48
DFS1/DFS2 Power Installation Guide
Issue Number: 2
4.22.2
Motor cable
Use four core cable to connect the motor to the drive. Connect the ground core of the motor cable to
the ground terminal of the motor. See Figure 4-8.
A shielded cable may also be used. The shield of the motor cable should be connected to the ground
terminal of the motor frame using a link that is as short as possible and not exceeding 50 mm (2 in)
long. A full 360° termination of the shield to the terminal housing of the motor is beneficial.
Figure 4-8 Grounding the motor cable shield
4.22.3
Control cables
If the control circuit 0 V must be connected to Ground, this should be done at the system controller
to avoid injecting noise into the 0 V circuit.
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.
4.22.4
Feedback device cable shielding
Shielding considerations are important for PWM drive installations due to the high voltages and
currents present in the output (motor) circuit with a very wide frequency spectrum, typically from 0 to
20 MHz.
To ensure correct transfer of data, observe the following:
NOTE
Summary of Contents for DFS 1
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