Emc Compliance Of The Complete Installation; Placing The Brake Resistor; Protecting The System Against Thermal Overload - ABB ACS880-104 Hardware Manual
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- Hardware manual (406 pages) ,
- Firmware instructions (664 pages) ,
- Firmware manual (604 pages)
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328 Resistor braking using frame R1i...R4i inverter modules
EMC compliance of the complete installation
Note: ABB has not verified that the EMC requirements are fulfilled with external user-
defined brake resistors and cabling. The EMC compliance of the complete installation
must be considered by the customer.
Placing the brake resistor
Install the resistor outside the inverter cubicle where they will be able to cool.
Arrange the cooling of the resistor in a way that
•
no danger of overheating is caused to the resistor or nearby materials
•
the temperature of the room the resistor is located in does not exceed the allowed
maximum.
Supply the resistor with cooling air or coolant according to the manufacturer's instructions.
WARNING! The materials near the brake resistor must be non-flammable. The
surface temperature of the resistor is high. Air flowing from the resistor is of
hundreds of degrees Celsius. If the exhaust vents are connected to a ventilation
system, ensure that the material withstands high temperatures. Protect the resistor against
contact.
Protecting the system against thermal overload
The inverter module protects itself and the resistor cable against thermal overload when
the cable is correctly dimensioned. The inverter control program includes a resistor and
resistor cable thermal protection function which can be tuned by the user. See the
firmware manual.
Equipping the drive system with a main contactor or breaker is highly recommended for
safety reasons. Wire the contactor or breaker so that it opens in case the resistor
overheats. This is essential for safety since the inverter module may not be able to break
the current if the chopper remains conductive in a fault situation. An example wiring
diagram is shown below. ABB resistors are equipped with a thermal switch (1) inside the
resistor assembly as standard. The switch indicates overtemperature and overload.
We recommend that you also wire the thermal switch to a digital input of the inverter
module.
L1 L2 L3
1
3
5
2
4
6
L1 L2 L3
Drive system
1
OFF
2
13
ON
14
1
K1
3
4
ACS880-104
+24VD
x
DIx
x
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