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Diagnostics Optimization CT MODBUS RTU Technical Data
E300 Design Guide 119
Issue Number: 1
5.19 Changing the operating mode
Changing the operating mode returns all parameters to their default value, including the motor parameters. User Security Status (H02) and User
Security Code (H01) are not affected by this procedure.
Procedure
Use the following procedure only if a different operating mode is required:
1. Ensure the drive is not enabled, i.e. the Safe Torque Off (STO), Drive enable on Terminal 31 is On (1) or Off (0)
2. Enter either of the following values in Pr mm00, as appropriate:
1253 (50 Hz AC supply frequency)
1254 (60 Hz AC supply frequency)
3. Change the setting of Drive Control Mode (B01) as follows:
The figures in the second column apply when serial communications are used.
4. Either:
• Press the red reset button
• Toggle the reset digital input
Entering 1253 or 1254 in Pr mm00 will only load defaults if the setting of Drive Control Mode (B01) has been changed.
5.20 Communications
The E300 Advanced Elevator drive offers a 2 wire EIA485 interface. This enables the drive set-up, operation and monitoring to be carried out with a
PC or controller if required.
5.20.1 485 Serial communications
The EIA485 option provides two parallel RJ45 connectors allowing easy daisy chaining. The drive only supports MODBUS RTU protocol.
The serial communications port of the drive is a RJ45 socket, which is isolated from the power stage and the other control terminals (see section
4.4 Communications connections on page 66 for connection and isolation details).
The communications port applies a 2 unit load to the communications network.
USB/EIA232 to EIA485 Communications
An external USB/EIA232 hardware interface such as a PC cannot be used directly with the 2-wire EIA485 interface of the drive. Therefore a suitable
converter is required.
Suitable USB to EIA485 and EIA232 to EIA485 isolated converters are available as follows:
• CT USB Comms cable (CT Part No. 4500-0096)
• CT EIA232 Comms cable (CT Part No. 4500-0087)
When using the CT EIA232 Comms cable the available baud rate is limited to 19.2 k baud.
When using one of the above converters or any other suitable converter with the drive, it is recommended that no terminating resistors be connected
on the network. It may be necessary to remove / deselect the terminating resistor within a non-CT converter, depending on which type is used. The
information on how to link out the terminating resistor will normally be contained in the user information supplied with the converter.
Serial communications set-up parameters
The following parameters need to be set according to the system requirements.
Serial Address (M01)
This parameter defines the serial address and an addresses between 1 and 247 are permitted.
Changing the parameters does not immediately change the serial communications settings. See note below for more details.
Drive control mode (B01) Operating mode
1 Open-loop Open loop mode
2 RFC-A RFC-A mode
3 RFC-S RFC-S mode
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