Rockwell Automation 5730 DriveLogix5730 Controller for PowerFlex 700S Drives with Phase II Control - Manual (Page 179)

Chapter
9
Communicating with Devices on a DH485 Link
De-energizing the Drive to
Connect or Disconnect a
Cable
During the process of configuring DH485 communication you will need to
connect or disconnect a programming or network cable at the controller.
You should do this only if the drive is de-energized.
1. Turn off and lock out input power. Wait five minutes.
2. Verify that there is no voltage at the drive’s input power terminals.
3. Measure the DC bus voltage at the +DC & -DC terminals on the Power
Terminal Block. The voltage must be zero.
4. Connect or disconnect the programming or network cable.
5. Turn power back on and proceed with configuring DH485
communication.
Understanding How the
DriveLogix5730 Controller
Supports DH485
Communications When using a DriveLogix5730 controller it is recommended that you use
NetLinx networks (EtherNet/IP, ControlNet, or DeviceNet) because
excessive traffic on a DH-485 network may make it impractical to connect
to a DriveLogix5730 controller with RSLogix 5000 programming software.
DriveLogix5730 processors fully support the DH-485 protocol, but using
the recommended NetLinx networks is more practical.
The DH-485 protocol uses RS-485 half-duplex as its physical interface.
(RS-485 is a definition of electrical characteristics; it is not a protocol.) You
can configure the RS-232 port of the DriveLogix5730 controller to act as a
DH-485 interface. By using a 1761-NET-AIC and the appropriate RS232
cable (1756-CP3 or 1747-CP3), a DriveLogix5730 controller can send and
receive data on a DH-485 network.
Important: A DH-485 network consists of multiple cable segments. Limit
the total length of all the segments to 1219m (4000 ft.).
!
ATTENTION: Severe injury or death can result from electrical
shock or burn. Verify that the voltage on the bus capacitors has
discharged before connecting to the communication ports.
Measure the DC bus voltage at the +DC & -DC terminals on the
Power Terminal Block. The voltage must be zero.