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Converters with a customer cooling unit
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Notes:
•
The bleed valves in the converter 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.
Bleeding and draining valves are not included in the standard delivery of the ABB
converter.
•
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 propylene glycol into the sewer system is not allowed.
1.
Open the bleed valve at the cooling unit.
2.
Lead the bleed hoses into buckets or other suitable containers. Extend the standard
hoses if necessary.
3.
Fill the circuit with coolant. For coolant specification, see below.
4.
After the converter is filled up, coolant will start flowing from the bleed hose of the
converter. Let some coolant flow out before closing the bleed valve.
5.
Let any air remaining in the system out through the bleed valve at the cooling unit.
6.
Close the bleed valve at the cooling unit.
7.
Continue to fill in coolant until a base pressure of 100...150 kPa is achieved.
8.
Open the bleed valve of the pump to allow any air out.
9.
Re-check the pressure and add coolant if necessary.
10. Start the coolant pump. Let any air remaining in the system out through the bleed valve
at the cooling unit.
11. After one to two minutes, stop the pump or block the coolant flow with a valve.
12. Re-check the pressure and add coolant if necessary.
13. Repeat steps 10...12 a few times until all air is let out of the cooling circuit. Listen for
a humming sound and/or feel the piping for vibration to find out if there is still air left in
the circuit.
Adjustments
•
Set the base pressure to 100...150 kPa by draining coolant from the fill/drain coupling.
•
Control the coolant temperature so that it stays between the limits stated in section
Specifications (page
121).
Cooling and heating 119
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