NOTES ON USING THE BIG18 WITH A SINGLE PHASE TO THREE PHASE INVERTER
1. With all power removed convert the D703 to a single phase control board by moving the wire one
terminal at SW1.
2. The motor wires connected at terminals 4, 5 and 6 on the D703 need to be connected to terminals
U, V and W on the inverter.
3. You will need two 240 volt relays. Connect terminal 4 (COM) on the D703 to one side of the coil of
both relays.
4. Connect 5 (OPEN) from the D703 to the other side of the coil of one relay.
5. Connect 6 (CLOSE) to the other side of the coil on the second relay.
6. Take the COM from the relay side of both relays to DCM (COM) on the inverter.
7. Take the N/O from the OPEN relay to FOR on the inverter.
8. Take the N/O from the COSE relay to REV on the inverter.
9. Connect 240 volts to the inverter at R, S and E and also to the D703 at terminals 1 and 2.
You are now ready to start testing your installation for motor for drive both ways and correct direction as
well as limits.
