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Diagnostics Optimization CT MODBUS RTU Technical Data
88 Installation and System Design Guide
Issue Number: 1
Table 4-10 Maximum motor cable lengths (690 V drives)
4.5 Communications connections
The drive offers a 2 wire 485 interface. This enables the drive set-up,
operation and monitoring to be carried out with a PC or controller if
required.
Figure 4-12 Location of the comms connectors
The 485 option provides two parallel RJ45 connectors are provided
allowing easy daisy chaining. The drive only supports MODBUS RTU
protocol. See Table 4-11 for the connection details.
Standard Ethernet cables are not recommended for use when
connecting drives on a 485 network as they do not have the correct
twisted pairs for the pinout of the serial comms port.
Table 4-11 Serial communication port pin-outs
Minimum number of connections are 2, 3, 7 and shield.
The TX Enable is a 0 to +5 V output signal from the drive, which can be
used to control the buffers on an external serial communications device /
converter.
4.5.1 Isolation of the 485 serial communications
port
The serial PC communications port is double insulated and meets the
requirements for SELV in EN 50178:1998.
An isolated serial communications lead has been designed to connect
the drive to IT equipment (such as laptop computers), and is available
from the supplier of the drive. See below for details:
Table 4-12 Isolated serial comms lead details
The “isolated serial communications” lead has reinforced insulation as
defined in IEC60950 for altitudes up to 3,000 m.
690 V Nominal AC supply voltage
Model
Maximum permissible motor cable length for each of the following switching frequencies
3 kHz 4 kHz 6 kHz 8 kHz 12 kHz 16 kHz
07600190
250 m (820 ft) 187 m (614 ft) 125 m (410 ft) 93 m (305 ft) 62 m (203 ft) 46 m (151 ft)
07600240
07600290
07600380
07600440
07600540
08600630
250 m (820 ft) 187 m (614 ft) 125 m (410 ft) 93 m (305 ft) 62 m (203 ft) 46 m (151 ft)
08600860
09601040
250 m (820 ft) 187 m (614 ft) 125 m (410 ft) 93 m (305 ft) 62 m (203 ft) 46 m (151 ft)
09601310
10601500
250 m (820 ft) 187 m (614 ft) 125 m (410 ft) 93 m (305 ft) 62 m (203 ft) 46 m (151 ft)
10601780
11602100
250 m (820 ft) 187 m (614 ft)
11602380
11602630
Pin Function
1 120 Termination resistor
2 RX TX (Receive / transmit line - positive)
3 Isolated 0V
4 +24 V (100 mA)
5 Isolated 0V
6 TX enable
7 RX\ TX\ (Receive / transmit line - negative)
8 RX\ TX\ (if termination resistors are required, link to pin 1)
Shell Isolated 0V
In order to meet the requirements for SELV in IEC60950 (IT
equipment) it is necessary for the control computer to be
grounded. Alternatively, when a lap-top or similar device is
used which has no provision for grounding, an isolation
device must be incorporated in the communications lead.
Part number Description
4500-0096 CT USB Comms cable
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