ABB ACS880-87LC-4000A/4021A-7, Руководство по оборудованию

Страница: 133 / 144

Cooling and heating 133
Filling up and bleeding the internal cooling circuit
Both the converter and coolant must be at room temperature before filling in the cooling
circuit.
WARNING! Obey these instructions. If you ignore them, injury or death, or
damage to the equipment can occur.
•
Make sure that the maximum permissible operating pressure is not exceeded.
When necessary control the pressure to appropriate level by draining excess coolant
out of the system.
•
Do not drain propylene glycol into the sewer system.
•
Be careful when you bleed the cooling circuit. Air bubbles in the circuit may reduce or
completely block coolant flow and cause overheating. Fill up and bleed the pumps in
the cooling circuit carefully as they can get damaged when run dry. Obey the
instructions of the external the cooling unit.

Converters with a customer cooling unit
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 (bleeding valve is G422).
•
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.