Delta CFP2000 Series, User Manual

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Chapter 7 Optional Accessories

CFP2000
7-31

All cables should be as short as possible.

For extra cables, remove them or ground them on each end to avoid floating connection.

Separate the motor cable from the data cables that connect to the motor (for example, encoder line
or motor temperature sensors).

Place the cable on the metal plate, do not hang it in the air.

Use an independent isolated transformer to segregate susceptible equipment from equipment with
stronger interference.

The RC filter is required for the magnetic contactor coil, relay and solenoid valve to eliminate
high-frequency radiation interference (for example, RC elements or varistors with AC coils and
free-wheeling diodes or varistors for DC coils) that comes from turning the unit ON and OFF. All
these protection circuit should be close to the coil.

Make sure the cover, equipment and accessories installed inside the control cabinet (for example,
motor drive or filter) are installed with good-conductivity mounting plate, and are connected to the
cabinet frame with good connection and large contact areas. Most of all, the wiring should be
connected to the PE and EMC isolation bar.

To build up the grounding system, remove the cover with a protective layer or anodic treatment on its
connection, or connect it to the non-conductive layer with a special metal sheet before connecting to
the AC drive.

Keep wires as short as possible and ground metal plates. The cover of the EMC filter and the AC
motor drive or grounding should be fixed to the metal plate and the contact area should be as large
as possible.
Choose suitable motor cable and precautions
Isolate the motor wires, signal wires and data wires.
The recommended shielded wire can be selected from the three types of shielding wire in Figure 1.
The figure on the left is a symmetric three-phase power cord with symmetric PE wires. The middle figure
is a three-phase power cord with a separated PE wire. The figure on the right is the asymmetric
three-phase power cord with a PE wire. )
The size of the power cord should be based on the rated current. Using high density braided shielding
avoids electromagnetic noise that results from high frequency signals, as well as prevents external
sources from interfering with signal transmissions. We recommend two types of shielded cables:

Braided copper shielding of 85% density or more (as shown in figure 2a).

100% aluminum foil / copper foil wrapping inside, and in braided shielding of 80% or more outside
(as shown in figure 2b).
T1
T2 T3
PE
PE PE
T2 T3
PE
T1
T1
T2
T3
PE
Figure 1
Types
shielded cables recommended