Installation 2-9
IQ 2000/5000 Installation Manual
Transformer Sizing
IQ 2000 and IQ 5000 systems do not require isolation transformers. A transformer may be
required, however, to match the voltage requirements of the controller to the available service.
To size a transformer for an IQ 2000 or IQ 5000, 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 f watts. If you are suppling power to more than one motor and drive,
simply add the KW ratings together from each calculation to get a system KW total.
Definitions:
KW = power or “real power”
KVA = apparent power
Transformer KVA rating = (Sum of average output power of each axis) x 2.0
Sizing a transformer with an IQ-2000 PDM-30 drive and H-4075 motor:
Mounting Requirements
Position the PDM in a vertical position on a flat, solid surface that meets the mounting require-
ments for weight, humidity, and temperature listed in Chapter 6, “Specifications.” The
following diagrams list dimensional mounting requirements.
Intro
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 of 1.5 is used with a three phase system. This factor should
minimize the effects of the secondary line voltage sagging in the transformer
during peak current periods.
If you are using the Electro-Craft system sizing program, EasySize™, the aver-
age speed and average torque data has already been calculated and can be
used in the above equation. If you are not sure of the exact speed and torque
in your application, another approach is to look at the speed/torque curve for
your drive/motor combination in the Electro-Craft catalog and use the values
for the worst case continuous speed and torque.
Intro
KVA
Speed RPM()Torque lb in–()×
63 025,
-----------------------------------------------------------------------------------
746Watts
HP
-------------------------
×
KVA
1000Watts
----------------------------
× 2.0×=
KVA
3000RPM 75lb in–×
63 025,
-------------------------------------------------------
746Watts
HP
-------------------------
×
KVA
1000Watts
----------------------------
× 2.0×=
Transformer Size 5.3KVA=
NOTE:
The speed/torque curve information is based upon a drive module input voltage of 230 VAC. For a 115 VAC
input voltage, the maximum speed is reduced by half.
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