Network Connection; Drive Dip Switch Settings For Network Connection; Drive Parameter Settings For Modbus Rtu Communication - Trane Mobrus RTU TR1 Series Instruction Manual

Network
Connect the Modbus RTU control wiring to
Connection drive terminals (+)68 and (-)69 on control card
as illustrated.
Use 18 - 24 AWG (1.5 mm) shielded, twisted
pair control wiring. Tighten to 4.5 in-lbs (0.5
Nm).
Shielded wiring must be used. Ground shield
to drive terminal 61, drive casing, or as
appropriate for the network application.
Drive DIP
DIP switches 2 and 3, located on the main
Switch
control board of the drive directly above the
EIA-485 connector, can be used to terminate
Settings for
drives on the Modbus network (see figure). In
Network
addition to serial communication, switch 4 is
Connection
used to isolate a low voltage, external DC
power supply. The factory default switch
positions are ON (see table).
Drive
The Modbus RTU interface to the TR1 Series
Parameter
VFD requires drive parameter values selected
as shown. See the TR1 Series VFD Installation
Settings for
and Operation Manual for details on selecting
Modbus RTU
and changing parameter values, if necessary.
Communica-
tion
• Parameter 500, Protocol: Modbus RTU
• Parameter 501, Address: 001 - 247
• Parameter 502, Baud Rate: 300 - 9600
baud. (Factory default is 9600 baud.)
6
SWITCH
Switch 1
Switches 2 & 3
Switch 4
Drive DIP Switche Settings
69
68
61
Pin 1
EIA-485 Connector
Drive DIP Switches
SETTING
No function
Used for terminating an EIA-485 interface. When
the drive is the first, last, or only device on a
network, switches 2 and 3 must be ON.
When the drive is in any other location on the
network, switches 2 and 3 must be OFF.
Separates the common potential of the internal 24
VDC supply from the common potential of external
24 VDC supply. When switch 4 is in the OFF
position, the external 24 VDC supply is isolated
from the drive. See the drive operation manual for
more information on switch 4.
• Parameter 570, Modbus Parity/Frame:
select from the following, based on
application.
Even Parity/1 Stop
Odd Parity/1 Stop
No Parilty/1 Stop (factory default)
• Parameter 571, Modbus Communication
Timeout: 10 - 2000 ms. (Factory default
setting is 100 ms.)
RTxD' (-)
RTxD (+)
COM