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 Coolant specification (page 147).
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.
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 to 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 Coolant specification (page 147).
• drain the cooling circuit again.
146 Internal cooling circuit
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