M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation
M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation
M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation
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Serial Interface A-B<br />
The following figure shows the connections of the serial interface and the position of the<br />
micro-switch for the bus termination resistor.<br />
Connection Terminals of the Serial Interface and Microswitch S4<br />
(Bus Terminating Resistor)<br />
The two control signal terminals A and B enable the connection of a shielded RS485<br />
twisted-pair cable.<br />
The bus terminating resistor required at the end of a data cable is integrated in the frequency<br />
inverter and can be connected via microswitch S4.<br />
The network cable must have a bus termination resistor (120 ohms) connected at each<br />
physical end to prevent reflections and the resulting transmission faults.<br />
Two-Wire RS485 Connection<br />
(Slave = M-Max <strong>Frequency</strong> Inverter)<br />
120 ohms<br />
S4<br />
RS485<br />
– Term<br />
Slave Master<br />
A<br />
B<br />
PES<br />
RS485<br />
Modbus (RTU)<br />
AI2 GND DO– DI4 DI5 DI6 AO DO+ R13 R14 – R24<br />
4 5 13 14 15 16 18 20 22 23 26<br />
1 2 3 6 7 8 9 10 25 24<br />
+10V AI1 GND 24V DI-C DI1 DI2 DI3 A B R21 R22<br />
The parameter definition of the serial interface is described in “Serial Interface<br />
(Modbus RTU)” on Page 129.<br />
PES<br />
A<br />
B<br />
LOGIC<br />
– +<br />
AI 1<br />
V mA<br />
AI 2<br />
V mA<br />
RS 485<br />
– Term.<br />
S4 = RS485 (–)<br />
Installation<br />
M-Max <strong>Series</strong> <strong>Adjustable</strong> <strong>Frequency</strong> <strong>Drive</strong> MN04020003E—April 2011 www.eaton.com 43
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