Kollmorgen MMC Smart Drive Series, Hardware Manual

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Kollmorgen - June 2014 59
MMC Smart Drive Hardware Manual
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SYSTEM POWER DEVICES
4.4 Isolation Transformers
The MMC Smart Drive does not require the use of isolation transformers. However, a
transformer may be required to match the voltage requirements of the controller to the
available service. To size a transformer for the main AC power inputs, the power
output (KVA) of each axis must be known. This can be derived by calculating the
horsepower for each axis and converting that horsepower into units of watts. If power
is being supplied to more than one motor and a drive, simply add the kW ratings
together from each calculation to get a system kW total.
For an autotransformer, ensure that the phase to neutral/ground voltages do not
exceed the input voltage ratings of the drive.
If you are using the Motions Solutions Sizing Software, the average speed and
average torque data has already been calculated and can be used in the equation. If
you are not sure of the exact speed and torque in your application, record the speed/
torque curve for your drive/motor combination and use the resulting values as a worst
case continuous speed and torque.
Calculations are multiplied by a factor to compensate for the power and loss elements
within a power system. A factor of 2.0 is used with a single phase system and a factor
Table 4-14: MMC-SD-100-460 Line Reactor Specifications
Fundamental
Amperage
Power
Loss
Inductance Weight
Part
Number
250A 231W 0.090 mH 80 lbs. M.3000.1666