Festo Контроллер двигателя CMMD-AS - Manual (Page 115)

6. Electrical installation
Festo P.BE-CMMD-AS-HW-EN 1002NH 115
4. The mains grid PE connection is connected to the PE connection point of the power
connection [X9].
5. The internal PE conductor of the motor cable is connected to the PE connection point
of the motor connection [X6].
6. Signal lines must be separated as far as possible from the power cables. They should
not be routed parallel to one another. If crossovers cannot be avoided, they should be
made as close to vertical (i.e. at a 90° angle) as possible.
7. Unscreened signal and control lines should not be used. If they must be used,
they should at least be twisted.
8. Even screened lines always have short unscreened parts at either end
(unless a screened plug housing is used).
In general: - Connect the inner screens to the pins of the plug
connector provided for the purpose; length max. 40 mm.
- Max. length of unscreened wires: 35 mm.
- Connect total shield flat at the motor to the plug or
motor housing; length max. 40 mm.
6.5.6 Operation with long motor cables
For applications with long motor cables and/or if the wrong motor cables are selected
with excessive cable capacity, the filters may be subjected to thermal overload. In order to
avoid such problems, we strongly recommend the following procedure for applications in
which long motor cables are required:
- From a cable length of over 15m, only cables with a capacitance between the
motor phase and screen of less than 200 pF/m, or, if possible less than 150
pF/m! (Please contact your motor cable vendor if necessary)
- Use of a dU/dt filter on the motor output
- Filter on the voltage supply connection
- Mains filter.
6.5.7 ESD protection
Caution
If non-assigned plug connectors are used, there is a danger that
damage may occur to the device or to other parts of the system
as a result of ESD (electrostatic discharge).
Protective caps are available from specialised retailers to prevent
electrostatic discharges.