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Transformer power
The transformer's nominal power is calculated based upon the sum of power from the single motors driven.
Or Better:
P(VA)=Power absorbed by motor 1 + Power absorbed by motor 2+....etc)
Note; however, that in multi-axis applications, the transformer's power can be derated to 30% of its initial
power.
In regards to the filter capacitor we suggest a 100Vdc working voltage. It's capacity value is derived using
the following formula:
C (uF) = P (VA) trafo. / V2 x 2000
V2 = DC Voltage present on capacitor without load.
Such a capacitor is used to filter the straightened voltage from the power supply and to recover energy
during the motor's braking phase..
Discharge resistor
This resistor,discharge the capacitor also when the amplifier is disconnected after the power supply is switch
off.
The value can be calculated with the following formula:
RS (Ohm) = 20 x 1.000.000 / C (uF)
P (W) = V2
2
/ RS
Fuses
Determination of the primary and secondary F1 and F2 transformer fuses.
Such fuses can be replaced with thermomagnetic switches of the same value.
The F1 fuse inserted on the primary protects the transformer from current overloads caused by th
secondary. This fuse is the “Slow” type.
The F2 fuse inserted on the secondary protects the transformer from short circuits caused by the charge or
on the rectifier bridge itself. This fuse is the“Slow”type.
F 1 = P (VA) trafo. x 1,1 / V (primary) ac
F2 for MiniAx 5/10 = 8A
for MiniAx 10/20 = 20A
MAIN-AC
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