ABB ACS880-304LC Series, Руководство по оборудованию, Страница: 39 / 178

Cabinet temperature supervision
In liquid-cooled drive systems, the cabinet can be totally sealed from the ambient air.
The air inside the cabinet must be able to circulate freely. You can install a fan inside
the cabinet to push air through a heat exchanger.
You can use thermal switches [F6.11, F6.12] to supervise the temperature inside the
cabinet. Install the thermal switches on the hottest element of the cabinet. In this
example, the thermal switches are on the DC busbar above the supply module (two
thermal switches for 1×D8D and 2×D8D modules on the DC+ and DC- busbars). ABB
recommends to use thermal switches with 100 °C temperature limit.
Wire the switch to a digital input (DI) of the supply control unit (1 = OK,
0 = overtemperature). In case of overtemperature, the switch opens and the control
program generates first a warning, and then, if the overtemperature indication remains
over a predefined delay, trips the supply unit on a fault. You can adjust the delay time
by parameters. For the example wirings, see the example circuit diagrams.
Note: If you install the switches on the busbars, make sure there is proper insulation
between the busbars and thermal switches.
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