• Custom built resistors to meet your requirements.
• High Power and Excellent load life stability.
• Excellent short time over load.
• Strongly resistant to moisture & solvent.
• Self-extinguish material is used in moldings.
• Non-inductive type also available.
• High-surge- resistant items are also available
General Specifications:
Test
Conditions
Operating Temp.
-550c - +2750c
Insulation Resistance
20MW MIN
Dielectric Strength
AC 1000V, 2000V for 1 min
Temp. Coefficient
50 ppm/0c, 100 ppm/0c, 260 ppm/0c
Short Time Over Load
10 X Wattage Rating, 5 sec
Moisture resistance
temp 400c moisture 95% DC100v500h
Thermal Shock
Wattage Rating 30min. -250c, 15min
Vibration
10c/c ~ 50 c/s ~ 10 c/s (1min) -2h each of paralleled and right angle.
Load Life
Wattage Rating 1.5 h On, 30min off, 1000h
De-rate to zero
at 2750c
Mechanical Data:
Watts@ 20 0c with heat sink
Watts@ 20 0c without heat sink
DIMENSIONS (MM)
Approx. Weight (g)
L1
L2
W
H
D
60
48
115
100
40
20
4
110
80
64
140
125
40
20
4
150
100
80
165
150
40
20
4
180
120
96
190
175
40
20
4
240
150
120
215
200
40
20
4
300
200
140
165
150
60
30
5.3
500
300
210
215
200
60
30
5.3
700
400
240
265
250
60
30
5.3
850
500
300
330
315
60
30
5.3
1000
750
450
330
315
80
40
5.3
1900
1000
600
400
385
80
40
5.3
2300
1200
720
495
480
80
40
5.3
2900
1500
900
550
535
80
40
5.3
3200
Recommended Heat Sink Size for additional optimum performance:
60W-120W: 200 x 200 x 3 mm
150W-300W: 300 x 300 x 3 mm
400W-500W: 450 x 450 x 3 mm
If finned heat-sink is used, surface area should be equal to the above heat sink area.
Construction
SBH: The resistive element is a low ppm resistance wire that is wound on a special grade porcelain tube. The terminals have fully welded construction to provide a good mechanical and electrical contact. The assembly is embedded in the aluminum casing. The aluminum casing is made from high quality heat sink grade material, which helps to dissipate the heat from the resistor at the faster rate resulting low change of resistance with respect to temperature, as resistance varies in direct proportion to temperature. The casing is filled with high purity and special silica sand to extract the heat from the resistor body at the slower rate. The conduction of heat thorough the sand brings uniform heat to the aluminum casing for further dissipation. This protects the panels from being heated internally. Terminal contacts are provided with the screw arrangement for easy wiring.
Electrical Characteristics
• On Heat Sink 60W~500W
• Free Air 60W~150W
• Free Air 200W~300W
• Free Air 400W~500W
Fig - Maximum dissipation (Pmax) in percentage of rated power as a function of the ambient temperature (Tamb)
Application Information
Braking resistors are used with inverters, driving motors with a dynamic load that requires to be stopped quickly, such as lifts, cranes, or high-speed mechanisms. The braking resistor is connected in the DC link, between the rectifiers and the switching semi-conductors. When the DC voltage rises, to a pre selected limit, a chopper circuit switches in the braking resistor thereby allowing excess energy to be "dumped" in the form of heat, instead of causing damage to the inverter. When the DC level drops to a lower preset minimum limit the braking resistor is switched out of circuit until it is required again.
