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Reliance 29422‑V

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Reliance 29422‑V
May 28, 2026

Reliance 29422‑V

The 29422‑V is a dynamic brake interface module (also called a static rheostat or brake control module) for Reliance Electric GV3000/SE and VTAC7 series AC drives. It connects the drive’s DC bus to external braking resistors, dissipating regenerative energy during deceleration. The ‑V suffix indicates it is a voltage‑controlled variant, distinct from the 27106 series (current‑controlled). Obsolete OEM part; only surplus/refurbished units support legacy systems.

Description

Product Description

The 29422‑V is a dynamic brake interface module (also called a static rheostat or brake control module) for Reliance Electric GV3000/SE and VTAC7 series AC drives. It connects the drive’s DC bus to external braking resistors, dissipating regenerative energy during deceleration. The ‑V suffix indicates it is a voltage‑controlled variant, distinct from the 27106 series (current‑controlled). Obsolete OEM part; only surplus/refurbished units support legacy systems.

Model Number Interpretation

  • 29422: Base part number for voltage‑controlled brake interface module.

  • V: Voltage‑controlled logic (vs. 27106 = current‑controlled).

Technical Specifications

  • DC Bus Voltage: 380–460 VAC input (540–650 VDC bus).

  • Switching Element: Wearless transistor switch (terminals 1(−)/2(+)).

  • Control Logic: S1‑2 closes when UDC > 50 V and IB = 0; opens when UDC > 50 V and IB > 0, or UDC < 50 V.

  • LED Indicator: Right LED ON when braking current (IB) > 0.

  • Enclosure: Open‑frame PCB, panel‑mount.

  • Operating Temperature: 0°C to +50°C.

  • Weight: ~0.55 kg (1.2 lbs).

Interface & Wiring

  • DC Bus Terminals: Connect to drive’s DC+ / DC−.

  • Resistor Terminals: 1(−) / 2(+) for external braking resistor (resistance matched to drive power).

  • Control Signal: Tied to drive’s braking logic (no external wiring needed).

  • LED Status: IB > 0 (braking active) → ON; IB = 0 → OFF.

Core Functions

  • Regenerative Energy Dissipation: Converts motor regenerative energy to heat via external resistors, preventing DC bus overvoltage.

  • Voltage‑Controlled Braking: Activates based on DC bus voltage threshold, suitable for consistent‑load applications.

  • Overvoltage Protection: Shunts excess DC bus voltage during deceleration, safeguarding drive components.

  • Status Indication: LED provides visual braking status for troubleshooting.

Compatibility

  • Drive Series: GV3000/SE (Sensorless Enhanced), VTAC7 (HVAC).

  • Drive Models: 25V4160, 25G4160, 25G4260, 3V4160, etc.

  • Input Voltage: 380–460 VAC three‑phase.

Installation & Maintenance

  • Mounting: Secure to panel near drive; allow 50 mm clearance for airflow.

  • Wiring: Use 14–16 AWG stranded wire for DC bus/resistor connections; torque terminals to 1.2 N·m.

  • Pre‑Power Check: Verify resistor resistance (match drive rating); check for short circuits.

  • Maintenance: Inspect terminals annually for looseness/corrosion; clean dust from PCB.

  • Safety: Disconnect drive power and wait 5 minutes for DC bus discharge before service.


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