ECKELMANN VS 3015 CT, Инструкция по эксплуатации, Страница: 31 / 219

Firmware V1.41 V1 08.11.2022 31/219
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Menu Parameter Description Input Default Dim.
3-2-1-4 NZ speed con. Neutral zone night operation combined
control
The parameter is only displayed if
compressor combined control is
configured. 1..6 0 K
Loading of fixed-speed compressors
Loading is performed when
the speed-controlled compressor has reached its maximum speed and
the suction pressure (t
0
-actual_value) has reached a value greater than the t
0
-setpoint plus half the value of
" NZ speed con." .
The switching on delays (base and variable switching on delay) also start when the suction pressure is greater
than the t
0
-setpoint plus half the value of " NZ speed con." .
Unloading of fixed-speed compressors
Unloading is performed when
the speed-controlled compressor has reached its minimum speed.
the suction gas pressure (t
0
-actual_value) has reached a value smaller than the t
0
-setpoint minus half the
value of " NZ speed con." .
The switching off delays (base and variable switching off delay) also start when the suction pressure is lower
than the t
0
-setpoint minus half the value of " NZ speed con." .
5.4.3.4 Compressor Control Times for Compressor Combined Control
On the one hand, the compressor control times are there to minimise unnecessary switching cycles of the
compressor stages, and on the other hand to optimally introduce the pack output (temporal and control action)
for the required refrigeration capacity.
Switching of fixed-speed compressors is only performed
if the control variable (to-actual_value) is outside the neutral zone
if a configured time for the supply or return has elapsed
if the maximum or minimum speed of the frequency-controlled compressor is reached
Loading of the frequency-controlled compressor
The frequency-controlled compressor has a separate, freely configurable restart delay time.
This is designated as Standstill time S1 and starts when the frequency-controlled compressor is switched
off.
In the case of positive control error, the frequency-controlled compressor is switched on immediately when
the Standstill time S1 has elapsed.
The flow or return time restarts in the neutral zone and only runs if the control variable is outside the neutral
zone.
The flow or return time is calculated from the sum of
basic time t
b
and
variable time t
v
Basic Time
The basic time can be configured and is always constant.
Variable Time
The variable time can be configured and is variable. The value range is between 0 and the configured value (in
seconds). The duration of the variable time is calculated depending on the control constant.
An example for this with a basic time of 20 seconds and a variable time of 200 seconds. The control constant is
parametrised to 10 K.