ABB ACS880-87LC-4000A/4021A-7, Hardware Manual

Page: 22 / 144

22 Safety instructions
Work on the liquid cooling system
These instructions are intended for all who are responsible for installation and
maintenance work of the liquid cooling system of the converter.
WARNING! Obey these instructions. If you ignore them, injury or damage to the
equipment can occur.
•
Beware of hot liquid. Do not work on the liquid cooling system until the pressure is
lowered down by stopping the pumps. High-pressure hot coolant (600 kPa,
over 50 °C/122 °F) is present in the internal cooling circuit when the converter is in
operation.
•
Before power switch-on, make sure that the internal cooling circuit is filled up with
coolant. Running the external cooling pump dry will damage it. Also the converter will
not cool down.
•
Avoid skin contact with coolant, especially antifreeze. Do not syphon them by mouth. If
such substance is swallowed or gets into the eyes, seek medical advice.
•
To avoid breaking the coolant pipes, do not overtighten the nuts of the unions.
•
Blue connectors: Leave 2…3 millimeters of thread visible.
•
Black connectors: Tightening torque is 10 N·m (7.4 lbf·ft) in
room temperature (20 °C/68 °F).
•
If the ambient temperature is below +5 °C (41 °F), add antifreeze and corrosion
inhibitors to the cooling liquid.
•
Drain the system before storing in temperatures below 0 °C (0 °F). Freezing of the
liquid cooling system is not allowed. Operation at liquid temperatures below zero is not
permitted, not even with antifreeze.
2...3 mm