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ABB i-bus KNX
4.1.2.1
Fan in a two-way
connection
4.1.2.2
Fan with speed
switching
© 2010 ABB STOTZ-KONTAKT GmbH
Planning and application
Control of a fan is usually implemented with a changeover switch.
The following control table results for a three speed fan, which simulates
the FCA/S with a group of switch outputs:
Output 1
0
OFF
1
Fan speed 1
0
Fan speed 2
0
Fan speed 3
In some cases the fan is controlled via a step switch. The following control
table results for a three-speed fan, which simulates the FCA/S with its
outputs:
Output 1
0
OFF
1
Fan speed 1
1
Fan speed 2
1
Fan speed 3
The step switch cannot be switched on rapidly. If for example, fan speed 3 is
to be switched on from the OFF state, fan speeds 1 and 2 must be controlled
with the associated dwell times first.
Output 2
Output 3
0
0
0
0
1
0
0
1
Output 2
Output 3
0
0
0
0
1
0
1
1
123
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