2
The Micro-controller can change the parameter, in order to fit different needs. Using the password can
enter into the menu, password is “up down up down up up down”, according to this gradation, in normal
temperature state ,press “
” “
” during 3 seconds, if the password is right, the screen displays “Fxx”,
“xx” is two numbers, means parameter’s code.
Press “
”or“
”for choosing parameter’s code, press “
”“
” at the same time for confirming, then
press “
”or“
”in order to changing the parameter, when the parameters have been adjusted ,press “
”
“
”to confirm.(after adjusted the parameter ,press“
” “
” to return to “Fxx” synchronously, the
adjusted parameter is saved.)
Another way is that press “
”“
” simultaneously at least 5 seconds, then also enter into parameter
setting.
Parameter code is showing below:
Sort
Code
Parameter Name
Range
Factory
Setting
Unit
Remark
Rating
parameter
F10
NA704L
Underload Current:: NA708L
NA712L
1.0 – 40.0
2 – 80
2 – 120
1.0
2
2
A
F11
NA704L
Rated Current:: NA708L
NA712L
1.0 – 40.0
2 – 80
2 – 120
20.0
40
120
A
F12
Overload acts time
0.5 – 30.0
3.0
sec
F13
Deficient-phase acts time
0.5 – 30.0
2.0
sec
F14
Underload acts time
OFF
1 -- 30
OFF
min
OFFmeans no underload
function
Reset
automatically
F21
Reset automatically degree
0 -- 10
1
degree
0 means no “Auto Reset”
F22
Reset automatically time
1 -- 60
5
min
F00
Exit the parameter setting
-
Basic Operating Principle
Current Testing
Through mutual inductor tests load current, the motor’s three phase wire must be through mutual
inductor’s three holes.
Underload protection
when three phase average current lower then setting current (parameter F10), also reach the
“Underload acts time” (parameter F14), circuit protects and load opens.
Overload protection
When three phase average current exceeds rated current (parameter F11), also reach the “Overload
acts time” (parameter F12), circuit protects and load opens. In order to prevent the motor startup current,
“Overload acts time” must be longer than motor startup time.
Deficient-phase protection
Testing the load current, When the maximum current of the three phase is double than the minimum,
controller considers deficient-phase, circuit protects and load opens. But if the load current is less than
0.5A(NA704L)or 1A
（
NA708L/712L
）
, controller don’t test phase, in order to prevent the error action in
the no load state.
“Deficient-phase acts time” can be adjustable through parameter F12.
Reset automatically
After circuit protects and load opens, controller can set reset automatically degree (parameter F21)
and time (parameter F22).
Wiring Diagram:
NA704L NA708L NA712L
Notice
：
1. The earth terminal of the controller should be connected with the earth terminal of the electric
cabinet reliably
，
be sure to connect the earth well.
2. Please use mutual inductor which are supplied by our company.
