Instruction Manual for AS380 Series Elevator Integrated Drive Controller
Appendix A EMC Installation Guide
Fig A3.1 Dedicated Ground Pole
Among the above-shown four figures, (a) shows the optimal grounding method. Users are advised
to use this method as practicably as possible.
A3.2 Precautions for Grounding Connection
(1) Use grounding cable of standard cross section as far as possible in order to minimize the
grounding impedance; due to flat cable has smaller high-frequency impedance than round-section
cable, therefore, flat cable with identical cross-sectional area will be more preferable.
(2) The ground cable should be as short as possible and the grounding point should be close to
the elevator integrated drive controller as practicably as possible.
(3) If four-core cable is used for motor line, one of the four core conductors must be grounded in
such a way that one end of it is grounded by the side of elevator integrated drive controller and
another end is connected to the ground terminal of motor. The optimal grounding effect may be
achieved if each of both motor and the elevator integrated drive controller has individual dedicated
ground pole.
(4) Where all ground terminals of system components are combined together, the noise source
caused by ground leakage current will affect the other peripherals of elevator integrated drive
controller. Therefore, in a same control system, the grounding for elevator integrated drive
controller shall be separated from those for weak voltage equipment such as computer, sensor or
audio devices.
(5) To get smaller high-frequency impedance, the anchor bolts of equipment may be used as
high-frequency terminal connecting rear panel of cabinet. Note to remove insulation coating
around the securing point in installation.
(6) The grounding cable must be laid far away from the I/O wirings of noise sensitive equipment.
In addition, the grounding cable must be as short as possible.
A4 Install Surge Absorption Device
Even if they are installed outside or elevator integrated drive controller, such heavy noise
production devices as relay, contactor and electromagnetic brake must be additionally provided
with surge suppressor. As shown in Figure 4.1.
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