Function of VS 300
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Doku-Version 2.05 - Firmware 2.10 - 15. September 2017
S Booster operation:
In the booster stage, the refrigerant pressure from the frozen food cases, which due to the lower evaporation
temperature is also lower, is raised to the pressure of the suction lines of the normal temperature refrigeration
points.
If all the NT compressors are at stillstand and LT compressors are activated, the first NT compressor is acti
vated immediately following the overshoot of the setpoint plus half of the neutral zone, i.e. the switching times
are ignored. The switching times are ignored by the first compressor. Every additional NT compressor is acti
vated following the elapse of the basic and the variable preconnection time. If the suction pressure sinks in the
NT zone, then the NT compressor is turned off following the elapse of the basic and variable reset time. One
compressor remains operative, independent of the suction pressure. Only after all the LT compressors have
been switched off is the remaining NT compressor still being controlled finally switched off.
Regelkreis 2
ZNR. 51203 52 330
VS 300
RK 2RK 1
ND
NK
Regelkreis 1
ND
NK/TK
0NK
p
0NK/TK
p
von NK-Kühlstelle
NK-Kühlstelle
von NK/TK-Kühlstelle
NK/TK-Kühlstelle
Parameterisation of the booster / satellite operation:
If both of the VS 300 control circuits are configured as LP controllers, i.e. one of the following configurations is
selected (see following table), then it is possible to select whether the compressors in control circuits 1 and 2
operate independently of one another (satellite operation) or whether the compressors from control circuit 2 can
only be switched off following the disabling of all the compressors from control circuit 1 (booster operation). This
can be set using the parameter DisabCL2 w. CL1.
Possible controller configuraion for booster- / satellite operation:
Integral operation
VS 300 LED display
Display
AL 300 or CI 3000
Control loop 1 is: Control loop 2 is:
0 LTLT LT LT
1 LTNT LT NT
2 NTNT NT NT
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