KGL Operating Manual – VS 3010 BS
2018-07-02
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Control sequence
SSSF
Fan stage:
F1
S1
F2
S2
F3
S3
Star / Δ
S4
Shifting up
All fans OFF
●
Fan 1 slow speed / Fans 2 and 3 OFF
●
●
Fans 1 and 2 slow speed / Fan 3 OFF
●
●
●
Fans 1, 2 and 3 slow speed
●
●
●
●
Fans 1, 2 and 3 fast speed
Shifting down
All fans OFF
●
●
●
Fans 1, 2 and 3 slow speed
●
●
Fans 1, 2 slow speed / Fan 3 OFF
●
Fan 1 slow speed / Fans 2 and 3 OFF
All fans OFF
The time delay for the switching from delta to star operation can be set using the parameter Del. slow speed
(menu 3-2-2-1). In the SSFF and SSSF operating modes, the switching to fast speed during night operation
can be disabled to prevent noise using the parameter Fast speed N (menu 3-2-2-1). If the condensation
temperature exceeds the setpoint specified in tc-max Z1 (Menu 3-2-2-1), the fast speed is loaded
independently from the parameter described above. The fans do not switch back to the slow speed again until
the capacity stages are shifted down due to the falling pressure.
4.5.6 Regulation of the fan speed with continuous control
In the case of a positive control error, a speed setpoint is calculated using a PI control algorithm that is
activated on the speed controller via an analogue output (0-10 V). The speed controller regulates the fan
speed to the specified setpoint.
In the case of a negative control error, the speed controller is disabled using the first fan output F1 of the pack
controller if the speed has reduced to 0. If a minimum speed > 0 of the speed controller has been input using
the parameter Min. Fan speed (menu 3-2-2-1), the speed is reduced after a configurable time (parameter
basetime OFF Fan 1) to 0 using a ramp and the fan output L1 is switched off.