
MOVIDRIVE®compact MCH4_A Operating Instructions
15
4
Installation instructions for basic unit
Connecting brak-
ing resistors
•Usetwo closely twisted cables or a 2-core shielded power cable. Cross section
according to the rated output current of the inverter.
• Protect the braking resistor with a bimetallic relay / thermal overload relay (→Wir-
ing diagram for basic unit, power section and brake). Set the trip current according
to the technical data of the braking resistor.
Operating brak-
ing resistors
• The connection leads to the braking resistors carry a high DC voltage (approx. 900
V) during rated operation.
• The surfaces of the braking resistors get very hot when the braking resistors are
loaded with PN. Select a suitable installation position. As a rule, braking resistors
are mounted on the switch cabinet roof.
• Install the flat-type braking resistors together with the appropriate touch guard.
Binary inputs /
binary outputs
• The binary inputs are electrically isolated by optocouplers.
• The binary outputs are short-circuit proof, although they are not interference-
voltage-proof (exception: relay output DOØ1). External voltage can cause irrepara-
ble damage to the binary outputs.
Shielding and
earthing
•Useshielded control cables only.
• Connect the shield by the shortest possible route and make sure it is earthed
over a wide area at both ends. You can ground one end of the shield via a suppres-
sion capacitor (220 nF / 50 V) to avoid ground loops. If using double-shielded cables,
ground the outer shield on the inverter end and the inner shield on the other end.
•Shielding can also be achieved by laying the cables in grounded sheet metal
ducts or metal pipes. In this case, the power cables and control cables should
be laid separately.
•Providehigh frequency compatible grounding for the inverter and all additional
units (wide area metal-on-metal contact between the unit housing and ground, e.g.
unpainted switch cabinet mounting panel).
00755BXX
Figure 11: Example of correct shield connection with metal clamp (shield clamp) or metal
cable gland