62 Unidrive M/HS Frame 5 to 6 Power Installation Guide
Issue Number: 9
Table 4-6 Heatsink mounted braking resistor data
* To keep the temperature of the resistor below 70 °C (158 °F) in a 30 °C (86 °F) ambient, the
average power rating is 100 W. The above parameter settings ensure this is the case.
4.10.2 External braking resistor
When a braking resistor is to be mounted outside the enclosure, ensure that it is mounted in a
ventilated metal housing that will perform the following functions:
• Prevent inadvertent contact with the resistor
• Allow adequate ventilation for the resistor
When compliance with EMC emission standards is required, external connection requires the cable
to be armored or shielded, since it is not fully contained in a metal enclosure. See section
3.5.1 Enclosure layout on page 32 for further details.
Internal connection does not require the cable to be armored or shielded.
Parameter Size 5
Part number 1299-0003
DC resistance at 25 C 37.5
Peak instantaneous power over 1 ms at nominal resistance 16 kW
Average power over 60 s * 100 W
Ingress Protection (IP) rating IP54
Maximum altitude 2000 m
Overload protection
When an external braking resistor is used, it is essential that an overload protection device
is incorporated in the braking resistor circuit; this is described in Figure 4-9 on page 65.
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