8.2 Selection Tables for Recommended Brake Resistors
8.2.1 Abbreviations used in the Brake Resistor Tables
Mains
Voltage class
P
m
Rated motor size for frequency converter
R
min
Minimum permissible brake resistor - by frequency converter
R
rec
Recommended brake resistor resistance of Danfoss brake resistors
Thermo relay
Brake current setting of external thermo relay
Danfoss part number Danfoss brake resistor order numbers
Cable cross-section
Recommended minimum value based upon PVC insulated copper cable. 30
°
C 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 brake power on motor shaft of 150/160/110% for 1 minute
8.2.2 VLT
®
Micro Drive FC 51
10% duty cycle, horizontal braking, S2, T2, T4
FC 51
Horizontal braking 10% duty cycle
Frequency converter data
Brake resistor data
Installation
R
rec
[
Ω
]
P
br,cont.
[kW]
Danfoss part number
Cable
cross-
section
[mm
2
]
Thermo
relay
[A]
Mains
type
P
m
[kW]
R
min
[
Ω
]
R
br,nom
[
Ω
]
Wire IP54
Screw
terminal
IP21
Screw
terminal
IP65
Bolt
connection
IP20
S2
1.5
60.0
70.9
70
0.200
175u3026
-
-
-
1.5
1.6
S2
2.2
40.0
47.6
48
0.200
175u3031
-
-
-
1.5
1.9
T2
1.5
60.0
70.9
70
0.200
175u3026
-
-
-
1.5
1.6
T2
2.2
40.0
47.6
48
0.200
175u3031
-
-
-
1.5
1.9
T2
3.7
23.0
27.7
27
0.360
175u3326
175u3477
175u3478
-
1.5
3.5
T4
1.5
234
274.8
270
0.200
175u3007
-
-
-
1.5
0.8
T4
2.2
157
184.4
200
0.200
175u3008
-
-
-
1.5
0.9
T4
3
113
133.7
145
0.300
175u3300
-
-
-
1.5
1.3
T4
4
83.0
98.9
110
0.450
175u3335
175u3450
175u3449
-
1.5
1.9
T4
5.5
60.0
71.2
80
0.570
175u3336
175u3452
175u3451
-
1.5
2.5
T4
7.5
44.0
51.8
56
0.680
175u3337
175u3027
175u3028
-
1.5
3.3
T4
11
29.0
34.8
38
1.130
175u3338
175u3034
175u3035
-
1.5
5.2
T4
15
21.0
25.3
28
1.400
175u3339
175u3039
175u3040
-
1.5
6.7
T4
18.5
17.0
20.4
22
1.700
175u3340
175u3047
175u3048
-
1.5
8.3
T4
22
14.0
17.1
19
2.200
175u3357
175u3049
175u3050
-
1.5
10.1
Table 8.1 S2, T2, T4, Horizontal Braking 10% Duty Cycle
Selection Guide
Design Guide
MG90O202
Danfoss A/S © Rev. 05/2014 All rights reserved.
33
8
8
Содержание VLT Brake Resistor MCE 101
Страница 2: ......