Parker 638 series

5 Electrical Installation
Electrical InstallationElectrical 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
.intR
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
+
=
120WPges.100W20WPges.
=
⇒
+
=
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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