KAESER ESD 352 SFC, Техническая документация инструкция

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■ The drive motor is stopped.
■ The inlet valve is closed.
■ The minimum pressure/check valve shuts off the oil separator from the air distribution network.
■ The venting valve is open.
The compressor motor starts as soon as system pressure is lower than the set point pressure (cut-
off pressure).
In addition, timing and/or remote control may affect the start of the motor.
LOAD
The compressor motor runs under load.
■ The inlet valve is open.
■ The airend delivers compressed air to the air distribution network.
IDLE
The compressor motor runs unloaded with low power consumption.
■ The inlet valve is closed.
■ The minimum pressure/check valve shuts off the oil separator from the air distribution network.
■ The venting valve is open.
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 line.
4.7.2 Control modes
Using the selected control mode, the controller switches the machine between its various opera‐
tional states in order to compensate for air being drawn off by consumers, and to maintain the sys‐
tem pressure between the set minimum and maximum values. The control mode also rules the de‐
gree of energy efficiency of the machine.
The machine-dependant venting phase between the LOAD and READY operating modes ensures
load changes at minimum material stresses.
The controller SIGMA CONTROL 2 can operate in the following modes:
■ DUAL
■ QUADRO
■ VARIO
■ DYNAMIC
■ MODULATING control
DUAL
In the DUAL control mode, the machine is switched back and forth between LOAD and IDLE to
maintain the machine working pressure between the preset minimum and maximum values. When
maximum pressure is reached, the machine switches to IDLE. When the preset
idling time has
elapsed, the machine is READY.
The
idling time is factory preset according to the maximum starting frequency of the compressor
motor. The shorter the
idling time setting, the sooner (and more frequently) the drive motor is stop‐
ped.
4 Design and Function
4.7 Operating modes and control modes
9_9450 03USE
Service manual Controller
SIGMA CONTROL 2 SCREW FLUID 1.1.3
31
Option C1