KGL Operating Manual – VS 3010 BS
2018-07-02
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4.5.9.1 Setpoint calculation in normal operation
The calculation of the setpoint tc for the condenser temperature depends on the temperature outside.
t = t setpoint
c
c
t
= maximum t setpoint
c_max
c
t
= minimum t setpoint
c_min
c
t = current temperature outside
a
t
= max. temperature outside for setpoint shift
a_max
t
= min. temperature outside for setpoint shift
a_min
t
, t
, t
, t
can be parametrised.
c_min
a_min
c_max
a_max
The temperature outside is provided either by a Pt1000 sensor connected to terminals (1/2/3/4) or via the CAN
bus from another pack controller in the system. In addition to the tc-setpoint calculated above, a temperature
offset
can be added when setpoint shift is active (digital input 20
). This can be
tc-Offset N
- terminals 88/90
set in menu 3-2-2-2.
4.5.10 Condenser fan control times with step controller
If the condensation pressure rises or falls to a value outside the neutral zone, the first condenser capacity
stage is immediately loaded or unloaded. Any further switching is only performed if a specific time for the flow
or return has elapsed and the control error has exceeded a specified value (neutral zone).
The time depends on the actual control error. In the case of large control error, the switching is performed after
a shorter time than for smaller control errors. The run time is calculated from the sum of a basic time tb and a
variable time tv. A distinction is made between shifting up and shifting down of the step controller.
The variable time is inversely proportional to the control error. In the case of maximum control error, the
