DCF506-0140-51 DCS Thyristor Power Converters

Two supports should be mounted inside the enclosure in such a way, that they
can carry the converter’s weight when placing the converter later on. The minimum distance between the supports should not be less then 480 mm because
of electrical clearance (DC busbars).
A L-shape support as indicated will allow to place the converter temporarily
close to the front end of the support (weight still taken by a lifting device) and
then push it back to the back plate of the enclosure. The upper and lower holes
in the back plate of the converter should be used to fix the converter in that position.

The units’ power loss is made up of several different components:
• current-dependent losses PV-I
– of the thyristors
– of the fuses
– of the busbar system
• voltage-dependent losses PV-U
– snubber circuit of the thyristors (worst case)
– thyristors at di/dt < 20 A/µs
• almost constant losses PV-C
– unit electronics
– unit fan
– field supply

DCF506-0140-51

Depending on what you want to achieve by your power-loss study, you must make up your mind on the
following points:
• Efficiency calculation for the drive system concerned:
For this purpose, all the power-loss components mentioned above (and additionally the
losses caused, for instance, by the motor fan,
line reactor, cabling of network/power converter/motor, field supply unit and matching transformer, etc.) must be added.
• Fan losses can be estimated by 95% of the fan
power consumption (see table 2.5/2).