￭ Connection to a custom cooling unit
General requirements
Equip the system with an expansion tank to damp pressure rise due to volume changes
when the temperature varies. Equip the system with a pump that provides a nominal flow
and pressure. Keep the pressure within the limits specified in Technical data (page 147).
Install a pressure regulator to make sure that the maximum permissible operating pressure
is not exceeded.
Install a bleed valve at the highest point of the cooling circuit, and a drain valve at the lowest
point.
The materials that can be used are listed in Cooling circuit materials (page 149).
Coolant temperature control
The temperature of the coolant in the internal cooling circuit must be kept within the limits
specified in Technical data (page 147). Note that the minimum temperature is dependent on
ambient temperature and relative humidity.
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.
Internal cooling circuit 145
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