Studer Innotec SA
VarioString
User manual
41
measured open circuit voltage is multiplied by this ratio to calculate the operating point. (ex.: the
measured open circuit voltage is 500V, Ratio 0.7, the operating point will be 500x0.7=350V).
Upv fixed: with this mode the VarioString fixes the PV operating voltage and it does not vary.
PV voltage fixed {14177} (500 Vdc)
PV voltage fixed (for PV in series, VS-120) {14044} (700 Vdc)
PV voltage fixed (for PV in parallel, VS-120) {14179} (500 Vdc)
These parameters allow setting the voltage value at which you wish to set the operating point.
LSF (least square fitting): Improved MPPT (maximal power point tracking) algorithm. This algorithm
functions automatically and continuously searches for the optimal functioning of your system.
9.4.6.4.2
Type of MPP tracking algorithm PV1 {14176} (P&O) and Type of MPP tracking algorithm
PV2 {14046} (P&O)
Same as the preceding parameter but for when the PV1 and PV2 inputs are used independently on
the VarioString VS-120.
9.4.6.5
PV wiring type erased from memory {14190}
This parameter resets the type of PV wiring detected by the VarioString.
9.4.6.6
Configuration for VS-70 {14195}
9.4.6.6.1
Type of PV grounding {14196} (no control)
This parameter allows the VarioString to constantly verify the state of the PV grounding connection
during its use in series or parallel mode. In the event of an error, the VarioString will turn on a LED
indicator light (3). It is possible to ground either of the PV terminals.
9.4.6.6.2
Type of MPP tracking algorithm PV {14197} (P&O)
This parameter allows setting the type of algorithm used by the VarioString to establish its operating
point.
P&O: Maximum Power Point (MPP) search algorithm. This algorithm is fully automatic and searches
the MPP of your system.
OC ratio: With this mode, the VarioString makes an open circuit voltage measurement once every 5
minutes and fixes the working voltage at a point proportional to the measurement. The measurement
lasts 2 seconds.
Ratio of PV open circuit voltage {14199} (0.7)
This parameter fixes the operating point according to the measured open circuit voltage. The
measured open circuit voltage is multiplied by this ratio to calculate the operating point. (ex.: the
measured open circuit voltage is 500V, Ratio 0.7, the operating point will be 500x0.7=350V).
Upv fixed: with this mode the VarioString fixes the PV operating voltage and it does not vary.
PV voltage fixed {14198} (500 Vdc)
These parameters allow setting the voltage value at which you wish to set the operating point.
LSF: Improved MPPT (maximal power point tracking) algorithm. This algorithm functions automatically
and continuously searches for the optimal functioning of your system.
9.4.6.7
Remote entry (Remote ON/OFF) {14200}
9.4.6.7.1
Remote entry active {14201}
With this parameter it is possible to define if the remote entry is active "open", "closed" or on "rising edge".
In mode "open" or "closed" the chosen parameter's function will take place once the remote entry is
active. The function opposite to the parameter will be carried out when the remote entry is inactive.
In mode "rising edge" the standby state is an open contact. When a voltage pulse is applied, the
function of the chosen parameter takes place. The voltage pulse must be at least 200ms and at the
most 2s. By applying a second pulse the opposite function of the chosen parameter will take place.
Содержание VarioString VS-120
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