ULV 800 15 J FL=1000 Datasheet: Key Specs & Performance
The ULV 800 15 J designation indicates a vertical metal-clad braking resistor engineered to absorb short high-energy pulses while providing a defined chassis FL=1000 continuous capability. This device is optimized for short-duration dump events rather than sustained continuous dissipation, making it ideal for compact industrial cabinets where space and pulse handling are prioritized.
| Parameter | Specification Details |
|---|---|
| Series Family | ULV 800 (Vertical Metal-Clad) |
| Pulse Energy | 15 Joules (Single Event) |
| Power Class | FL=1000 (Chassis/Flange Rated) |
| Form Factor | Vertical Mounting, Ventilated Cabinet Design |
| Primary Use | VFD Braking, Elevator Regenerative Dumps |
1 — Product Background: Decoding the ULV Series
1.1 — Model Code & Form Factor
The ULV = vertical metal-clad series; 800 = model size; 15 J = single pulse energy capability; and FL=1000 = chassis continuous power class. This wire-wound design is intended for vertical rack mounting, utilizing convective airflow within industrial panels.
2 — Datasheet Deep Dive: Performance Limits
Engineers must prioritize resistance tolerance and peak current limits. The 15 J rating is a pulse-centric figure. If the system requires repetitive braking, the average power must not exceed the thermal limits defined by the FL=1000 chassis rating and ambient temperature derating curves.
3 — Sizing Case Study: 15kW VFD Circuit
- Motor Power: 15 kW
- Deceleration Time: 2 seconds
- Estimated Regen Energy: 15 kW × 2 s = 30 kJ
- Component Match: A single ULV 800 15 J (15 Joules) is 2000x below the required capacity.
- Solution: Use a high-capacity resistor bank or a unit specifically rated for kJ-level pulses.
4 — Installation & Maintenance Checklist
- Orientation: Always mount vertically to ensure proper heat dissipation via the metal-clad chassis.
- Torque: Follow datasheet specifications for terminal connections to prevent arcing.
- Monitoring: Use thermal sensors or external fusing to protect against sustained regen overloads.
- Inspection: Check monthly for resistance drift, terminal loosening, or signs of environmental corrosion.
5 — FAQ
How does datasheet pulse rating relate to real stopping events for the ULV 800 15 J?
Pulse rating defines energy absorbed in a single test pulse under specific waveform and ambient conditions; real stopping events can differ in energy and repetition, so translate motor regen energy into comparable pulse energy units and check repetitive-pulse curves.
What is the role of FL=1000 in selecting a braking resistor?
FL=1000 denotes a chassis/flange continuous capability class used by manufacturers to indicate sustained dissipation capacity in specified mounting and airflow conditions; ensure cabinet cooling and mounting match datasheet assumptions.
When should I replace a ULV resistor in a VFD braking application?
Replace when resistance drifts beyond tolerance, insulation resistance falls below safe limits, thermographic inspection shows hot spots, or when repeated overtemperature events indicate cumulative damage.
Is the 15 J rating sufficient for high-inertia loads?
Generally no. 15 J is designed for low-energy, fast-acting pulse events. For high-inertia loads (like large fans or centrifuges), calculate the kJ energy and select a resistor bank with appropriate cumulative pulse capacity.
Action: Consult the official manufacturer datasheet for exact mechanical drawings and mounting torque limits before final installation.
