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Chapter 4 - Connections
CD1-a
2.3 - CONNECTION VUE OF CD1-a-400/30 AND 45
U V
W
Br +
Br -
2.4 - MOTOR AND RESOLVER CABLES
Motors and resolvers are grounded via their housing.
Cable inputs must be made by means of metal connectors with collars allowing the 360° shield connection.
The resolver cable must be pair twisted and shielded (sin, cos, ref.). Motor cables MUST also be shielded and
connected over 360° at both ends as shown on shield connection diagram.
The cables of brake equipped motors must also have their brake cables shielded in order to be EMC compliant.
Maximum cable length: - resolver: ≤ 100 m
- motor: 25 m ≤ d ≤ 100 m.
We advise:
- to use the maximum cable section allowed by the connectors,
- to mount a reactance with the motor inductive value between 1% and 3%. The
reactance inductive value must be taken into account in the calculation of the
current loops. The current rating of the reactance must be equal to or higher than
the drive rating.
The reactance must be mounted at the drive output.
Due to the use of a reactance, a shielded cable is not mandatory anymore.
A more complex sinus filter type FN510 by Schaffner may also be mounted instead of
the reactance.
UNDESIRABLE EFFECTS OF MOTOR CABLES LONGER THAN 25 m:
- Heating of the power module, the motor and the cable.
- High overvoltages on the motor windings involving a shortening of their life time.
The reactance reduces the undesirable effects on motor and drive but it may be quite
heated. This requires an appropriate cooling.
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