T1689 Technical Manual Rev 07 Drive (CDM) Design
MV3000 Air Cooled DELTA initial DELTA Kit list
Page 75
3.2 INITIAL DELTA KIT LIST
The customer’s requirements and initial discussions with the local supplier’s Sales Office should have
established:
• The overall configuration of the drive;
• The ratings;
• An initial list of the DELTA modules and associated components;
• This initial list may need to be modified during the design of the drive,
• Additional components will have to be specified and purchased to complete the CDM.
3.3 ELECTRICAL DESIGN PRINCIPLES
Using the DELTA modular components allows many different configurations. Some typical circuit diagrams are
shown in Appendix B: Electrical Connection Diagrams for both power and control connections.
In addition to following good electrical design practice, the following sections give details on specific
requirements for the DELTA power and control modules.
See Figure 3–1 for the location of detailed design information and recommended work flow.
3.3.1 Electrical Safety
3.3.1.1 CDM Over-Current Protection
The CDM will be connected to hazardous voltages and high energy supplies. In common with all high power
electrical installations, the available short circuit power of the final installation must be considered when
designing the CDM.
The breaking capacity of over-current protective devices (e.g. fuses and breakers), the short-circuit current
rating of cables and components, and the layout and strength of the enclosure must be co-ordinated and be
capable of protecting personnel under normal and fault conditions.
The CDM must be protected against over-current from all energy sources. These sources are usually:
• The main supply (network);
• Machines (e.g. generators or motors regenerating energy);
• Auxiliary power supplies;
• Control power supplies;
• I/O signals.
Over-Current Protection Of DELTA Modules
DELTA modules use solid state (semi-conductor) transistors to regulate the a.c. current. In common with all
products using semiconductor devices, it is possible for two series transistors to fail and create a short-circuit.
This short-circuit will be fed from both the supply and the CDM’s d.c. link capacitors. To limit consequential
damage to other parts of the DELTA module and CDM, external protection is required. This protective device
will be unable to prevent the failure of the short circuit device.
The DELTA modules have been assessed against “breakdown of components” to IEC61800-5-1 and UL508C
when used with high speed fuses (also called semiconductor fuses). These recommended fuses are given in the
specification section for each module.
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