ABB ACS800-17LC, Hardware Manual, Page: 144 / 182

Internal cooling circuit
138
Connection to a cooling unit
Connection to an ACS800-1007LC cooling unit
Refer to the ACS800-1007LC Cooling Unit User’s Manual (3AFE68621101,
English).
Connection to a custom cooling unit
General requirements
Equip the system with an expansion tank to damp pressure rise due to volume
changes when the temperature varies. Keep the pressure within the limits specified
in
Specifications below. Install a pressure regulator to ensure that the maximum
permissible operating pressure is not exceeded.
Install a bleed valve at the highest point of the cooling circuit.
The materials used in the cooling system are listed in Specifications on page 141 .
Coolant temperature control
The temperature of the coolant in the internal cooling circuit must be kept within the
limits specified in
Specifications on page 141 . Note that the minimum temperature is
dependent on ambient temperature and relative humidity.
The following diagram shows an example of coolant temperature control using the
three-way valve in the external cooling circuit. Part of the infeed coolant flow is
directed into the return pipe through a three-way valve without letting it circulate in
heat exchanger if the coolant in the internal circuit is too cold.
Installation
Lay liquid piping with extreme care. Secure the pipes properly mechanically and
check for leaks.
Infeed
Bypass valve
TC
Return
External circuit Internal circuit
Heat
exchanger