6.2.5 Recommended Brake Resistors
Line power Voltage class
P
m
Rated motor size for adjustable frequency drive type
R
min
Minimum permissible brake resistor by adjustable frequency drive
R
rec
Recommended brake resistor resistance of Danfoss brake resistors
Thermo relay Brake current setting of external thermo relay
Part number Danfoss brake resistor order numbers
Cable cross-section
Recommended minimum value based upon PVC insulated copper cable. 30 °C (86 °F) ambient temperature with
normal heat dissipation
P
br,cont.
Brake resistor average rated power. The temperature switch enables at approximate 90% of continuous rated
power at brake resistors with IP54, IP21 and IP65 enclosure protection
R
br,nom
The nominal (calculated) resistor value to ensure a braking energy on motor shaft of 150/160/110% for 1 minute
Table 6.6 Abbreviations used in Table 6.7 to Table 6.14
Type code and Selection Design Guide
MG20N622 Danfoss A/S © 09/2014 All rights reserved. 127
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