Huawei SmartLogger2000 User Manual page 149

SmartLogger2000
User Manual
No. Parameter
direction
14 Working
mode
15 Maximum
system
DC-to-ground
withstand
voltage
16 AC-to-ground
resistance
alarm
threshold
Issue 04 (2018-04-10)
Function Value
PV+
negative
offset
Specifies the Normal
working mode of
the PID module.
Commissi
oning
Specifies the 500–1500
voltages between V
the PV side and PE
and between the
AC side and
ground in normal
mode.
Specifies the alarm 0.2–100
kΩ
threshold for the
impedance
between the AC
side of the PID
module and
ground.
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Description
Select PV– positive offset for P-type PV
modules or the N-type PV modules that comprise
the solar cells whose positive and negative
polarities are on different sides. For example,
P-type PV modules, HIT, CIS, thin-film PV
modules, and CdTe PV modules meet the
requirement for PV– positive offset.

PV+ negative offset refers to lowering the
voltage between PV+ and ground to below 0 V
through voltage compensation.
Select PV+ negative offset for the N-type PV
modules that comprise the solar cells whose
positive and negative polarities are on the same
side.
NOTE
When designing a PV plant, the design institute or user
should ask the PV module vendor about the direction of
voltage compensation for resisting the PID effect.
In normal mode, the PID module operates
automatically after the PID module, inverter, and
SmartLogger communicate with each other properly.
In commissioning mode, set Commissioning output
voltage. The PID module delivers voltage based on
the commissioning output voltage.
NOTE
To check whether the PID module functions properly, it is
recommended that Working mode be set to
Commissioning upon first power-on.
Specifies the lower thresholds of the maximum
voltage ranges between the inverter DC side
(including the inverter, PV module, cable, SPD, and
switch) and ground in a PV power system.
The default value is 1000 V. For the 1500 V
inverter, the recommended value is 1500 V.
You can set an alarm threshold for the impedance
between the AC grid and ground for the PID
module. If the detected impedance is below the
threshold, the PID module will generate an alarm.
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