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Parallel combined control
Regulation using speed controller (continuous control). The high pressure control is performed here
using an analogue signal which specifies the required speed to the speed controller. The fans are all
connected in parallel to the speed controller, however they can be loaded or unloaded individually.
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Stages combined control
Combination of step controller and continuous control. The high pressure control is performed here by
enabling or disabling condenser capacity stages and using a speed-regulated fan.
5.6.1 Neutral zone fan control
Step control
If the gas cooler outlet temperature is within a configurable neutral zone, no switching of the fan stages is
performed.
Continuous control
When the combined control type of control is active (stages combined control or parallel combined control), the
neutral zone speed control (parameter
NZ speed con.
, see menu 3-2-2) affects the switching on and switching
off of the fixed-speed fans.
If the actual value of the fan controller is within the neutral zone speed control, no fixed-speed fan is switched
on or off.
The speed controller is enabled if the gas cooler outlet temperature exceeds the setpoint minus half the neutral
zone speed controller. The enable for the speed controller is withdrawn when the setpoint has been undercut
and the speed = Min. speed.
5.6.2 Control algorithm for fan control
The control algorithm depends on the type of control.
5.6.3 Control algorithm with step controller
If the gas cooler outlet temperature is increasing and outside the neutral zone, the step switch switches
forwards one stage. In the case of negative control error and dropping gas cooler outlet temperature, the step
switch, outside the neutral zone, switches back one stage. Fan stages are also disabled (provided this is
selected via the parameter
Fan off w/comp
(menu 3-3-1)) when all compressors are switched off.
Summary of Contents for VS 3015 C
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