Filling up and bleeding the internal cooling circuitBoth the drive and coolant must be at room temperature before filling up the cooling circuit.WARNING!Make sure that the maximum permissible operating pressure is not exceeded.When necessary regulate the pressure to appropriate level by draining excesscoolant out of the system.WARNING!Bleeding of the cooling circuit is very important and has to be done with great care.Air bubbles in the cooling circuit may reduce or completely block coolant flow andlead to overheating. Let the air out of the cooling system while filling in coolantand, eg. after any power module replacements.￭ Drive line-ups with an ACS880-1007LC cooling unitFollow the filling up and bleeding instructions in ACS880-1007LC cooling unit user's manual(3AXD50000129607 [English]).￭ Drive line-ups with a custom cooling unitNote:• In filling up the system, the drain valves in the line-up are used only to vent the air fromthe circuit so that it can be displaced by the coolant. The actual bleeding of the circuitmust be done via an external bleed valve installed at the highest point of the coolingcircuit. The most practical location for the valve is usually near or at the cooling unit.• Observe the instructions given by the manufacturer of the cooling unit. Pay specialattention to filling up and bleeding the pumps properly as they may be damaged ifoperated when dry.• Draining coolant into the sewer system is not allowed.1. Open the bleed valve at the cooling unit.2. Open the inlet valve and the outlet-side drain valve of one cubicle. Keep the outlet valveand the inlet-side drain valve closed.3. Attach a hose to the outlet-side drain valve and lead it into a suitable container.4. Fill the circuit with coolant. For coolant specification, see Coolant specification (page 140).Note: To minimize foaming, do not exceed the filling flow rate of 5 l/min(1.3 US gallon/min).5. As the piping and modules in the cubicle fills up, coolant starts to flow from the hose.Let some coolant flow out, then close the drain valve.6. Close the inlet valve.7. Repeat steps 2 to 6 for all cubicles in the line-up.8. Open the inlet and outlet valves in all cubicles. Let any air remaining in the system outthrough the bleed valve at the cooling unit.9. Close the bleed valve at the cooling unit.10. Continue to fill in coolant until a base pressure of 100…150 kPa is achieved.11. Open the bleed valve of the pump to let out any air.12. Re-check the pressure and add coolant if necessary.138 Internal cooling circuit
