ECKELMANN VS 3000 User Manual

Version 2.02 15.05.2007
Function of VS 3000
19
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3.17.1 Base load rotation with variable-speed compressors
In systems equipped with variable-speed compressors the first two compressors (C1 and C2) can be assigned to a
speed adjuster. Additional fixed-speed compressors (C3 - Cn) can also be controlled. Base load rotation of fixed-speed
compressors (C3 - Cn) takes place as described above in Section 3.17.
At the end of the cycle time, or when all compressors are shut down, compressors that can be assigned to the speed
adjuster (C1 and C2) are alternately switched to the s peed adjuster by a digital output of the VS 3000 according to the
following sequence.
Base load rotation with two compressors running
(C1 and C2)
Base load rotation with one compressor running (C1 or C2)
Reduce speed to minimum
Stop fixed-speed compressor
Reduce speed to zero Reduce speed to zero
Stop variable-speed compressor Stop variable speed compressor
3 seconds time delay 3 seconds time delay
Rotate base load compressor Rotate base load compressor
3 seconds time delay 3 seconds time delay
Start fixed-speed compressor
Start variable speed compressor Start variable s peed compressor
Increase actuating signal (0 to 10 V) by 2 V/s until speed
prior to rotation is obtained
Increase actuating signal (0 to 10 V) by 2 V/s until speed prior
to rotation is obtained
No compressor rotation takes place when the cycle time for base load rotation is set to --- even when all com-
pressors are stopped. When cycle time is set to ---, the digital output signal for rotation will preserve the status
at the time the data is entered even after an electric power failure.
In the event of a fault (motor overload or oil pressure cutout) on the variable-speed compressor (C1 or C2), base
load rotation takes place only once to the then available fixed-speed compressor. No base load rotation will take
place if the failed compressor is a fixed-speed machine.
Fault: Base load rotation output Base load rotation
performed
Compressor 1
ON NO
OFF YES
Compressor 2
ON YES
OFF NO

ECKELMANN VS 3000 Specifications

General

Brand	ECKELMANN
Model	VS 3000
Category	Controller
Language	English