4 
 
9.2.1 Environment ................................................................................................................................ 171 
9.2.2 Voltage ......................................................................................................................................... 171 
9.2.3 Keypad Monitor ......................................................................................................................... 171 
9.2.4 Enclosure ..................................................................................................................................... 171 
9.2.5 Main Circuit ................................................................................................................................. 172 
9.2.6 Main Circuit- Terminals & Cables ........................................................................................... 172 
9.2.7 Main Circuit- Capacitors ........................................................................................................... 172 
9.2.8 Main Circuit- Resistors .............................................................................................................. 173 
9.2.9 Main Circuit- Magnetic Contactors & Relays ...................................................................... 173 
9.2.10 Control Circuit- Control Boards & Connectors ................................................................. 173 
9.2.11 Cooling- Fans ........................................................................................................................... 174 
9.2.12 Cooling- Air Duct ..................................................................................................................... 174 
9.3 Drive Cooling Fans ................................................................................................................................ 174 
9.3.1 Cooling Fan Replacement ........................................................................................................ 174 
9.3.2 Removing Cooling Fan ............................................................................................................. 175 
Chapter 10│Drive Derating............................................................................................................................... 176 
10.1 Temperature Derating ....................................................................................................................... 176 
10.2 Altitude Derating ................................................................................................................................ 176 
Chapter 11│Communications .......................................................................................................................... 177 
11.1 Modbus Communication Specifications ....................................................................................... 177 
11.2 Connecting to Controller/PLC/HMI ................................................................................................ 177 
11.2.1 Communication Cable Connection ..................................................................................... 177 
11.3 Modbus Setup Parameters ............................................................................................................... 178 
11.4 Drive Operations by Modbus .......................................................................................................... 179 
11.4.1 Actions by Modbus ................................................................................................................. 179 
11.4.2 Drive Control by Modbus ...................................................................................................... 179 
11.5 Message Format ................................................................................................................................. 180 
11.5.1 Message Content .................................................................................................................... 180 
11.5.2 Message Configuration.......................................................................................................... 180 
11.5.3 Slave Station Address ............................................................................................................. 180 
11.5.4 Function Code .......................................................................................................................... 180 
11.5.5 Data ............................................................................................................................................ 180 
11.5.6 Error Check ................................................................................................................................ 181 
11.5.7 Command Data ........................................................................................................................ 181 
11.5.8 Response Message ................................................................................................................. 182 
11.6 Example of Reading / Responding Data........................................................................................ 182 
11.7 Modbus Data ....................................................................................................................................... 184 
11.8 Communication Errors ...................................................................................................................... 188 
11.8.1 Modbus Errors .......................................................................................................................... 188 
11.8.2  Slave Response ..................................................................................................................... 189