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5.7 Switching Sequence
When the automatic c/k identification is
switched on every optional switching
sequence is possible.
Necessary condition: When the optional
switching combinations are sorted
according to their capacity, the capacity
difference between two successive
combinations may only be 1.2 times the
capacity of the smallest stage.
If the automatic c/k identification is
switched off, the switching sequence
(switching programme) can be reset to the
following combinations of capacitor
stages:
1:1:1:1:1:1 1:1:2:4:4:4 1:2:3:4:4:4
1:1:2:2:2:2 1:1:2:4:8:8 1:2:3:6:6:6
1:1:2:2:4:4 1:2:2:2:2:2 1:2:4:4:4:4
1:1:2:3:3:3 1:2:3:3:3:3 1:2:4:8:8:8
The smallest capacitor stage is always "1",
the subsequent stages are either the
same (1:1:1...) or are larger. In the second
line above a more accurate result can be
achieved with the same number of switch-
ing contactors.
When the automatic c/k identification is
switched off, the smallest capacitor stage
("1") must be connected to the first control
output of the connecting terminal. All other
stages follow according to their capacity.
In the case of fixed stages being used, the
smallest stage has to be connected
following the last fixed stage.
5.8 Number of Contactors used
When the automatic c/k identification is
switched off, any value between 1 and 6
can be programmed. If, for example, there
are five stages in a capacitor bank, these
stages are connected to the control
outputs "1" to "5" and the number of the
control outputs is programmed to "5" in
order to prevent the control relay from
activating control outputs which have not
been connected.
The size of the capacitor stages has no
influence on this setting.
5.9 Specifying fixed Stages
The Control Relay RM 9606 allows the
first three control outputs to be treated as
fixed stages. Fixed stages are stages
which are not included in the normal con-
trol cycle but are switched on immediately
after the control relay is switched on and
always remain switched on. The set
discharge period is maintained. The target
power factor setting is ignored.
The following settings are possible:
0 = no fixed stages
1 = control output 1 is fixed
2 = control outputs 1 and 2 are fixed
3 = control outputs 1 to 3 are fixed
The switching sequence does not take into
account the fixed stages.
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