Chapter 3 Installation and Wiring GK600 User Manual
- 52 -
Signal lines should be provided with shielded layer and reliably grounded. Alternatively, signal
cable could be put into metallic conduits between which the distance shall be no less than
20cm, and shall be kept as far away from the drive, its peripheral devices, and cables as
possible. Never make signal lines in parallel with power lines or bundle them up.
Signal lines must orthogonally cross power lines if this cross is inevitable. Motor cables shall be
placed in thick protective screen like more than 2mm-thick pipelines or buried in cement groove,
also, power lines can be put into metallic conduit and grounded well with shielded cables.
Use 4-core motor cables of which one is grounded at close side of the drive and the other side
is connected to motor enclosure.
Input and output terminals of the drive are respectively equipped with radio noise filter and
linear noise filter. For example, ferrite common mode choke can restrain radiation noise of
power lines.
3.11.2 Grounding
Recommended ground electrode is shown in the figure below:
Fig. 3-23 Grounding
Use to the fullest extent the maximum standard size of grounding cables to reduce the impedance
of grounding system.
Grounding wires should be as short as possible. Grounding point shall be as close to the drive as
possible.
One wire of 4-core motor cables shall be grounded at the drive side and connected to grounding
terminal of motor at the other side. Better effect will be achieved if motor and drive are provided
with dedicated ground electrodes.
When grounding terminals of various parts of system are linked together, leakage current turns
into a noise source that may influence other equipment in the system, thus, grounding terminals of
the drive and other vulnerable equipment should be separated. Grounding cable shall be kept
away from inlet & output of noise-sensitive equipment.
3.11.3 Leakage Current Suppression
Leakage current passes through the line-to-line and ground distributed capacitors at input &
output sides of drive, and its size is associated with the capacitance of distributed capacitor and
变频器
电机
PE
Drive
Motor
