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9.
Close the bleed valve at the cooling unit.
10. Continue to fill in coolant until a base pressure of approximately 250 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.
13. Start the coolant pump. Let any air remaining in the system out through the bleed
valve at the cooling unit.
14. After one to two minutes, stop the pump or block the coolant flow with a valve.
15. Re-check the pressure and add coolant if necessary.
16. Repeat steps 13...15 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.
Draining the internal cooling circuit
The modules in each cubicle can be drained through the drain valves without draining
the whole internal cooling circuit.
WARNING!
Hot, pressurized coolant can be present in the cooling circuit. Do not work on
the cooling circuit before the pressure is released by stopping the pumps and
draining coolant.
1.
Attach hoses to each drain valve in the cubicle to be drained. Lead the hoses into
a suitable container. Make sure the ends of the hoses are not immersed in coolant
at any point so that air can displace the coolant in the system.
2.
Open the drain valves. Wait until all coolant has drained.
Note: Draining coolant into the sewer system is not allowed.
3.
If required, dry the piping with compressed oil-free air of less than 6 bar.
4.
If the drive is to be stored in temperatures below 0 °C (32 °F),
•
dry the cooling circuit with air,
•
fill the cooling circuit with coolant specified under
specification (page
•
drain the cooling circuit again.
Maintenance intervals
As a general rule, the quality of the coolant should be checked at intervals of two years.
This can be done by distributors of Antifrogen® L (see www.clariant.com) if a 250
milliliter sample is provided.
156).
Internal cooling circuit 155
Coolant
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