ABB ACS880-204LC, Hardware Manual

Page: 176 / 278

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 176) .
• 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.
Technical data
￭ Coolant specification
Coolant type
Antifrogen® L (by Clariant International Ltd, www.clariant.com ) 25% or 50% water mixture,
available from Clariant distributors and ABB Service representatives.
Antifrogen® L 25% mixture is usable in storage temperatures down to -16 °C (3.2 °F).
Antifrogen® L 50% mixture is usable in storage temperatures down to -40 °C (-40 °F).
Note that operation below 0 °C (32 °F) is not allowed regardless of the freezing point of the
coolant.
WARNING!
The warranty does not cover damage occurring from use of improper coolant.
￭ Temperature limits
Ambient temperature: See the technical data of the drive/unit.
Freeze protection: The freezing point of the coolant is determined by the concentration of
heat transfer fluid in the mixture.
176 Internal cooling circuit