1. Grundfos RSI
The Grundfos RSI contains a preloaded Grundfos
motor library for instant use.
1.1 Specific functions of Grundfos RSI
The dedicated application software was developed to
drive a Solar Pump with an optimized MPPT
(Maximum Power Point Tracking) for RSI supplied by
Solar Panels.
The MPPT is based on 4 parallel algorithms:
• Feed-Forward Controller (to follow the radiation
variations)
• Correction Controller (to compensate the
temperature variations)
• Oscillation Damping Regulator (to prevent the
panel entering in the "current source" branch of
the characteristic)
• Local Maxima logic (to prevent the regulator from
being trapped in a local maximum lower than
absolute maximum)
Features
• The MPP Tracker controls DC voltage reference
in order to find the maximum power.
• Extensive wizards for start-up, PID-control used to
facilitate commissioning
• "Funct" button for easy change between Local
(keypad) and Remote control place. The remote
control place is selectable by parameter (I/O or
Fieldbus)
• 8 preset frequencies
• Motor potentiometer functions
• 2 programmable ramp times, 2 supervisions and 3
ranges of prohibited frequencies
• Control page for easy operation and monitoring of
the most essential values.
• Fieldbus data mapping
• Automatic reset
• Different pre-heat modes used to avoid
condensation problems
• Maximum output frequency 320 Hz
• Real-time clock and timer functions available
(optional battery required). Possible to program 3
time channels to achieve different functions on the
drive (e.g. Start/Stop and Preset frequencies)
• External PID-controller available. Can be used to
control e.g. a valve using the AC drive I/O
• Sleep mode function which automatically enables
and disables drive running with user defined
levels to save energy.
• 2-zone PID-controller (2 different feedback
signals; minimum and maximum control)
• Two setpoint sources for the PID-control.
Selectable with digital input
• PID setpoint boost function
• Feedforward function to improve the response to
the process changes
• Process value supervision
• Maintenance counter
• Underload protection can be managed by
measuring Motor torque (standard sensorless
mode) or by measuring the water flow with a flow
meter sensor. This sensor can be an analogue
signal or a digital input. With this sensor it is
possible to measure the water flow [litres/min] and
the total volume of the water flow [m
3
].
• Sleep mode can be enabled or disabled with a
parameter.
• Digital inputs can be used to measure water levels
(minimum and maximum).
5
English (GB)
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