ACS 300 User’s Manual
17
Chapter 3 - Power Connections
Motor Cable
A three conductor screened cable (three phase with consentric
protective earth) is recommended, because unscreened cables
may lead to unwanted problems of electrical noise emission.
Note! To avoid disturbance, install the motor cable away from the
control cable route. Avoid long runs parallel with control cables.
The rapid voltage changes cause capacitive current in the motor
cable. This current increases with the switching frequency and
motor cable length. This phenomenon can cause substantially
higher current measured by the ACS 300 than the actual motor
current, and can cause overcurrent tripping. Do not exceed cable
lengths of 100 m. The capacitive current can be diminished with
an output choke coil. If the cable length exceeds 100 m, please
contact your local distributor or ABB office.
Brake Cable
Use also screened cable for brake unit connections. The cross
section of an individual wire should be at least equal to that
recommended for mains cable in Table 3-1.
EMC
To suppress the RFI emission below the limits mandated by the
EMC Directive, it is important to pay attention to the following:
The mains, motor and brake cables must be clamped at the entry
point, see Figure 3-4 and Figure 3-5. There is a clamping plate
for that purpose. Make it certain that the screens of the cables
make solid contacts to both parts of the clamp. Leave the
individual unscreened wire loops between the clamp and the
screw terminals as short as possible. Route the mains wires
away from the others. Motor cable must be a symmetrical three
phase cable with foil or braid shield, see Figure 3-3.
Summary of Contents for ACS 300
Page 14: ...xiv ACS 300 User s Manual Table of Contents ...
Page 24: ...10 ACS 300 User s Manual Chapter 1 Overview of This Manual ...
Page 28: ...14 ACS 300 User s Manual Chapter 2 Mechanical Installation ...
Page 50: ...36 ACS 300 User s Manual Chapter 4 Control Connections ...
Page 60: ...46 ACS 300 User s Manual Chapter 6 Control and Parameter Logic ...