Serial Communication; Electrical Installation - Emc Precautions - GE AF-650 GP Design And Installation Manual

Installation
prevents generating the voltage required to rotate the
motor. To run STO, additional wiring for the frequency
converter is required. Refer to Safe Torque Off Operating
Instructions for further information.

2.5.6 Serial Communication

2 2
Connect RS485 serial communication wiring to terminals
(+)68 and (-)69.
•
Shielded serial communication cable is
recommended.
•
See chapter 2.5.2 Grounding Requirements for
proper grounding.
Illustration 2.19 Serial Communication Wiring Diagram
For basic serial communication set-up, select the following:
1. Protocol type in parameter O-30 Protocol.
2. Frequency converter address in
parameter O-31 Address.
3. Baud rate in parameter O-32 Drive Port Baud Rate.
•
Two communication protocols are internal to the
frequency converter.
-
-
•
Functions can be programmed remotely using
the protocol software and RS485 connection or in
parameter group O-## Options/Comms.
•
Selecting a specific communication protocol
changes various default parameter settings to
match that protocol's specifications along with
making extra protocol-specific parameters
available.
•
Option cards which install into the frequency
converter are available to provide extra communi-
cation protocols. See the option-card
documentation for installation and operation
instructions.
26
Drive profile
Modbus RTU
DET-767c All rights reserved.
2.5.7 Electrical Installation - EMC
Precautions
The following is a guideline to good engineering practice
when installing frequency converters. Follow these
guidelines to comply with EN 61800-3 First environment. If
the installation is in EN 61800-3 Second environment, that
is, industrial networks, or in an installation with its own
transformer, deviation from these guidelines is allowed but
not recommended. See also chapter 7.1.1 General Aspects of
EMC Emissions, and chapter 7.1.3 EMC Test Results (Emission).
Good engineering practice to ensure EMC-correct
electrical installation:
•
Use only braided screened/armoured motor
cables and braided screened/armoured control
cables. The shield should provide a minimum
coverage of 80%. The shield material must be
metal, not limited to but typically copper,
aluminum, steel, or lead. There are no special
requirements for the mains cable.
•
Installations using rigid metal conduits are not
required to use shielded cable, but the motor
cable must be installed in conduit separate from
the control and mains cables. Full connection of
the conduit from the frequency converter to the
motor is required. The EMC performance of
flexible conduits varies a lot and information from
the manufacturer must be obtained.
•
Connect the screen/armour/conduit to ground at
both ends for motor cables and for control
cables. Sometimes, it is not possible to connect
the shield in both ends. If so, connect the shield
at the frequency converter.
•
Avoid terminating the screen/armour with twisted
ends (pigtails). It increases the high frequency
impedance of the shield, which reduces its
effectiveness at high frequencies. Use low
impedance cable clamps or EMC cable glands
instead.
•
Avoid using unscreened/unarmoured motor or
control cables inside cabinets housing the
drive(s), whenever this can be avoided.
Leave the shield as close to the connectors as possible.
Illustration 2.20 shows an example of an EMC-correct
electrical installation of an IP20 frequency converter. The
frequency converter is fitted in an installation cabinet with
an output contactor and connected to a PLC, which is
installed in a separate cabinet. Other ways of doing the
installation may have just as good an EMC performance,
provided the above guide lines to engineering practice are
followed.
MG35M402