Steuerschrank für Pumpen

The connection of the pumping unit to the electrical network should be carried out through a panel that performs the functions of protection and control of pumps.

The illustration shows a basic diagram of a control panel for two pumps installed in the circulation loop of the heating system, with a minimum set of functions for protection and automation of the pumping unit.

Protection

The pump control panel should provide the following basic protection:

• Dry run protection - the pump is switched off when the pressure in the suction pipe falls below the set value.
• Phase voltage unbalance protection - power supply to the pump is switched off in case of unacceptable phase voltage unbalance.
• Motor overload protection (thermal protection) - activated in case of shaft blockage and overload.

Control

Depending on the technological process conditions, the control panel may implement the following automation functions:

• Manual and automatic control depending on various conditions.
• Activation of a backup pump in case of failure of the working one.
• Automatic switching of operation from a backup to a working pump, thus ensuring even load and wear.
• Cascade pump activation based on a time schedule or deviation of a controlled parameter (such as flow rate or pressure) from a set value.
• Maintaining a constant flow rate, pressure or head behind the pump is achieved by installing a frequency controller.
• Blocking the pump start-up when the set frequency of activation is exceeded or depending on other conditions.

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