IV Peripheral components
IV.1 Isolating transformers
Isolating transformers are required to operate the equipment. In order to ensure that the
installation functions properly and the guarantee conditions are fulfilled, the isolating
transformers must meet the following specification:
Type: 3-phase isolating transformers, with a screen winding to VDE 0550,
in Y/y or Y/D configuration.
Primary voltage: 400V with ±20V taps for adaptation to diverging mains supply
conditions. We recommend using the 420V tap.
Secondary voltage: For 60V DC-link voltage: 43V~
The secondary star point must not be grounded.
Off-load voltage: The permissible off-load voltage rise is approx. 4%
(secondary)
Short-circuit voltage: The relative short-circuit voltage U
K
must be in the range 4% + 1%,
in order to protect the rectifier diodes when switching on and in the
event of overvoltage, in accordance with EN 50178.
A soft-start is necessary for transformers rated above 3kVA
(for single axis systems) or 8kVA (for multi-axis systems).
Power factor: The loading of the transformer with a 3-phase bridge rectifier results
in a power factor l of 0.9.
Overload behaviour: The short-term overload which is typical for servo operation must
not cause damage to the transformer or result in voltage drops
which are larger than the U
K
values.
Seidel isolating transformers (3-phase, rated primary voltage 400V)
Type Power / kW Sec. voltage / V Order- no.
3T0,7K-60 0.7 43 54164
3T1,5K-60 1.5 43 55028
3T3,0K-60 3.0 43 55618
Chapter IV Peripheral components Page IV - 1
Kollmorgen 12.99 Series 04S
Warning !
Using a transformer which does not meet the above specification will affect the
security of operation and could lead to damage to the transistor controller.
We can only guarantee the functionality of the transistor controller if Seidel
transformers are used (see below).
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