User manual
4-1
DSC/DSCT Series
4. ANTI-INTERFERENCE
MEASURES
Electrical and electronic equipment can interfere each other through the mains connections or other metal
connections between each other. In order to minimise or eliminate this reciprocal interference it is necessary
the drive being correctly installed in conjunction with anti-interference devices (if required).
The following advice regards a mains power supply which is not disturbed. If interference exists other
measures must be taken to reduce the interference itself.
In these latter cases giving general advice is not possible and if the anti-interference measures do not lead
the desired results we would kindly ask you please to contact TDE MACNO.
•
Ensure that all the equipment in the cabinet is well connected to the ground bar using short cables with
starconnections. In particular , it is important that any control equipment connected to the drive, e.g. PLC,
is grounded by using short wires.
•
The drive must be fixed with screws and washers to ensure a good electrical connection between the
external container and the metallic support, connected to ground, and to the switchboard. If necessary
remove the paint to ensure a good contact.
•
For the motor connection use only shielded or armoured cable and connect the shielding to ground both
at the drive end and at the motor end. If it is not possible to use shielded cable the motor cables should
be placed in a metal channel which is connected to ground.
•
Keep the motor connection, drive and control connection cables separate from each other and at a
distance from each other.
•
For the braking resistance cable connection use shielded cable connecting the shield to ground on both
sides, the drive side and the resistor side.
•
Lay the control cables at a distance of at least 10 cm from any parallel power cables. In this case too it is
advisable to use a separate metal channel which is also connected to ground. If the control cables should
cross over the power cables maintain a cross-over angle of 90
°
.
•
Ensure that any RC groups or flywheel diode for coils for the remote switches, relays and other
electromagnetic switches installed in the same cabinet as the drive are mounted directly onto the coil
connections themselves.
•
Make all connections of control, measuring and regulation external systems with shielded cables.
•
Cables which can radiate interference must be placed separately and distant from the drive control
cables.
If the drive operates in a particularly noise sensitive environment it is also necessary to take the following
measures to reduce the conducted and radiated interference:
•
Use the DSC or DSCT drive with an external EMC filter (Shaffner, …).
•
Take all necessary measures with regard to the cabinet thus to block radiated emissions, like grounding
all metal parts, the use of minimum hole openings in the external walls and the use of conducting gasket
