Serial Communications Connections; Figure 4-38 Surge Suppression For Digital And Unipolar Inputs And Outputs; Figure 4-39 Surge Suppression For Analog And Bipolar Inputs And Outputs; Figure 4-40 Location Of The Rj45 Serial Comms Connector - Emerson unidrive sp User Manual

Safety Product Mechanical
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2. Shielded cable with additional power ground bonding. The cable
shield may be connected to ground at both ends, but in addition the
ground conductors at both ends of the cable must be bonded
together by a power ground cable (equipotential bonding cable) with
cross-sectional area of at least 10mm
signal cable shield, or to suit the electrical safety requirements of the
plant. This ensures that fault or surge current passes mainly through
the ground cable and not in the signal cable shield. If the building or
plant has a well-designed common bonded network this precaution
is not necessary.
3. Additional over-voltage suppression - for the analog and digital
inputs and outputs, a zener diode network or a commercially
available surge suppressor may be connected in parallel with the
input circuit as shown in Figure 4-38 and Figure 4-39.
If a digital port experiences a severe surge its protective trip may operate
(O.Ld1 trip code 26). For continued operation after such an event, the
trip can be reset automatically by setting Pr 10.34 to 5.
Figure 4-38 Surge suppression for digital and unipolar inputs and
outputs
Signal from plant
0V
Figure 4-39 Surge suppression for analog and bipolar inputs and
outputs
Signal from plant
0V
Surge suppression devices are available as rail-mounting modules, e.g.
from Phoenix Contact:
Unipolar TT-UKK5-D/24 DC
Bipolar TT-UKK5-D/24 AC
These devices are not suitable for encoder signals or fast digital data
networks because the capacitance of the diodes adversely affects the
signal. Most encoders have galvanic isolation of the signal circuit from
the motor frame, in which case no precautions are required. For data
networks, follow the specific recommendations for the particular
network.
90
Electrical Getting Basic
installation Started parameters
2
, or 10 times the area of the
Signal to drive
30V zener diode
e.g. 2xBZW50-15
0V
Signal to drive
2 x 15V zener diode
e.g. 2xBZW50-15
0V
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4.12

Serial communications connections

The drive has a serial communications port (serial port) as standard
supporting 2 wire EIA485 communications. Please see Table 4-16 for
the connection details for the RJ45 connector.

Figure 4-40 Location of the RJ45 serial comms connector

Table 4-16 Connection details for RJ45 connector

Pin
1 120Ω Termination resistor
2 RX TX
3 Isolated 0V
4 +24V (100mA)
5 Isolated 0V
6 TX enable
7 RX\ TX\
8 RX\ TX\ (if termination resistors are required, link to pin 1)
Shell Isolated 0V
The communications port applies a 2 unit load to the communications
network.
Minimum number of connections are 2, 3, 7 and shield. Shielded cable
must be used at all times.
4.12.1 Isolation of the serial communications port
The serial PC communications port is double insulated and meets the
requirements for SELV in EN50178.
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
WARNING device must be incorporated in the communications lead.
An isolated serial communications lead has been designed to connect
the drive to IT equipment (such as lap-top computers), and is available
from the supplier of the drive. See below for details:

Table 4-17 Isolated serial comms lead details

Part number
4500-0087
4500-0096
The "isolated serial communications" lead has reinforced insulation as
defined in IEC60950 for altitudes up to 3,000m.
N
NOTE
When using the CT EIA232 Comms cable the available baud rate is
limited to 19.2k baud.
Onboard Advanced Technical
Diagnostics
PLC parameters Data
1
8
Function
Description
CT EIA232 Comms cable
CT USB Comms cable
Unidrive SP User Guide
Issue Number: 13
UL Listing
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