5
Electrical Installation
Electrical Installation
Electrical Installation
Electrical Installation
66
07-02-12-02-EN-V1215.doc / Type:
638
Example for 638A:
EASYRIDER
Determination of the resistance values through the employment of both internal and external
resistors.
Internal “Brake Resistor = 170 Ohm“
External “Brake Resistor = 33 Ohm“
Rext.
1
.
int
R
1
Rges.
1
:
Formula
+
=
Ω
=
⇒
Ω
+
Ω
=
6
,
27
.
Rges
33
1
170
1
.
Rges
1
Selected Resistance Value =
27,6 Ohm
Determination of the brake resistor rating through the employment of both the internal and external
brake resistor ratings
Internal “Brake Resistor Rating = 20 Watt“
External “Brake Resistor Rating = 100 Watt“
Pext.
Pint.
Pges.
:
Formula
+
=
120W
Pges.
100W
20W
Pges.
=
⇒
+
=
Selected Power Rating =
120 Watt
CAUTION!
Installation of External Brake Resistors
Brake resistors create heat !
The Brake Resistor must therefore be installed in a manner which provides safeguards against the
potential danger of inadvertent touching or the danger of fire, during both normal operations and
under fault conditions.
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