Firmware V1.41 V1
08.11.2022
69/219
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speed controlled fans to mains power operation (see also
Start-up of speed-controlled condenser fans /
The following diagram shows the speed sequence for starting using the example of a system with five fans:
In the case of a negative control error, the speed of all loaded fans is reduced to the minimum speed + 20%.
If the gas cooler outlet temperature remains below the setpoint, fan stages are switched off at intervals.
Switching back from mains power operation to controlled operation is not performed until the t
G
setpoint has
been undercut.
Finally, the speed controller is disabled via the first fan output S1 of the controller when the speed has reduced
to 0. If a minimum speed > 0 of the speed controller has been input using the parameter
Min. Drehzahl
(menu
3-2-2-1), the speed is reduced after a configurable time (parameter
B. unlo T F1
menu 3-2-2-2-c) to 0 using a
ramp and the fan output S1 is switched off.
Enable fan stages (parameter
ENABL.COND
screen 3-1-e)
The enable of the fan stages is directly assigned to the fan relay stages. Using a disable of the fan stage 1, the
speed controller with the connected fans can thus be disabled. If the first stage is disabled, the fan controller
operates as a step controller with the steps 2 to n-1.
The following maximum numbers of stages can be disabled or enabled:
Fan control via relays, requiring one SIOX extension module: 3 fan stages
Fan Control via Modbus : 11 fan stages
The stage
No. cond. 1
cannot be programmed for operation by power supply. It is not displayed on the
operator terminal, the store computer and in the LDSWin PC software.