ECKELMANN VS 3015 CT, Инструкция по эксплуатации, Страница: 70 / 219

Firmware V1.41 V1 08.11.2022 70/219
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5.6.8 Control Algorithm tG with Stage Combined Control
The gas cooler outlet temperature measured via an A/D converter is compared with the setpoint. The following
applies:
A speed setpoint, depending on the control error, is calculated using a PI control algorithm that is switched to
the speed controller via an analogue output (0-10 V). The fan regulation is performed using a fan that is
controlled by a speed controller. Other stages connected to the mains power supply can be switched on or off
individually.
Depending on the expansion stage of the controller, the following numbers of fan stages can be controlled:
Fan Control via Modbus : 11 fan stages
Fan control via relays, requiring one SIOX extension module: 3 fan stages
With fan combined control, the possible fan configuration, depending on the expansion stage, is accordingly
one fan less than with step control. This is due to the fact that the fan output after the last configured fan output
(
No. cond.stages xx , menu 3-1) is used for the switching to the operation by power supply:
In the case of positive control error, the speed controller is enabled via the first capacity stage of the controller.
A speed setpoint, depending on the control error, is calculated by a PI control algorithm which is activated on
the speed controller via an analogue output (0-10 V). If the speed reaches its maximum value, a further
capacity stage is activated after a time delay.
The input signal for the first fan stage is reduced to the minimum speed. Fans which have been shut down via
the motor cut-out will be ignored by the controller.
If the gas cooler outlet temperature has reached a specified limit value (parameter
t
G
-Max./ t
G
-Max.HRC , menu
3-2-2-1), mains power operation is activated. The speed controller is disabled under mains power operation.
Afterwards, the fan is disconnected from the speed controller and switched to mains power.
Power supply bridging is carried out by activating the controller fan stage
(No. cond.stages + 1) and disabling
the first capacity stage (Freigabe Drehzahlsteller). Using the fan stage (No. cond.stages + 1), a bypass can be
activated which switches the speed controlled fans to mains power operation (see also chapter Start-up of
speed-controlled condenser fans / compressors ).
The following diagram shows the speed sequence for starting using the example of a system with five fans: