ABB ACS6080 - Water cooling unit (WCU)

POWER ELECTRONICS AND CABINET FEATURES
PRODUCT
ACS6000
DOCUMENT KIND
User manual
DOCUMENT ID.
3BHS212794 E01
REV.
N
LANG.
en
PAGE
58/266
3.2.6. Water cooling unit (WCU)
The closed-loop water-cooling system transfers the heat losses of the main power
electronics components of the drive (eg, rectifier bridges, inverter phase modules,
DC-link capacitors) to the exterior.
Redundant pumps circulate the coolant through the feeding pipes to the power
electronics components and transfer the heat losses through the return pipes and
the water-to-water heat exchanger.
The water cooling units are accessible for maintenance even when the drive is in
operation.
For more information, see:
– “ACS5000, ACS6000 and ACS6080 water cooling unit WCU800 user manual”
(3BHS821937 E01)
– “ACS5000, ACS6000 and ACS6080 water cooling unit WCU1400 user manual”
(3BHS835714 E01).
Table 3-4 Main components in a WCU cabinet
Component Description
Swing frame Contains the auxiliary power supply switch, the pump motor
starters and digital and analog I/O modules for controlling and
monitoring the water-cooling circuit.
Control and
monitoring devices
Measure the temperature, pressure and conductivity of the
coolant. A solution based on a double-sensor configuration is
available as an option, to guarantee full operation in case of
single sensor failure.
Water pump Circulates the coolant through the internal cooling circuit. The
standard solution is based on redundant pumps (one of the two
pumps is always on standby and starts automatically if the
running pump fails).
An alternative solution based on one pump is also available.
Water-to-water
heat exchanger
Transfers the heat from the internal cooling circuit to the
external cooling circuit.
Expansion vessel Used for pressure compensations
Ion exchange vessel The ion exchange vessel in the water treatment circuit deionizes
the coolant of the internal cooling circuit and maintains the
conductivity.
3-way valve The three-way valve controls the flow of the external cooling
liquid through the water-to-water heat exchanger.