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The protective earth conductor must be sized as specified in Article 250.122 and table
250.122 of the National Electric Code, ANSI/NFPA 70.
For cord-connected equipment, it must not be possible to disconnect the protective earth
conductor before power is removed.
Selecting the control cables
Shielding
￭
Only use shielded control cables.
Use a double-shielded twisted pair cable for analog signals. ABB recommends this type of
cable also for the pulse encoder signals. Use one individually shielded pair for each signal.
Do not use common return for different analog signals.
A double-shielded cable (a) is the best alternative for low-voltage digital signals, but
single-shielded (b) twisted pair cable is also acceptable.
Signals in separate cables
￭
Run analog and digital signals in separate, shielded cables. Do not mix 24 V DC and
115/230 V AC signals in the same cable.
Signals that can be run in the same cable
￭
If their voltage does not exceed 48 V, relay-controlled signals can be run in the same cables
as digital input signals. The relay-controlled signals should be run as twisted pairs.
Relay cable
￭
The cable type with braided metallic shield (for example ÖLFLEX by LAPPKABEL, Germany)
has been tested and approved by ABB.
Control panel to drive cable
￭
Use EIA-485, Cat 5e (or better) cable with male RJ-45 connectors. The maximum length of
the cable is 100 m (328 ft).
PC tool cable
￭
Connect the Drive Composer PC tool to the drive through the USB port of the control panel.
Use a USB Type A (PC) - Type Mini-B (control panel) cable. The maximum length of the
cable is 3 m (9.8 ft).
a
Guidelines for planning the electrical installation 83
b
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