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Resistor braking
225
Custom resistor installation and wiring
Effective cooling of the resistors must be ensured.
WARNING!
All materials near the brake resistors must be non-flammable. The
surface temperature of the resistors is high. The temperature of the air rising from
the resistors is hundreds of degrees Celsius. Protect the resistors against contact.
For resistor cable, use the type specified for drive input cabling (specified under
chapter
Technical Data)
so the input fuses will protect the resistor cable also. Two-
conductor shielded cable with the same cross-sectional area can alternatively be
used. The maximum length of the resistor cable is 10 m.
For protection against overheating, resistors with thermal circuit breakers (standard
in ABB resistors) should be used. The circuit breakers should be wired to the
ENABLE inputs of the brake choppers.
WARNING!
The ENABLE input terminal blocks of the choppers are at intermediate
circuit potential when the supply unit of the ACS800-37 is running. This voltage is
extremely dangerous and may cause serious damage or injuries if the isolation level
and protection conditions for the thermal circuit breakers are not sufficient. The
normally-closed breakers should always be properly isolated (over 2.5 kV) and
shrouded against contact.
Note:
For the ENABLE input wiring, use cable rated as follows:
• twisted pair (screened type recommended)
• rated operating voltage between a core and earth (
U
0
):
≥
750 V
• insulation test voltage > 2.5 kV
Summary of Contents for ACS800-37-0060-3
Page 1: ...ACS800 Hardware Manual ACS800 37 Drives 55 to 2700 kW 75 to 3000 HP ...
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Page 18: ...Table of contents 18 ...
Page 42: ...The ACS800 37 42 ...
Page 58: ...Mechanical installation 58 ...
Page 85: ...Electrical installation 85 5 4 7 8 9a 9b 6a 3 6b 6c ...
Page 108: ...Installation checklist and start up 108 ...
Page 144: ...Technical data 144 ...
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