Produkt.pm6.5 - USA
Page 2.10
Product description
BOGE Operating instructions for S 40-2...S 341 / SF 40-2...SF 220 series screw compressors
2.4 Control devices
Proportional controller
(option for S-series)
Operating pressure
transmitter
1
The operating pressure transmitter controls the operation of the compres-
sor within the set switching limits.
Switch-on pressure p
min
If the network pressure drops to the set switch-on pressure p
min
, the compres-
sor switches on.
Switch-off pressure p
max
If the network pressure increases to the switch-off pressure p
max
, the compres-
sor either switches off (intermittent operation) or switches to idling operation
(continuous operation).
The proportional controller is an additional control device intervening in the
sequences of the intake regulator.
The intake regulator only opens as far as necessary to supply the current
compressed air requirement. Thus the compressor saves compression
energy.
A compressor with proportional controller is able to supply its ’delivered
quantity variable between 0% and 100%. However, the energy consumption
does not reduce accordingly. Therefore, a control is only practical between
50% and 100% of the delivered quantity.
The proportional controller is factory set to a delivered quantity between
50% and 100% of the compressor capacity.
The proportional controller closes when the desired delivered quantity has
dropped below 50% of the compressor capacity. The compressor then oper-
ates in idling operation (continuous operation) or switches off (intermittent
operation).
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