Drive (CDM) Design T1689 Technical Manual Rev 07
Electrical design principles MV3000 Air Cooled DELTA
Page 76
3.3.1.2 Segregation Of Persons From Hazardous Voltages
The CDM must be designed in such a manner that persons are not exposed to hazardous voltages during
normal or fault conditions.
The control connections in the DELTA modules and the controller are designed with “protective separation”
from hazardous voltages. The construction of the CDM must be done in such a manner that this protective
separation is not invalidated.
Therefore:
• Separate extra low voltage wiring and components from:
• high voltage components and cabling;
• high power components and cabling (separation still required during arc-faults);
• Design the CDM so that items that need to be monitored or adjusted while the equipment is live
can be accessed without risk.
• To ensure safe access during commissioning, maintenance and fault finding:
• The points of electrical isolation/disconnection of all sources of supply must be clearly
identified;
• Ensure segregation of wiring on the live side of such points from all other items in the
CDM;
• Cover (to the required IP rating) and label all circuits that are permanently live;
• Where it is necessary to measure hazardous voltages during commissioning or fault
finding, ensure that this can be done without risk;
• When the CDM is isolated (electrically safe work condition) from the electrical supplies,
ensure there is access to points that require measurement to prove the absence of
voltage. In addition to supply connections, this must include the d.c. link connections to
the transistor modules as these contain a stored electrical charge.
3.3.1.3 Protection Against Arcing Faults (arc-flash)
Catastrophic failure of equipment fed from high power supplies may cause arcs. This arcing can result in the
ejection of air and particles at high pressure and high temperature. Therefore, arc containment should be
taken into account in the design of the enclosure. Refer to the relevant national or international standards for
further data.
3.3.1.4 Electrical Interference / Electromagnetic Compatibility (EMC)
The CDM has high power, high speed switching devices and sensitive electronic controllers in close proximity.
Care must be taken to avoid these interfering with each other, adjacent equipment or installations.
The adjacent equipment or installations must also be prevented from interfering with the CDM or DELTA
modules.
Immunity Level Of The DELTA Modules & The CDM
The individual DELTA modules and MV3000 control components comply with the immunity requirements for
an industrial environment (‘also known as ‘second environment’) according to IEC 61800-3 or IEC 61000-6-2.
When all of the equipment used in the CDM also meets this immunity requirement (see also Section 2.17.2:
Electromagnetic Compatibility (EMC)) and after a relevant assessment of the complete CDM, this should also
comply with the requirements for the industrial environment.
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