Attachment  Non-standard Specification 
 
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Attachment  Non-standard Specification
Attachment A: MD300 Frequency Switching – Line Speed 
Displaying Non-standard Function Specification 
The non-standard products have two modifications based on general-purpose MD300:   
1. Modification to the frequency source setup: When set frequency source to analog value, the 
frequency source can be switched between analog value and digital setting F0-04 through 
external terminal.   
  If it is necessary to switch between analog value and digital setting, due attention shall be 
paid to the following two points: 1) It is required to set frequency source F0-03=3 or 4, that is, 
select frequency source as analog value. 2) It is required to select one terminal function of 
DI1-DI4 in Group F0 function code as frequency switching terminal. The terminal function 
switched by frequency source is 16(For general-purpose product, 16 refers to “reference switch 
between AI1 and AI2”), such as select DI2 as switching terminal of frequency source, then 
F0-10=16. 
  When disconnecting DI terminal input, the frequency source is set to analog value; when 
closing DI terminal, frequency source is the set frequency of F0-04.   
2. Add display function of line speed 
F6-20 is defined as the display factor of line speed with a range of 0.01 to 100.00, and 
1.00 is the factory default value. The user shall set the parameter in accordance with the needs. 
F6-21 reserved.
 
Display set line speed under stop status of inverter and actual line speed under running 
status.   
 
 
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