Closed-loop cooling circuits - Cooling of AC main drives - Cooling of motor spindles on machining centres - Cooling of transmission and braking systems - Cooling of servomotors The FWKS fluid cooling system consists of a tank, a submersible pump and a plate heat exchanger. The submersible pump built into the plastic tank pumps coolant through the plate heat exchanger. A secondary cooling water circuit, which also flows trough the heat exchanger, provides the necessary cooling.