34
AXOR Industries
Service Manual
Nano Mack
®
ver.1 rev.11/'19
2.8 Power supply connections
POWER SUPPLY from transformer
Note:
• We suggest to insert the
F
1
fuse (
see cap. 1.3 Technical Data on page 11
).
For the
power supply rating
use the scheme and the indications below:
AC
Fp
Fs
V1
V2
C
RS
-
+
+AT
-AT
+
-
∼
∼
∼
∼
Transformer:
The drive has the internal zero signal connected with the negative pole (-AT), consequently
don’t
use auto-transformers
.
The factory recommends using transformers with the secondary winding that must be delta/triangle
connected.
Voltage
: The primary voltage depends on the available net voltage; while the secondary voltage
will be calculated according to the motor's characteristics and according to the voltage drive range,
using the value below:
V1(ac) = Vmotor
0,9 x 1.36
where:
Vmotor = Emax + (Ri x In)
Vmotor
= This is the voltage between armature motor at max speed and nominal stall torque.
Emax
= CEMF at max work speed (similar to max voltage, at max motor speed and no load).
Ri
= Armature motor resistance with brushes.
In
= Rated current at nominal torque.
The factory suggests keeping a margin by choosing AC voltage to avoid too high voltage during the
deceleration phases of the motor.
F
1
+AT
-AT
PS
POWER SOURCE
Nano Mack
+ AT
- AT
0V
+V
