Technosoft iPOS360x MX, Техническое описание, Страница: 65 / 116

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Technosoft 2013 53 iPOS360x MX Technical Reference
3.4.11.2 Recommendations for Supply Wiring
Always provide a nearby capacitor on the motor supply lines. The capacitor should be located within
10cm of the iPOS360x MX J2 connector, max. 20cm. The minimum recommended capacitance is
330µF for iPOS3604, or 220µF for iPOS3602, always rated at the appropriate voltage.
Use short, thick wires between the iPOS360x and the motor power supply. Connect power supply
wires to all the indicated pins. If the wires are longer than 2 meters, use twisted wires for the supply
and ground return. For wires longer than 20 meters, add a capacitor of at least 2,2
00μF (rated at
an appropriate voltage) right on the terminals of the i
POS3604, respectively 1,000μF for the
iPOS3602.
3.4.11.3 Recommendations to limit over-voltage during braking
During abrupt motion brakes or reversals the regenerative energy is injected into the motor power
supply. This may cause an increase of the motor supply voltage (depending on the power supply
characteristics). If the voltage bypasses 39V, the drive over-voltage protection is triggered and the
drive power stage is disabled. In order to avoid this situation you have 2 options:
Option 1. Add a capacitor on the motor supply big enough to absorb the overall energy flowing
back to the supply. The capacitor must be rated to a voltage equal or bigger than the maximum
expected over-voltage and can be sized with the formula:
2 2
2
NOM MAX
M
U U
E
C



where:
U
MAX
= 39V is the over-voltage protection limit
U
NOM
is the nominal motor supply voltage
E
M
= the overall energy flowing back to the supply in Joules. In case of a rotary motor
and load, E
M
can be computed with the formula:
F
M d
d Ph
2
M final initial L M
2
M L M M
T
2
t
t R 3I ) h - )g(h m (m ) J (J
2
1
E


     
where:
J
M
–
total rotor inertia [kgm 2 ]
J
L
–
total load inertia as seen at motor shaft after transmission [kgm
2
]

M
–
motor angular speed before deceleration [rad/s]
m
M
–
motor mass [kg]
–
when motor is moving in a non-horizontal plane
m
L
–
load mass [kg]
–
when load is moving in a non-horizontal plane
g
–
gravitational acceleration i.e. 9.8 [m/s 2 ]
h
initial
–
initial system altitude [m]
h
final
–
final system altitude [m]
I
M
–
motor current during deceleration [A
RMS
/phase]
R
Ph
–
motor phase resistance [

]
t
d
–
time to decelerate [s]
T
F
–
total friction torque as seen at motor shaft [Nm]
–
includes load and transmission
Kinetic energy Copper losses Friction losses Potential energy