Cressall braking resistors
When large masses are to be stopped, these may generate energy which can be fed back into the motor or the drive system. The excess energy needs to be either re-generated or absorbed.
An external braking resistor provides a compact, cost effective method of controlling braking and absorbing excess energy produced.
Standard range braking resistors
| ES Series | HP Series | DBR Series | |
|---|---|---|---|
| Power range | 0,6-8 kW | 1,5-4,5 kW | 12-25 kW |
| Resistor element | Spiral wirewound | Spiral wirewound | Edgewound |
| Resistance material | Kanthal D | Kanthal D | Alkrothal 720 |
| Resistance change | +5% | +5% | +8% |
| Rated voltage | 1000 V | 1000 V | 1000 V |
| Overtemperature ind. | Accessory | Yes | Yes |
| Ingress protection | IP20 | IP20/21 | IP20/21 |
Larger braking resistors - special versions
Cressall also offers braking resistors for power ratings up to several megawatts based on standard modules as well as special versions. We offer
- Naturally air cooled and forced cooled designs
- Metal enclosed resistor elements
- Water cooled units
- Units for installation in hazardous locations
- Marine versions
How to size a braking resistor?
We have the expertise to help you select the right braking resistor. Just tell us
Resistance value
specified by the drive manufacturer. Higher resistance value can be used but the braking power will be reduced proportionally
Voltage over the resistor
for most common drive applications the switching voltage is around 700 V, Cressall standard resistors can operate up to 1000 V. Contact us for higher voltages.
Braking energy
determined from the energy generated by each braking. If detailed information of the braking energy is not available, we can help with an estimation.
Duty cycle
number of braking’s per time unit.
The more information we get, a more optimized solution can be offered. Extensive research and testing of individual resistor element makes it possible to predict the temperature rise in the resistor for different duty cycles. The result can be presented in the form of a temperature curve over time. Send us your inquiry!
Catalogues - PDF format
Cressall Resis
tors
ES, HP and DBR Series braking resistors
