T1689 Technical Manual Rev 07 Drive (CDM) Design
MV3000 Air Cooled DELTA InItial CDM ARRANGEMENT
Page 87
3.6.4 Position Of DELTA Rectifier Modules
It is recommended that the DELTA rectifier module(s) is mounted on the right hand side of the enclosure (front
view), with enough space to the right of the module for the following:
• Access to a.c. connections (on some variants);
• Access for tidy routing of cables from the a.c. connections;
• Most enclosure doors are hinged on the left, so door interlocked isolators are mounted on the
right of the enclosure.
3.6.5 Position Of DELTA Transistor Modules
DELTA transistor modules are identified by the 40 way connector position they occupy on the controller. Table
2–10 gives the DELTA designations. For ease of identification, it is recommended that the DELTA transistor
modules are fitted in the same sequence into the enclosure.
3.6.6 Position Of Reactors & Filtering Components
Reactors and other iron-cored components emit strong magnetic fields. When installing these components
ensure that:
• Air-cored reactors have a minimum segregation of 300 mm (12 in) from sensitive components
and control electronics;
• All wound components have an air gap to adjacent steel components to prevent eddy currents.
The minimum recommended gap is 100mm (4”) but smaller distances may be acceptable if
evaluated by the CDM designer.
Iron-cored components (for example an inter-bridge transformer), will usually be mounted on the floor of the
enclosure due to their size and weight.
Sharing reactors are usually fitted adjacent to the DELTA transistor module (typically below) dependant on
cable entry requirements.
Filters are designed to absorb high frequency currents. They must be positioned to have low inductance
connections to the source of the noise and to ensure that the hf current does not bypass the filter. The effect
of cable routing is shown in Figure 3–4.
3.6.7 Position Of Switched Mode Power Supply (SMPS)
An SMPS module is required for each DELTA transistor module.
The SMPS is mounted on the upper front face of the DELTA transistor module, from which it derives a d.c.
power supply.
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