5-25
U126
U127
PV panel specifications (PV panel open circuit voltage)
PV panel specifications (PV panel MPP voltage)
Function code U126 (PV panel open circuit voltage) is used to set the PV panel open circuit voltage.
Function code U127 (PV panel MPP voltage) is used to set the PV panel MPP voltage.
Both parameters are fundamental for the correct operation of the Solar Pumping inverter functions. The units of
both parameters are volts (DC). It is possible to set either the voltage than corresponds to a module or the value
that corresponds to the complete solar panel series configuration, but the same criteria must be used for both
U126 and U127.
U121
U123
U171
U135
UB88
MPP Search (Enable MPP search)
MPP search (Enable manual setting of PV panel voltage set point)
MPP search (Actual PV panel voltage set point)
MPP search (Voltage/PID set point increase/decrease step for MPP search)
MPP search (Time interval)
The maximum power operating point of the PV panel/s may change during the day due to changes of irradiance
and PV panel temperature. By setting to “1.00” function code U121 (Enable MPP search), the MPP search
(Maximum Power Point Tracking) function is enabled. When MPP search function is enabled the inverter will
change the value of the PV panel voltage set point (function code U171) at periodic intervals, to search the
maximum power operating point of the PV panel.
By setting to “1.00” function code U123 (Enable manual setting of the PV panel voltage set point), the manual
setting of the PV panel (DC link) voltage set point voltage is enabled. In this case the PV panel voltage must be set
manually in function code U171.
Function code U171 (Actual PV panel voltage set point) contains the current PV panel voltage set point value. If
U123=0.00 the value of U171 is automatically calculated by the inverter. If U123=1.00 the value of U171 should be
set manually. The units of U171 are in percentage (%), where 100% means 500 V in case of -2/-7 inverters and
1000 V in case of -4 inverters.
Function code U135 (Voltage/PID set point increase/decrease step for MPP search) is used to set the PV panel
voltage set point increase/decrease for 1 step of the MPP search (MPPT) function. The units of U135 are in
percentage (%), where 100% means 500 V in case of -2/-7 inverters and 1000 V in case of -4 inverters.
Function code UB88 (Time interval) is used to set in the time interval to execute the MPP search function since the
last execution or since the inverter started operation. The time units of this parameter are minutes.
U172
Measurement at open circuit voltage condition (affected by multiplication factor
U127/U126)
Function code U172 does not need to be set. It indicates the voltage measured at inverter stop condition or just
before inverter started to operate. The value of U172 is the result of the PV panel open circuit voltage measured (at
inverter stop condition) multiplied by the factor U127/U126. The units of this parameter are in percentage (%),
where 100% means 500 V in case of -2/-7 inverters and 1000 V in case of -4 inverters.
J15
U134
UD88
Sleep function (Sleep frequency)
Sleep function (Power level to keep running)
Sleep function (Sleep time)
Function code J15 (Sleep frequency) is used to set the sleep frequency level. If the inverter output frequency
(motor frequency) is lower than the value set in this function code for a time longer than UD88 (Sleep time), then
the inverter will stop due to sleep conditions. The units of this parameter are Hz.
Function code U134 (Power level to keep running) is used to set the power level to keep running. If the inverter
output power (motor power) is lower than the value set in this function code for a time longer than UD88 (Sleep
time), then the inverter will stop due to sleep conditions. The units of this parameter are percentage (%), where
100% means the value set in function code P02 (motor rated power).
Summary of Contents for Frenic-Sce
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