EM12-SP User Manual
5. Description of Function Code
25
MPPT
PE-02
CVT
Controller
ref
f
mpp
V
pn
V
PE-01
PE-04~PE-08
PE-10~PE-13
Diagram 5-3 Photovoltaic water pump control schematic
FE-04
CVT proportional gain 1
0.0% - 999.9%
100.0%
FE-05
CVT Integral gain1
0.0% - 999.9%
100.0%
It is CVT controller’s PI parameters
，
it should be switchover in two groups according to solar cells Vpn voltage ,
switchover point is FE-08V; switchover point FE-08 default as 0.0V. It is for enable the first group parameters,
switchover theory as below diagram:
PE-08
PE-08+50V
K2
K1
KP/KI
Vpn
Diagarm 5-4 Switch the schematic
CVT controller is the core parts for solar water pump control, if any unbalance output frequency, please close
MPPT(select manual reference Vmpp ), then adjust proportional gain or Integral gain till frequency is stable; after
that, open MPPT search again;
FE-10 Mppt search upper limit voltage 0 - 1000.0V
750.0V
FE-11 Mppt search lower limit voltage 0 - 1000.0V
300.0V
FE-12 MPPT search gain
0% - 500%
100%
FE-13 MPPT search time interval
0.0 - 10.0sec
1.0sec
FE-10/FE-11set MPPT search Vmpp’s upper or limit value,FE-12 set search gain, FE-13 set search time interval
，
If
open MPPT, frequency fluctuation is very large, decrease search gain and increase search time interval to improve
its stability.
FE-31 Full-water detection mode
0: terminal
1: AI1
2: AI2
0
FE-32
Analog full-water detection
Thresholds
0 - 100.0%
25.0%
