Digital guide
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Key Specifications:
- Model Code Breakdown:
- BE2 = Brake Energy Resistor, Series 2
- 090 = 90 Ω resistance value
- 20 = 2000 W power rating (continuous)
- Resistance Value: 90 Ω (±5% tolerance)
- Continuous Power Rating: 2000 W (at 25°C ambient, natural convection)
- Peak Power Rating: 4000 W (10-second duration, 1 cycle per minute)
- Max Voltage: 600 VDC (do not exceed)
- Thermal Construction: Ceramic-wirewound element, aluminum housing
- Protection Rating: IP00 (open frame, requires enclosure mounting)
- Cooling: Natural air convection (no fan)
Structural Features:
- Construction: Ceramic substrate with nickel-chromium resistance wire, powder-coated aluminum housing
- Dimensions (approx.): 220 mm × 140 mm × 90 mm (W×H×D)
- Weight: Approximately 4.8 kg
- Mounting: Panel mount with M6 bolt holes (4-point mounting)
- Terminals: Screw terminals (M6, accepts up to 16 mm² cable)
Electrical Parameters:
| Parameter | Value |
|---|---|
| Resistance | 90 Ω (±5%) |
| Continuous Power | 2000 W |
| Peak Power | 4000 W (10 s) |
| Max Voltage | 600 VDC |
| Inductance | < 5 µH |
| Element Max Temperature | 155°C |
| Operating Ambient | -25°C to +45°C |
| Compliance | CE, UL, cUL |
Working Principle:
During rapid deceleration or overhauling load conditions, the servo motor acts as a generator. The regenerated energy raises the DC bus voltage. When the bus voltage reaches the overvoltage threshold (typically ~410 VDC for a 300 VDC system, ~780 VDC for a 480 VDC system — consult drive manual), the drive activates the brake chopper. Excess energy is routed to the external brake resistor, where it is converted to heat and dissipated by convection.
Applicable Industries: Heavy-duty CNC machines, gantry systems, cranes, hoists, large-inertia conveyor systems, wind turbine pitch control
Installation Requirements:
- Mount in well-ventilated enclosure with minimum 150 mm clearance on all sides
- Use 16 mm² minimum copper cable for connections
- Connect to drive brake output terminals (B1, B2) — observe polarity
- Do not install near flammable or heat-sensitive materials
Usage Notes:
- Derate power by 1.5% per °C above 25°C ambient temperature
- Do not operate above 600 VDC — risk of insulation breakdown and fire
- For continuous full-load operation, install forced-air cooling fan to maintain element temperature below 125°C
- This 2000 W variant is rated for higher-inertia loads than the BE2-090-14 (1400 W) variant
