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S SIGMA
is our range of MODULAR BRAKE RESISTORS. Thanks to
the modular construction it is possible also at small quantities
to supply an optimum solution to any problem concerning start-
or brake resistors in connection with frequency converters.
The resistor components consist of fully welded wire wound
ceramic resistors, which is a well-known and approved technology.
The base material is corderite, which is a type of ceramic
with a very high resistance to temperature changes and the
wire is coated with aluminium phosphate to protect the wire
and conduct the heat developed in the wire on to the ceramic
core. Aluminium-phosphate is stable at 700°C. |
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The modular
resistor cages comply with IP20 and give electrical and
thermal protection.
The resistors
have a nominal load from 100W and upward and are particularly
suitable for pulse load of 10 - 20 time or more compared
to the nominal load because of the ceramic core material
and an extra high weight of wire.
We have developed thermal models corresponding to all
resistor types and resistor values. By using these models
we are able to calculate the rises in temperature in the
resistor wire for all possible load situations. Danotherm
offers our assistance to our customers to find the optimum
solution for any situation.
Each SIGMA-MODULE is supplied
with resistor components corresponding to the actual load.
 The
mechanical sizes are shown in the table. In principle as many
components as necessary can be mounted together.
The modules can be supplied as open resistors (only resistor
and mounting brackets) or with protection grating according
to IP20 and with a ceramic housing connector or with a connector
box.
It is possible to have a thermostat which works as a temperature
watch and high voltage versions >400VDC.
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Resistor:
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| Ceramic
Core: |
20-30
mmØ |
Steatite
C221 |
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55
mmØ |
Corderite |
Resistor
Wire: |
CrAlFe/CrNi/CuNii
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| Terminals: |
FeNi42
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| Coating: |
Aluminiumphosphate
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Resistor
Cage:
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| Mounting
Bracket: |
Steel,
hot galvanised 1,5mm pe |
| Protection
grating: |
Steel,
hot galvanised 1,5mm pe |
| Connectors: |
Porcelain |
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| Cables: |
Silicone
(silicone less possible) |
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Resistor
tolerance:
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| standard: |
±
10 % |
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©
Copyright 1998-2004
DANOTHERM ELECTRIC A/S
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