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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 multidrive 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.
Internal cooling circuit 99
9
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