18
Service Manual
www.microphase.eu
Dc
Capacitor filter (C)
Capacity above the filter effect, helps to recover energy during braking of the motor.
If the converter during braking has the green LED that flashes you must increase the value of the
capacitor (eg. 10.000uF from a 20.000uF)
Fusibili
Fuses (F1) e (F2)
F1 (A) = P (VA) trasfo. / V1
Example: Brush motor with the following data:
In =5 (A)
Ri = 1 (Ohm)
E=48 (V) at nominal speed 3000 (RPM)
Vdc motor = 48 + ( 1 * 5) = 53V
VDC = 53 / 0,83 = 63,8V
63,8V is the VDC voltage request for the power supply. You'll use a transformer with the secondary
V2 = 64 / 1,41= 45Vac
When you use the transformer with V2= 44/45Vac, it is correct.
Misure unit:
E = Ke *n°/1000 (Vdc)
Im = I motor (A)
Ri = Winding resistance (Ohm)
Ke =Voltage constant (V/kRPM)
n° = MAX speed (RPM)
In regards to the capacitor filter we suggest a working voltage of:
*100VDC for Model 65
*200VDC for Model 145
*300VDC for Model 205
Fuses are required on both the primary and secondary of the transformer to protect against harm to
the system and the transformer itself. They need to be of the slow blow type to handle current in-rush
at power-up. Locate the primary fuse (F1) on the hot leg of the AC input power and the secondary fuse
(F2) on the + side of the secondary output, before the rectifier.
Primary of the transformer: Use the formula below to calculate the correct values:
Secondary of the transformer: Use the table below
Power supply construction (continue)
FUSE F2 (A)
SIZE (A)
4
2/4
8
4/8
16
7/14
20
10/20
25
14/28
32
20/40
40
30/60
