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112 Internal cooling circuit
Filling up and bleeding the internal cooling circuit
Both 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 excess
coolant 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 and
lead to overheating. Let the air out of the cooling system while filling in coolant
and, eg. after any power module replacements.
￭
Drive line-ups with an ACS880-1007LC cooling unit
Follow the filling up and bleeding instructions in ACS880-1007LC cooling unit user's manual
(3AXD50000129607 [English]).
￭
Drive line-ups with a custom cooling unit
Note:
•
In filling up the system, the drain valves in the line-up are used only to vent the air from
the circuit so that it can be displaced by the coolant. The actual bleeding of the circuit
must be done via an external bleed valve installed at the highest point of the cooling
circuit. 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 special
attention to filling up and bleeding the pumps properly as they may be damaged if
operated 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 valve
and 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
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 out
through 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.
Coolant specification (page
114).
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