ABB ACS880-304LC Series, Hardware Manual, Page: 109 / 178

Internal cooling circuit
Contents of this chapter
The cooling system of a liquid-cooled drive consists of two circuits: the internal cooling
circuit and the external cooling circuit. The internal cooling circuit covers the
heat-generating electrical components of the drive and transfers the heat to the
cooling unit. In the cooling unit, the heat is transferred to the external cooling circuit
which is usually part of a larger external cooling system. This chapter deals with the
internal cooling circuit.
Applicability
The information in this chapter is applicable to cabinet-built ACS880 liquid-cooled
drives. Except where otherwise indicated, the information is also applicable to drives
built out of ACS880 liquid-cooled multidrives modules.
Internal cooling system
Each cubicle has an inlet and an outlet manifold, fitted with a stop valve and a drain
valve. The stop valves can be closed to isolate all modules in the cubicle from the main
cooling circuit.
In cabinet line-ups built by ABB, valves are color-coded:
• Blue – Open during operation
• Red – Closed during operation
The following diagram shows the coolant pipe connections in a drive system consisting
of a supply unit and an inverter unit. Other units, such as brake units, DC/DC converter
units have similar cooling arrangements. Other cubicles containing components that
require cooling may also contain heat exchangers.
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Internal cooling circuit 109