DIs  are  used  to  control  forward 
running  and  reverse  running 
instructed  by  the  inverter.  The 
inverter  instructs  forward  running 
when  only  the  DI  with  the  forward 
running function is on. The inverter 
instructs reverse running when only 
the  DI  with  the  reverse  running 
function  is  on.  The  inverter  stops 
when  both  the  DI  with  the  forward 
running function and the DI with the 
reverse running function are on. 
When the DI with this function is on, 
the inverter can be reset after a fault 
occurs. 
External fault signals can be input by 
means of the DIs, so that the inverter 
can  implement  fault  monitoring  on 
external  devices.  After  the  DI 
receives  a  fault  signal,  the  inverter 
stops and reports Err15.