applications. It features a NEMA 12 (IP52) dust-tight and drip-proof enclosure, designed for heavy-duty industrial and commercial motor control. Though discontinued by the original manufacturer, surplus and refurbished units are widely used for maintenance and retrofitting legacy automation and HVAC systems.

Model Number Interpretation

  • 25: Rated power = 25 HP.

  • G: Series code for GV3000 AC drive platform.

  • 42: 4 = 380–460 VAC input. 2 = NEMA 12 (IP52) enclosure.

  • 60: Enhanced sensorless vector control, 50/60 Hz base rating.

  • (no suffix): Standard version with built-in keypad.

Technical Specifications

  • Rated Power: 25 HP (18.5 kW).

  • Input Voltage: 380–460 VAC, three-phase, 50/60 Hz.

  • Input Current: 37.0 A (full load).

  • Output Current: 30.4 A (full load).

  • Full Load Power Loss: 600 W.

  • Output Voltage: 0–460 VAC, three-phase.

  • Output Frequency: 0–200 Hz.

  • Control Modes: V/Hz, sensorless vector.

  • Enclosure: NEMA 12 (IP52), dust-tight and drip-proof, indoor panel-mount.

  • Operating Temperature: 0°C to +40°C (ambient).

  • Storage Temperature: −20°C to +60°C.

  • Cooling: Internal fan with side vents.

  • Weight: ~14.5 kg (32 lbs).

  • Certifications: UL, RoHS compliant.

Interface and Communication Configuration

  • Power Terminals: L1/L2/L3 (three-phase AC input); U/V/W (motor output); DC bus (+/−).

  • Control I/O: 8-channel 24 VDC digital inputs; 3 relay outputs (250 VAC / 5 A); 2 analog inputs (4–20 mA / 0–10 VDC); 2 analog outputs (0–10 VDC).

  • Communication: Onboard RS-232 port (behind front access panel) for keypad, HMI, or PLC connection.

  • Keypad/Display: Built-in membrane keypad with LED/LCD for local programming, operation control, and real-time status monitoring.

  • Encoder Feedback: Dedicated terminals for pulse tachometer input to enable high-precision speed regulation.

Core Functions

  • Dual Control Modes: Switchable V/Hz and sensorless vector control to accommodate diverse speed and torque regulation requirements.

  • High Low-Speed Torque: Sensorless vector control delivers stable high torque at low speeds, ensuring accurate motor performance without encoder feedback.

  • Comprehensive Protection: Integrated overvoltage, undervoltage, overcurrent, overload, and overtemperature protection safeguards the drive and motor.

  • Regenerative Energy Handling: Supports external dynamic braking resistors to dissipate regenerative energy during deceleration.

  • Parameter Storage: Non-volatile memory stores user-configured parameters for backup and copying.

  • Low-Noise Operation: Optimized PWM switching reduces acoustic noise and mechanical stress on the motor.

Application Scenarios

  • HVAC Systems: Ideal for large commercial and industrial heating, ventilation, and air conditioning systems (VTAC7 optimized).

  • Process Industry: Pumps, fans, blowers, mixers, and extruders.

  • Material Handling: Conveyors, cranes, and hoists.

  • Legacy System Retrofits: Direct replacement for older GV3000 series drives in 380–460 VAC three-phase systems.

Usage and Maintenance Instructions

  • Installation: Mount vertically on a rigid panel; maintain minimum clearance around the drive for proper airflow and cooling.

  • Wiring: Use shielded cables for control signals; separate power and control wiring to minimize electromagnetic interference.

  • Pre-Power Check: Torque all terminals to specifications before applying power.

  • Operation Monitoring: Regularly check operating current, temperature, and status during operation.

  • Maintenance Safety: Disconnect all power and wait for DC bus discharge before inspection or maintenance.

  • Periodic Maintenance: Check terminals for looseness, corrosion, or overheating; clean cooling fans and vents to remove dust buildup.

  • Environmental Limits: Do not operate outside the 0°C to +40°C ambient temperature range.

  • Storage: Keep spare units in a cool, dry, dust-free environment.

  • Repair Warning: Do not disassemble without professional supervision.

  • Environmental Limits: Do not operate outside the 0°C to +40°C ambient temperature range。

  • Storage: Keep spare units in a cool, dry, dust-free environment。

  • Repair Warning: Do not disassemble without professional supervision。



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