T1689 Technical Manual Rev 07 Drive (CDM) Design
MV3000 Air Cooled DELTA Electrical design principles
Page 77
Emission Levels From The CDM
DELTA modules are open frame units that contain electrically noisy waveforms. The actual emission levels
from the CDM will be heavily dependent on the selection and layout of all the components in the CDM. Some
general guidance is given here:
If no special measures are taken, the drive may have to be classified as Category C4 according to
IEC 61800-3.
Compliance with IEC 61800-3 will require radio-frequency filtering on the main supply of AEM drives and may
be required on the DFE drives. If an auxiliary supply is used, it is likely to require some filtering because this
emission category has a lower emission limit for ports with rated current below 100 A. Some care with
shielding and segregation will also be required. An “EMC style” enclosure may be required.
The “industrial” limit of IEC 61000-6-4 / EN 61000-6-4 is identical to IEC 61800-3 Category C2. This will require
filters with high attenuation on both main power and auxiliary connections. It will also require significant care
with shielding and segregation within the enclosure, which is beyond the scope of this manual.
Due to the very high power rating, it is extremely unlikely that the CDM would be used in an environment that
requires compliance with the residential emission limits of IEC 61000-6-3 / EN 61000-6-3 or IEC 61800-3
Category C1. Compliance with such a limit is very difficult to achieve on equipment with such high power
rating.
3.3.1.5 Designing The CDM To Comply With International Standards
The DELTA modules have been designed and evaluated against the international standards shown in the
specification section. The designer of the CDM is responsible to ensure that the design, assembly and testing of
the CDM complies with the relevant standards.
The following data has been provided where the individual module depends on particular features of the CDM
for compliance against the named standard.
System Design Requirements To Satisfy UL 508C
UL 508C has a number of requirements that must be satisfied when designing the CDM. The following have
been highlighted as they may be missed when designing the CDM to comply with UL508C:
• Motor over-temperature monitoring is required. See the data on the User I/O panel for available
inputs for the CDM;
• Semiconductor fuses should be located within the same enclosure as the DELTA module;
• The integral short circuit protection provided by the DELTA module does not provide branch
circuit protection. Branch circuit protection must be provided in accordance with the National
Electric Code and any additional local codes.
3.3.2 Electrical Design For Reliability
3.3.2.1 Bonding
In additional to electrical safety bonding, functional bonding of the enclosure/s and components is mandatory.
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