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6
PLC/SCADA
(master)
A
B
GND
0V
PLC/SCADA
(master)
RECEIVE
TRANSMIT
RXA
RXB
GND
GND
TXA
0V
TXB
0V
1
B
Figure 5 2-Wire Wiring Diagram for the HVAC10 Size 1 Drive
TRANSMIT
1
TXB TXA
Figure 6 4-Wire Wiring Diagram for the HVAC10 Size 1 Drive
DRIVE
(slave)
OFF
ON
1
1
2
2
2
3
4
5
6
A
0V SCR
B
A
DRIVE
(slave)
OFF
ON
1
1
2
2
RECEIVE
2
3
4
5
6
0V SCR RXB RXA
DRIVE
(slave)
last inverter in chain
OFF
1
1
2
2
2
3
1
B
A
0V SCR
DRIVE
(slave)
last inverter in chain
OFF
1
1
2
2
TRANSMIT
2
3
1
TXB TXA
0V SCR RXB RXA
Siemens Apogee P1 Communications Interface
ON
4
5
6
B
A
ON
RECEIVE
4
5
6
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