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58 Electrical installation: AC input, motor and brake
Brake resistor (regeneration resistor)
An optional external brake resistor might be required to dissipate excess power from
the internal DC-bus during motor deceleration. The brake resistor must have a
resistance of at least 39
Ω
, an inductance of less than 100
μ
H, and a minimum power
rating of 44 W. Care should be taken to select the correct resistor for the application;
see the
Brake (X1)
section starting on page
140
. Suitable brake resistors are listed in
Resistor choice
on page
143
. The brake resistor output is conditionally short circuit
proof.
WARNING!
Electrical shock hazard. DC-bus voltages can be present at these
terminals. Use a suitable heat sink (with fan if necessary) to cool the brake
resistor. The brake resistor and heat sink (if present) can reach temperatures in
excess of 80 °C (176 °F).
Earth/ground outer shield,
using 360° conductive
clamp connected to
enclosure backplane
Brake resistor
STAR
POINT
Содержание MicroFlex e150
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Страница 26: ...26 Hardware description ...
Страница 32: ...32 Mechanical installation ...
Страница 42: ...42 Planning the electrical installation ...
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