Selection Tables For Recommended Brake Resistors; Abbreviations Used In The Brake Resistor Tables; Vlt ® Micro Drive Fc - Danfoss VLT Brake Resistor MCE 101 Design Manual

Selection Guide

8.2 Selection Tables for Recommended Brake Resistors

8.2.1 Abbreviations used in the Brake Resistor Tables

Mains Voltage class
P Rated motor size for frequency converter
m
R Minimum permissible brake resistor - by frequency converter
min
R Recommended brake resistor resistance of Danfoss brake resistors
rec
Thermo relay Brake current setting of external thermo relay
Danfoss part number Danfoss brake resistor order numbers
Recommended minimum value based upon PVC insulated copper cable. 30 °C ambient temperature with normal
Cable cross-section
heat dissipation
P Brake resistor average rated power. The temperature switch enables at approximate 90% of continuous rated
br,cont.
power at brake resistors with IP54, IP21 and IP65 enclosure protection
R The nominal (calculated) resistor value to ensure a brake power on motor shaft of 150/160/110% for 1 minute
br,nom
8.2.2 VLT ®
Micro Drive FC 51
10% duty cycle, horizontal braking, S2, T2, T4
FC 51
Frequency converter data
P R R
Mains
m min br,nom
type [kW] [Ω] [Ω]
S2 1.5 60.0
S2 2.2 40.0
T2 1.5 60.0
T2 2.2 40.0
T2 3.7 23.0
T4 1.5 234
T4 2.2 157
T4 3 113
T4 4 83.0
T4 5.5 60.0
T4 7.5 44.0
T4 11 29.0
T4 15 21.0
T4 18.5 17.0
T4 22 14.0
Table 8.1 S2, T2, T4, Horizontal Braking 10% Duty Cycle
MG90O202
Design Guide
R P
rec br,cont.
[Ω] [kW]
70.9 70 0.200
47.6 48 0.200
70.9 70 0.200
47.6 48 0.200
27.7 27 0.360
274.8 270 0.200
184.4 200 0.200
133.7 145 0.300
98.9 110 0.450
71.2 80 0.570
51.8 56 0.680
34.8 38 1.130
25.3 28 1.400
20.4 22 1.700
17.1 19 2.200
Danfoss A/S © Rev. 05/2014 All rights reserved.
Horizontal braking 10% duty cycle
Brake resistor data
Danfoss part number
Screw Screw
Wire IP54 terminal terminal
IP21 IP65
175u3026 - -
175u3031 - -
175u3026 - -
175u3031 - -
175u3326 175u3477 175u3478
175u3007 - -
175u3008 - -
175u3300 - -
175u3335 175u3450 175u3449
175u3336 175u3452 175u3451
175u3337 175u3027 175u3028
175u3338 175u3034 175u3035
175u3339 175u3039 175u3040
175u3340 175u3047 175u3048
175u3357 175u3049 175u3050
Installation
Cable
cross-
Bolt Thermo
section
connection relay
2
IP20 [mm ] [A]
- 1.5 1.6
- 1.5 1.9
- 1.5 1.6
- 1.5 1.9
- 1.5 3.5
- 1.5 0.8
- 1.5 0.9
- 1.5 1.3
- 1.5 1.9
- 1.5 2.5
- 1.5 3.3
- 1.5 5.2
- 1.5 6.7
- 1.5 8.3
- 1.5 10.1
8 8
33