Omron SYSDRIVE 3G3MV

7-33
7-8 Self-diagnostic Test
The Inverter incorporates a self-diagnostic test function that checks
whether RS-422/485 communications are functioning.
IftheInverterhasacommunications failure,takethestepsprovidedbelow
to check whether the communications function of the Inverter is normal.
H Self-diagnostic Test Steps
1. Set the Parameter
S Set n056 for multi-function input 7 (S7) to 35 through the Digital Operator.
2. Turn OFF the Inverter and Wire the Terminal
S Turn OFF the Inverter and wire the following control terminals. At this time, make
sure that all other circuit terminals are open.
Set SW1 to NPN.
Connect S7 and SC.
Connect R+ and S+.
Connect R-- and S--.
3. Turn ON the Inverter and Check the Display
S Turn ON the Inverter.
S Check the display on the Digital Operator.
Normal
The display is normal with no error code displayed.
Fault
The display shows “CE” (communications time-over) or “CAL” (communications
standby). In either case, the communications circuit of the Inverter is broken.
Replace the Inverter.
Communications Chapter 7