Installing braking resistors
The surfaces of the braking resistors will reach temperatures of up to 250 °C when the braking resistors are loaded with the nominal power. The installation location of the braking resistor must be designed according to the high temperatures. For this reason, the braking resistors are usually mounted outside the control cabinet. Non-permissible installation might lead to heat build-up in the braking resistor due to reduced convection. A tripping temperature contact or an overheated braking resistor can lead to a system standstill.
The following minimum clearances must be observed for convection cooling depending on the continuous braking power and the mounting position:
Continuous braking power at 100% cdf | Mounting position | Lateral distance or distance between resistors in mm | Downward | Upward |
|---|---|---|---|---|
Up to 1 kW | horizontalCorresponds to mounting position 1, 2, 5, 6. | 200 | 0 | 350 |
verticalCorresponds to mounting position 3, 4. | 150 | 250 | 300 | |
Up to 10 kW | horizontalCorresponds to mounting position 1, 2, 5 and 6. | 300 | 0 | 650 |
verticalCorresponds to mounting position 3, 4. | 250 | 350 | 600 | |
Up to 22 kW | horizontalCorresponds to mounting position 1, 2, 5 and 6. | 400 | 0 | 750 |
verticalCorresponds to mounting position 3, 4. | 350 | 400 | 700 | |
Up to 44 kW | horizontalCorresponds to mounting position 1, 2, 5 and 6. | 500 | 0 | 850 |
verticalCorresponds to mounting position 3, 4. | Not permitted | Not permitted | Not permitted |
Permitted mounting positions | ||
|---|---|---|
Grid resistor, | Wire resistor | Flat type resistor |
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The brake resistors BW003-420-T and BW1.0-170 may be used only in position 1.
