ABB ACS880-304LC Series, Руководство по оборудованию, Страница: 114 / 178

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 114) .
• 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% mixture,
available from Clariant distributors and ABB Service representatives.
Note: Do not dilute the coolant. It is ready to use.
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 permitted regardless of the freezing
point of the coolant.
WARNING!
The warranty does not cover damage that occurs from the use of incorrect
coolant.
￭
Temperature limits
Freeze protection: The freezing point of the coolant is determined by the concentration
of heat transfer fluid in the mixture.
114 Internal cooling circuit