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LAMBDA
OBR is a range of Open wire wound Brake Resistors. They
are especially suitable for customer specified constructions
with specific demands to mechanical sizes. The resistors
are supplied as single components or as stacked resistor
banks.
The resistors have protection class IP00, but we can supply
Lambda resistors mounted in housings with protection class
IP20 up to IP23.
Construction
The resistor wire is wound around special ceramic insulators
with grooves keeping the wire in the right position. Metal
plates support the insulators as shown on the drawing
below.
For higher insulation levels, than specified in this data
sheet, the supporting metal plates are insulated with
ceramic insulators.
The resistors have solid terminals with screw holes for
M5 screw connection.
The terminals are connected to the resistor wire by either
welding or screw connection.
External Connection
Power cables can be connected to the terminals either
by normal screw connection or welded on the factory.
Load ability of Lambda Resistors depends on the mechanical
size and the specific resistor wire. The table shows some
examples of the power of some Lambda components.
When Lambda components are stacked in resistor banks the
load / component must be reduced.
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Electrical
specification:
Type:
OBR B/L
B:
Width of support plate.
L: Length of isolators. |
R
|
PN
W @40°C
|
P1/120
kW
@40°C
|
P5/120
kW
@40°C
|
P10/120
kW
@40°C
|
P40/120
kW
@40°C
|
Time
Const. sec. (Steady state)
|
R
W
± 10
% Rating
|
| OBR 40
/ 180 |
10
|
220
|
7
|
1.8
|
0.9
|
0.38
|
22
|
0,5
- 50
|
| OBR 40
/ 180 |
20
|
250
|
7
|
1.7
|
0.9
|
0.38
|
18
|
0,5
- 50
|
| OBR 40
/ 240 |
5
|
360
|
15
|
4
|
2
|
0.68
|
33
|
0,5
-68
|
| OBR 40
/ 240 |
10
|
350
|
12
|
3.2
|
1.8
|
0.64
|
26
|
0,5
- 68
|
| OBR 65
/ 300 |
2.2
|
530
|
21
|
5
|
2.7
|
0.94
|
36
|
1
- 120
|
| OBR 65
/ 300 |
5
|
510
|
19
|
4.5
|
2.5
|
0.85
|
26
|
1
- 120
|
| OBR 70
/ 360 |
10
|
580
|
17
|
4.4
|
2.5
|
0.85
|
28
|
1
- 120
|
| OBR 70
/ 360 |
22
|
580
|
19
|
4.6
|
2.6
|
0.94
|
23
|
1
- 120
|
| OBR 70
/ 360 |
2.2
|
900
|
47
|
11
|
6
|
1.8
|
43
|
1,2
- 160
|
| OBR 70
/ 360 |
5
|
810
|
34
|
9
|
4.9
|
1.5
|
31
|
1,2
- 160
|
| OBR 70
/ 360 |
10
|
730
|
32
|
8.5
|
4.5
|
1.4
|
33
|
1,2
- 160
|
| OBR 70
/ 360 |
20
|
920
|
35
|
9.5
|
5
|
1.5
|
27
|
1,2
- 160
|
| OBR 80
/ 420 |
2.2
|
960
|
51
|
14
|
7
|
2.5
|
47
|
1,5
- 200
|
| OBR 80
/ 420 |
5
|
1000
|
46
|
11.5
|
6
|
1.8
|
33
|
1,5
- 200
|
| OBR 80
/ 420 |
10
|
900
|
43
|
11.5
|
5.9
|
1.8
|
36
|
1,5
- 200
|
| OBR 80
/ 420 |
20
|
920
|
35
|
9.5
|
5
|
1.5
|
28
|
1,5
- 200
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PN:
NOMINAL POWER WITH NATURAL COOLING and mounted in a horizontal/vertical
position (like shown on the picture below)
WIRE TEMPERATURE: Peak: 500 K; Steady state 350K.
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General
Specifications
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Temperature
Coefficient:
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<±200ppm
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Dielectric
strength:
|
2500VAC
1 minute
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Working
Voltage:
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UL:
600VAC / CE: 690VAC; 1100VDC
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Isolation
Resistance:
|
>
20 M
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Overload:
|
5-10x
in 5 sec; 25-35 x in 1 s
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Environmental:
|
-40
°C - 90 °C
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Derating
:
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Linear:
40°C = PN to 70°C = 0.5*PN
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Mechanical
Specifications:
|
| Type: |
B±2
(mm)
|
L±2
(mm)
|
Weight
(Kg)
|
Type:
|
B±2
(mm)
|
L±2
(mm)
|
Weight
(Kg)
|
| OBR 40
/ 180 |
40
|
180
|
0.35
|
OBR
70 / 360
|
70
|
360
|
1.1
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| OBR 40
/ 180 |
40
|
180
|
0.35
|
OBR
70 / 360
|
70
|
360
|
0.95
|
| OBR 40
/ 240 |
40
|
240
|
0.5
|
OBR
70 / 360
|
70
|
360
|
0.92
|
| OBR 40
/ 240 |
40
|
240
|
0.5
|
OBR
70 / 360 |
70
|
360
|
0.93
|
| OBR 40
/ 300 |
65
|
300
|
0.76
|
OBR
80 / 420 |
80
|
420
|
1.4
|
| OBR 40
/ 300 |
65
|
300
|
0.72
|
OBR
80 / 420 |
80
|
420
|
1.2
|
| OBR 40
/ 300 |
65
|
300
|
0.7
|
OBR
80 / 420 |
80
|
420
|
1.15
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| OBR 40
/ 300 |
65
|
300
|
0.7
|
OBR
80 / 420
|
80
|
420
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1.1
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Type
identification::
More configurations (IP23, IP50, Protection grid) can
be supplied, please consult Danotherm .
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