Communications D - 18Modbus Self-DiagnosisThe Drive has a built-in function for self-diagnosing the operations of the serial communication interface circuits. Theself-diagnosis function tests the serial communications hardware of the Drive by jumpers the send and receive terminals toreceive the same message as the Drive sends.Perform the self-diagnosis function using the following procedure.1. Turn ON the power supply to the Drive, and set parameter H1-05 (Terminal S7 function selection) to 67 (communicationtest mode).2. Turn OFF the power supply to the Drive.3. Jumper the following terminals while the power supply is turned OFF (see diagram below):Connect S+ to R+.Connect S- to R-.Connect S7 to SN.4. Turn ON the terminating resistor. (Turn ON pin 1 on DIP switch 1).5. Turn ON the power supply to the Drive again.Fig D.10 Communication Terminal Connection for Self -Diagnosis Function6. During normal self-diagnostic operation, the Digital Operator displays the frequency reference value. If an error occurs, aCE (Modbus communication error) alarm will be displayed on the Digital Operator, the fault contact output will be turnedON, and the Drive operation ready signal will be turned OFF.SN SC SP A1 A2 +V AC -V A3 MP AC RP R+ R- MCM5 M6 MA MBS1 S2 S3 S4 S5 S6 S7 S8 FM AC AM IG S+ S- M2M3 M4 M1 E(G)E(G)
