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Unidrive SPM User Guide 83
Issue Number: 3 www.controltechniques.com
Figure 6-22 Feedback cable, twisted pair
Figure 6-23 Feedback cable connections
To ensure suppression of radio frequency emission,
observe the following:
• Use a cable with an overall shield
• Clamp the overall shield to grounded metallic surfaces at both the
encoder and the drive, as illustrated in Figure 6-23
6.13.4 Compliance with EN 61800-3 (standard for
Power Drive Systems)
Meeting the requirements of this standard depends on the environment
that the drive is intended to operate in, as follows:
Operation in the first environment
Observe the guidelines given in section 6.13.5 Compliance with generic
emission standards on page 84. An external EMC filter will always be
required.
Operation in the second environment
In all cases a shielded motor cable must be used, and an EMC filter is
required for all Unidrive SPs with a rated input current of less than 100A.
The drive contains an in-built filter for basic emission control. In some
cases feeding the motor cables (U, V and W) once through a ferrite ring
can maintain compliance for longer cable lengths. The requirements of
operating in the second environment are met, depending on the motor
cable length for 3kHz switching frequency as stated in Table 6-23.
The table summarizes the performance of in-built filters when used with
SPMA drives and single pairs of SPMD drives and SPMC/U rectifiers,
assembled in the standard recommended configuration.
Table 6-23 Second environment emission compliance
Key:
Unrestricted: EN 61800-3 second environment, unrestricted
distribution
For longer motor cables, an external filter is required. Where a filter is
required, follow the guidelines in section 6.13.5 Compliance with generic
emission standards .
Where a filter is not required, follow the guidelines given in section
6.13.3 General requirements for EMC on page 81.
Refer to section 14.1.26 Electromagnetic compatibility (EMC) on
page 272 for further information on compliance with EMC standards and
definitions of environments.
Detailed instructions and EMC information are given in the Unidrive SP
EMC Data Sheet which is available from the supplier of the drive.
This is a product of the restricted distribution class according
to IEC 61800-3
In a residential environment this product may cause radio
interference in which case the user may be required to take
adequate measures.
Twisted
pair
cable
Twisted pair shield
Cable
Cable overall shield
Cable
Cable
shield
Twisted
pair
shield
Cable
shield
Twisted
pair
shield
Connection
at motor
Connection
at drive
Ground clamp
on shield
Shield
connection
to 0V
Shield
connection
to 0V
Drive size Filter Voltage Motor cable length 0 - 100 (m)
SPMA In-built Any Unrestricted
SPMD In-built Any Unrestricted
The second environment typically includes an industrial low-
voltage power supply network which does not supply
buildings used for residential purposes. Operating the drive in
this environment without an external EMC filter may cause
interference to nearby electronic equipment whose sensitivity
has not been appreciated. The user must take remedial
measures if this situation arises. If the consequences of
unexpected disturbances are severe, it is recommended that
the guidelines in section 6.13.5 Compliance with generic
emission standards be adhered to.
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