Studer VarioString User Manual page 36

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VarioString
8.4.6.3 Type of PV grounding {14041} (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 stops until the PV
grounding is re-established. It is possible to ground either of the PV terminals.
8.4.6.4 Type of PV1 grounding {14175} (no control), Type of PV2 grounding {14042} (no control)
The same as the preceding parameter, but for the MPPT inputs PV1 and PV2 in independent mode.
8.4.6.4.1 Type of MPP tracking {14043} (P&O)
This parameter allows setting the type of algorithm used by the VarioString to establish its operating
point in series or parallel cabling mode.
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 {14045} (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 (for PV in series) {14044} (700 Vdc)
PV voltage fixed (for PV in parallel) {14179} (500 Vdc)
These parameters allow to set the voltage value at which you wish to set the operating point.
8.4.6.4.2 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.
8.4.6.5 PV wiring type erased from memory {14190}
This parameter resets the type of PV wiring detected by the VarioString.
8.4.6.6 INSTALLER: Reset PV energy meter {14182}
This parameter allows you to reset the PV energy meter to zero. This could be useful if you wish to
measure the energy produced over a given time interval.
8.4.6.7 INSTALLER: Reset daily solar production meters {14051} and
8.4.6.8 INSTALLER: Reset daily min-max {14052}
These parameters allow you to reset to zero the different corresponding daily meters. This could be
useful if you wish to know these values precisely over a specific period of time.
8.4.6.9 Restore default settings {14067}
See basic parameters, chap. 8.4.4.4.
8.4.6.10 INSTALLER: Restore factory settings {14068}
See basic parameters, chap. 8.4.4.5
8.4.6.11 INSTALLER - Parameters saved in flash memory {14069} (yes)
This parameter allows you to determine if the parameters modified within your system should be
saved or not to the flash memory. With the objective to increase the useful life of the flash memory
in the case of repeated writing to it, this parameter should be deactivated (no), for example, if the
VarioString is piloted by an external control and supervision system, SCADA.
36 V 1.0 User manual