“Pressure control” operating principle

In automatic mode, the system maintains the specified pressure. As soon as the pressure in the tank falls below the set pressure, the pumps are switched on. When the pressure in the tank exceeds the set pressure again, the pumps are switched off. If two pumps are connected, pump cycling is carried out every time the pump is switched off to optimise the pump running times.

An alarm signal is shown on the LCD display in case of a fault. If more than one pump is connected, automatic changeover to a fully-functional pump occurs. The internal buzzer can emit an audible alarm signal. Furthermore, the outputs for the collective fault signal (SSM) and individual fault signal (ESM) are activated. The output for the external alarm signal is activated in parallel to the collective fault signal output. This can also be used to control an external alarm.

Monitoring for the dry-running level works as follows:

• Dry-running protection system
• Monitoring always refers to the fill level on the pump. If the water level falls below the dry-running level, the pump(s) undergo(es) forced switch-off.

An alarm signal is also shown on the LCD display. The internal buzzer can emit an audible alarm signal. Furthermore, the output for the collective fault signal (SSM) is activated. The output for the external alarm signal is activated in parallel to the collective fault signal output. This can also be used to control an external alarm.