1.4.16 Brake Resistors
Internally mountable brake resistors for low duty cycle braking. The resistors are self-protecting.
Single pulse braking approx. 0,6 kJ each 1-2 minutes.
Internal brake resistors cannot be mounted in FCD 303-315 with service switch.
Type FCD
P motor kW
Rmin
R
Duty cycle approx. %
Code no.
303
0.37
520
1720
5
175N2154
305
0.55
405
1720
3
175N2154
307
0.75
331
1720
2
175N2154
311
1.1
243
350
1.5
175N2117
315
1.5
197
350
1
175N2117
322
2.2
140
350
1
175N2117
330
3.0
104
350
0.7
175N2117
335
3.3
104
350
0.5
175N2117
Type
P
motor
[kW]
R
MIN
[
Ω
]
Size [
Ω
] / [W]
per item
Duty cycle %
2 wires
Order no.
175Uxxxx
Screened cable
Order no.
175Nxxxx
303 (400 V)
0.37
520
830
Ω
/ 100 W
20
1000
2397
305 (400 V)
0.55
405
830
Ω
/ 100 W
20
1000
2397
307 (400 V)
0.75
331
620
Ω
/ 100 W
14
1001
2396
311 (400 V)
1.10
243
430
Ω
/ 100 W
8
1002
2395
315 (400 V)
1.50
197
310
Ω
/ 200 W
16
0984
2400
322 (400 V)
2.20
140
210
Ω
/ 200 W
9
0987
2399
330 (400 V)
3.00
104
150
Ω
/ 200 W
5.5
0989
2398
335 (400 V)
3.30
104
150
Ω
/ 200 W
5.5
0989
2398
Table 1.1: Flatpack brake resistors IP 65
Type
Order no.: 175Nxxxx
303-315
2402
322-335
2401
Table 1.2: Mounting bracket for brake resistors
VLT type
Intermittent braking period time
[seconds]
P
motor
[kW]
R
min
[
Ω
]
R
rec
[
Ω
]
P
b, max
[kW]
Therm.relay
[Amp]
Code number
175Uxxxx
Cable cross section
[mm
2
]
303 (400 V)
120
0,37
520 830 0,45
0,7
1976
1,5*
305 (400 V)
120
0,55
405 830 0,45
0,7
1976
1,5*
307 (400 V)
120
0,75
331 620 0,32
0,7
1910
1,5*
311 (400 V)
120
1,1
243 430 0,85
1,4
1911
1,5*
315 (400 V)
120
1,5
197 330 0,85
1,6
1912
1,5*
322 (400 V)
120
2,2
140 220 1,00
2,1
1913
1,5*
330 (400 V)
120
3,0
104 150 1,35
3,0
1914
1,5*
335 (400 V)
120
3,3
104 150 1,35
3,0
1914
1,5*
Table 1.3: Coiled wire brake resistors Duty-cycle 40%
*Always observe national and local regulations
P
motor
: Rated motor size for VLT type
R
min
: Minimum permissible brake resistor
R
rec
: Recommended brake resistor (Danfoss)
P
b, max
: Brake resistor rated power as stated by supplier
Therm. relay
: Brake current setting of thermal relay
Code number
: Order numbers for Danfoss brake resistors
Cable cross section
: Recommended minimum value based upon PVC insulated cober cable, 30 degree Celsius am-
bient temperature with normal heat dissipation
See dimensions of Coiled wire brake resistors in instructions MI.90.FX.YY
Externally mounted
brake resistors
in general
No use of aggressive cleaning solvents. Cleaning solvents must be pH neutral.
See
Dynamic Braking
for dimensioning of brake resistors.
VLT
®
Decentral FCD 300 Design Guide
1 The Decentral Concept
MG.90.S1.02 - VLT
®
is a registered Danfoss trademark
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