Chapter 4 Operation and Display 
 
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Five-digit LED display, able to display setup frequency, output frequency, various monitoring 
data and alarm code. 
4) Keyboard button description 
      Table 4-1 MD300 inverter keypad button description 
Button Name  Function  
PRG 
programming 
key 
Enter into/ exit from level 1 menu 
ENTER 
confirmation 
key 
enter the menu interfaces level by level, and confirm the 
set parameters.   
ġ  Increase key  increase of the data or function code 
Ģ  decrease key  decrease of the data or function code 
NJ 
shift key 
Select the displayed parameters in turn on the stop display 
interface and running display interface, and select the 
modification digit of parameters when modifying 
parameters.  
RUN Running key 
It is used to start the inverter under keyboard control 
mode.  
STOP/RESET Stop/reset 
Press this button to stop in the running status and reset the 
operation in the fault alarm status. This button 
characteristics are limited by the function code F7-02.   
MF.K 
Multi-function 
selection key 
In case F6-11=0, it can not be used; 
In case F6-11=1, it serves as the key switching between 
local operation and remote operation.   
In case F6-11=2, it serves as forward/reverse rotation 
switching key; 
In case F6-11=3, it serves as forward rotation Jog key; 
Refer to F6-11 for the detailed operation.   
4.2 Description of Function 
Code Viewing and Modification 
Methods
The operation panel of the MD300 
inverter adopts three-level menu structure to 
carry out operations such as parameter 
setting.  
The three-level menu includes function 
parameter set (level 1 menu)ĺFunction code 
(level 2 menu)ĺFunction code setup value 
(level 3 menu).    Fig.4-2 Operation Procedure 
of Three-level Menu,Refer to Fig.4-2 for the 
operation procedure.   
Parameter Set Modification
Function Code Modification
First-level Menu
Second-level Menu Third-level Menu
Function Code Modification
 
Fig.4-2 Operation Procedure of Three-level 
Menu 
 
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