Instruction book
909935AIB
23
3
Touch controller
3.1 Controller
The ES4000T Touch controller
Introduction
The controller has following functions:
• Controlling the unit
• Protecting the unit
• Monitoring components subject to service
• Automatic restart after voltage failure (ARAVF)
Automatic control of the unit
The controller maintains the net pressure between programmable limits by automatically loading
and unloading the unit (fixed speed units) or by adapting the motor speed (units with frequency
converter).
A number of programmable settings, e.g. the unloading and loading pressures (for fixed speed
units), the setpoint (for units with frequency converter), the minimum stop time, the maximum
number of motor starts and several other parameters are taken into account.
The controller stops the unit whenever possible to reduce the power consumption and restarts it
automatically when the net pressure decreases. If the expected unloading period is too short, the
unit is kept running to prevent too short standstill periods.
A number of time based automatic start/stop commands may be programmed. Take into
account that a start command will be executed (if programmed and activated), even after
manually stopping the unit.