ECKELMANN VS 300 - Function of VS 300

Function of VS 300
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Doku-Version 2.05 - Firmware 2.10 - 15. September 2017
4 Function of VS 300
4.1 System Configuration
The VS 300 Pack Controller contains two control loops that can be configured optionally as a low-pressure (LP,
compressor control) or high-pressure loop (HP, fan control). Two different temperature ranges (NT = normal-tem
perature refrigeration or LT = low-temperature refrigeration) are provided for compressor control. The two control
loops can optionally act on two separate or one common refrigerant circuit (see section 2 Application).
An analog input for connection of a pressure transducer (4-20 mA current output) is assigned to each control
loop. Depending on the expansion stage, a total of 4, 8 or 12 relay/control stages is available for the two control
loops. An 0-10 V analog output is additionally assigned to each control loop with continuous control (speed or
combined control).
4.1.1 System design – Allocation of relay/control stages
Depending on the expansion stage, the VS 300 has 4, 8 or 12 relay/control stages that can be used to control
S compressors
S fans
S Alarm calling device (e.g. telephone dialling equipment)
These relay/control stages can be split at random between the two control loops and the telephone dialling
equipment.
Alternatively, all relays can be assigned to one control loop and the system operated with only one pressure
transducer. This requires the number of base load stages of one control loop to be set to 0 (G
x
=0; x = either
CL1 or CL2).
The following six parameters (see section 7 Parameter List and Menu Structure) are used to allocate the relay/
control stages of the VS 300:
G
CL1
: Total number of base load stages, Control Loop 1
(compressors with and without capacity control)
L
CL1:
Number of capacity stages each capacity-controlled base load stage, Control Loop 1
(= 1 for compressors without capacity control)
B
CL1
: Number of capacity-controlled base load stages, Control Loop 1
(= 0, when using only compressors without capacity control)
G
CL2
: Total number of base load stages, Control Loop 2
(compressors with and without capacity control)
L
CL2
: Number of capacity stages each capacity-controlled base load stage, Control Loop 2
(= 1 for compressors without capacity control)
B
CL2
: Number of capacity-controlled base load stages, Control Loop 2
(= 0, when using only compressors without capacity control)
AL: Number internal alarm relais