Communications Diagnostics Technical data
30
Commander S100 User Guide
Providing suitable cable clearances
A. Do not place sensitive signal cables, such as I/O or 485 connections, within 300 mm (12 in) of the drive, motor cables, external EMC filter, or the
supply cable between the external EMC filter and drive (if applicable) as shown in Figure 4-9.
B. Do not place supply and ground cables within 100 mm (4 in) of the drive or motor cables.
Figure 4-9 Suitable cable clearances
Enclosure layout considerations
•
Use a four-core shielded motor cable to connect the motor to the drive. The ground conductor in the motor cable must be connected directly to
the earth terminal of the drive and motor.
•
If ground connections are made using a separate cable, they should be run parallel to the appropriate power cable to minimise emissions.
•
Use a single power ground bus bar or low impedance earth terminal as a common 'clean' ground for all components within the enclosure. Use to
connect the incoming supply ground, controller ground, drive supply ground, and the enclosure backplate.
•
Any signal cables which are carried inside the motor cable (i.e. motor thermistor, motor brake) will pick up large pulse currents via the cable
capacitance. The shield of these signal cables must be connected to ground close to the motor cable, to avoid this noise current spreading
through the control system.
•
Control wiring that leaves the enclosure must be carried in shielded cable (one or more cables) with the shield clamped to the enclosure back-
plate, or alternatively to the optional drive cable management bracket.
•
A ferrite clamp-on core should be placed over 24 V power supply connections at the input of an external controller or IPC (Industrial PC). These
are also recommended over the I/O and control lines to the drives. These always need to fully embrace pairs of signal/power wires with the
corresponding return wires.
•
Ideally the cabinet will not be painted on the inside, allowing for a large low-impedance return path for reference potential currents.
Managing interruptions to the motor cable
The motor cable should ideally be a single run of shielded cable having no interruptions. In some installations it may be necessary to interrupt the
cable, for example to connect the motor cable to a terminal block within the drive enclosure, or to fit an isolator switch to allow safe working on the
motor. In these cases adhere to the following guidelines:
Terminal block in the enclosure
The motor cable shields should be bonded to the back-plate using uninsulated metal cable-clamps which should be positioned as close as possible to
the terminal block. Keep the length of power conductors to a minimum and ensure that all sensitive equipment and circuits are at least 0.3 m (12 in)
away from the terminal block.
A
A
A
A
A
B
Supply
Sensitive
signal cables
Summary of Contents for COMMANDER S100
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