35
AXOR Industries
Service Manual
Nano Mack
®
ver.1 rev.11/'19
Power:
nominal transformer power is referred to each motor power sum, on multi-axes applications:
P(VA) = (Pass M1 + Pass M2 + ....) x 1,25
Where:
Pass M = (n x Cn)/9,55
(Pass M = absorbed motor power in VA, n = speed in RPM,
Cn = rated torque in Nm).
Notice: If multi-axis application is required, the transformer power rating may be reduced by 30%
respecting the original equation.
Fuses
A fuse should be fitted into each of the transformer's primary and secondary windings, Fp and Fs.
These fuses may be replaced with a magneto-termic switch with the same value.
The Fp fuse mounted on the primary protects the transformer.
This fuse must be the "slow" type.
Fp = P(VA) trafo. x 1,1
V(primary)ac
The Fs fuse mounted on the secondary also protects the transformer and that fuse must be the
"slow" type.
Fs = P(VA) trafo. x 1,1
V1(secondary)ac
Filter capacitors
The capacitor filters the voltage from single phase bridge and recoveries the energy from the motor
during the deceleration phase. Capacitor’s value can be obtained with following formula:
C(uF) = P(VA) trasf. x 2 000
V2
where: V2 = capacitor voltage between positive and negative at no load speed.
About the filter capacitor, the factory recommends one with a working voltage of at least 100 Vdc.
DISCHARGE RESISTANCE
This resistance discharges the capacitor when amplifier is disconnected after power supply switch off.
The value can be calculated with the following formula :
RS (Ohm) = 20 000 000
C(uF)
P(W)
=
V2
2
RS
2.8 Power supply connections
