Version 2.02 15.05.2007 Function of VS 3000
12
The start and stop delay commences only outside the neutral zone.
Loading of a compressor stage takes place with the No. Running Compressors + 1 delay, unloading always
commences with the first-stage delay.
ZNR. 51203 64 230 E0
Control error dt [°C]
Run time [s]
VS 3000 Compressor run times
0
2
4
6
dt
8
10
dt max
12
0
20
40
60
80
100
120
140
120
160
180
200
220
240
t
v max
Basic time t
b
Runtimet=t +t
vb
t+t
v maxb
t
b
t
v
3.6 Calculating setpoint
3.6.1 Calculating setpoint by outdoor temperature
The t
0
setpoint is calculated as a function of room temperature (setpoint shift). Room (ambient) temperature is
supplied either by a PT1000 sensor connected direct to a pack controller input or via the CAN bus by another
pack controller in the system.
t
0
= t
0_min
+
t
0_max
− t
0_min
⋅
t
r
− t
r_max
t
r_min
− t
r_max
t
0
=t
0
setpoint
t
0_max
= Maximum t
0
setpoint
t
0_min
= Minimum t
0
setpoint
t
r
= Current room temperature
t
r_max
= Maximum room temperature for setpoint shift
t
r_min
= Minimum room temperature for setpoint shift
With a room temperature of t
r
>t
r_max
or t
r
<t
r_min
the setpoint t
0
is defined as a constant as follows:
For t<t
r_min
t
0
=t
0_max
For t>t
r_max
t
0 = t0_min
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