True Power Monitoring Relays

The extensive range of true power monitors is used to provide an indirect measurement of physical values, i.e. it is simple to use the true power to draw conclusions about values such as volume, levels or pressure. This economical solution requires no additional sensors.

True power monitoring
S1WP

True power converter for single and three-phase supplies, used to measure and monitor the rated power or true power on electrical machines.

Features:
• 9 different measuring ranges
• Large voltage measurement range
• Analogue output can be switched for current and voltage
• Relay output for monitoring underload or overload
• Suitable for use with frequency-controlled motors
• Suitable for current transformers

True power monitoring
P1WP3

True power converter for single and three-phase supplies with analogue true value output

Features:
• Direct measurement of motors with 2.2 kW (400 V) rating
• Analogue output 0 ... 20 mA and 0 ... 10 V
• 2-phase current measurement (Aron circuit)
• Short reaction times
• High level of accuracy
• Suitable for current transformers
• Suitable for use with motors and generators

True power monitoring
P1WX-IBS

The P1WX-IBS can be used to monitor pumps, tools, fans etc. with regard to function, contamination or wear and tear, i.e. via the true power it has an indirect link to the status of a plant or machine. For example, if the true power of a pump motor is being monitored, the level of that true power can be used to draw conclusions about flow rate or fluid levels.

Three threshold values can be evaluated, so an early warning can be generated if there is any change in the true power. These thresholds can be established via a teach-in mode or can also be amended dynamically via Interbus. In addition to its use on DC, three-phase and AC motors, the P1WX-IBS is also suitable for monitoring frequency-controlled motors. The Interbus connection means that threshold or measured values can be amended online. The true power monitor can also be installed wherever is most suitable, it is not tied to a particular location.

Features:
• Communication via Interbus (in accordance with DIN E 19258), remote bus, RS 485
• Slave connection
• Polls true power, apparent current, voltage, diagnostic and statistical data via the controller
• Currents can be measured in 4 different measuring current ranges
• Large voltage measurement range
• Suitable for use with frequency-controlled motors
• Measurement principle: Aron circuit
• Suitable for current transformers

Please click on the links in the "For More Information" box to the right for additional information.