KAESER BSD 50 User Manual

Both oil temperature regulators are equipped with working elements that ensure trouble-free func‐
tioning of the cooling and heat recovery systems.
Fig. 8 Internal heat recovery (option W2/W3)
1 Plate-type heat exchanger
4.5 Operating modes and control modes
4.5.1 Operating modes
The machine operates in the following modes:
■ LOAD:
The inlet valve is open. The airend delivers compressed air to the distribution network.
The drive motor runs under full load.
■ IDLE:
The inlet valve is closed. The minimum pressure/check valve shuts off the oil separator from the
distribution network. The oil separator tank is vented.
A small volume of air circulates through the bleed hole in the inlet valve, through the airend and
back to the inlet valve via the venting valve.
The compressor motor runs without load and draws little current.
■ STANDSTILL:
The inlet valve is closed. The minimum pressure/check valve shuts off the oil separator from the
distribution network. The oil separator tank is vented.
The compressor motor is stopped.
■ MODULATING CONTROL:
With the help of a control valve (the proportional controller) the degree of opening of the inlet
valve is steplessly varied in response to the air demand. The airend delivers compressed air to
the distribution network.
The load and power consumption of the drive motor rises and falls with the air demand.
The regulating valve is factory set. The setting should not be changed without consultation with
KAESER SERVICE.
4.5.2 Control modes
In order to maintain system pressure between the set minimum and maximum values and to com‐
pensate for the compressed air drawn at any time, the controller will switch the compressor motor
between the various operating states according to specific rules (specified by the control mode). The
control mode also rules the degree of energy efficiency of the machine.
SIGMA CONTROL can work in the following control modes:
■ DUAL
■ QUADRO
4 Design and Function
4.5 Operating modes and control modes
9_5708 08 USE
Service Manual Screw Compressor
BSD
29
Option C1

KAESER BSD 50 Specifications

General

Model	BSD 50
Category	Rotary Screw Compressor
Motor Power	30 kW
Noise Level	69 dB(A)
Drive Type	Direct