KGL Operating Manual – VS 3010 BS
2018-07-02
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43 178
The menu is only displayed if the high-pressure is controlled using a step controller (menu 3-2-2-1).
The fan stages are loaded or unloaded one after the other with the Direct switching mode. The fans are also
loaded one after the other with the SSFF switching mode. This results in the first half of the outputs loading the
fans at slow speed (star operation). The second half of the outputs switches the fans to the fast speed (delta
operation). When shifting down the capacity stages, both fan outputs (star and delta outputs) are unloaded
simultaneously. The slow speed is loaded again after a configurable time delay.
The following table shows the control of the fan outputs using the example of a system with two fans and four
fan stages:
Control sequence
SSFF
Fan stage:
F1 star
S1
F2 star
S2
F1 Δ
S3
F2 Δ
S4
Shifting up
Fan 1: OFF / Fan 2: OFF
●
Fan 1: slow speed / Fan 2: OFF
●
●
Fan 1: slow speed / Fan 2: slow speed
●
●
●
Fan 1: fast speed / Fan 2: slow speed
●
●
●
●
Fan 1: fast speed / Fan 2: fast speed
Shifting down
●
●
Fan 1: fast speed / Fan 2: OFF
●
●
●
Fan 1: fast speed / Fan 2: slow speed
●
Fan 1: OFF / Fan 2: slow speed
●
●
Fan 1: slow speed / Fan 2: slow speed
●
Fan 1: slow speed / Fan 2: OFF
Fan 1: OFF / Fan 2: OFF
The fans are also loaded one after the other with the SSSF switching mode. This results in all fans being
loaded at slow speed (star operation). Afterwards, all fans are switched to the fast speed (delta operation). All
fan outputs are unloaded simultaneously when shifting down the capacity stages. Afterwards, all fans are
loaded again one after the other at the slow speed after a configurable time delay. After this, the slow speeds
are unloaded one after the other. The following table shows the control of the fan outputs using the example of
a system with three fans and four fan stages:
