Internal cooling circuit
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Internal cooling circuit
General
The cooling system of the drive consists of two circuits: firstly, the internal cooling
circuit that covers the heat-generating electrical components and transfers the heat
to the cooling unit, and the external cooling circuit that is usually part of a larger
external cooling system. This chapter deals with the internal cooling circuit.
Internal cooling system diagram
The following is a diagram of how the coolant circulates in the supply, inverter and
brake units of a drive system.
The modules in each cubicle can be isolated from the main cooling circuit by closing
the inlet (a) and outlet valves (b). Each cubicle is also equipped with a drain valve (c)
and a bleed valve (d).
Supply
module
A/L
LCL filter Inverter modules Brake
chopper
b d
a c a c a c a c
b d b d b d
Coolant
OUT
Coolant
IN
A/L = Air to liquid heat exchanger
A/L A/L A/LA/LA/L A/L
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