
Technosoft 2013
54
iPOS360x MX Technical Reference
In case of a linear motor and load, the motor inertia J
M
and the load inertia J
L
will be replaced by
the motor mass and the load mass measured in [kg], the angular speed
M
will become linear
speed measured in [m/s] and the friction torque T
F
will become friction force measured in [N].
Option 2. Connect a brake resistor R
BR
between phase BR/B- (pins A25-A28) and ground (pins
A23+A24+B23+B24), and activate the software option of dynamic braking (see below).
This option is not available when the drive is used with a step motor.
The dynamic braking option can be found in the Drive Setup dialogue within EasyMotion /
EasySetup. The braking will occur when DC bus voltage increases over U
BRAKE
. This parameter
(U
BRAKE
) should be adjusted depending on the nominal motor supply. Optimally (from a braking point
of view), U
BRAKE
should be a few volts above the maximum nominal supply voltage. This setting will
activate the brake resistor earlier, before reaching dangerous voltages
–
when the over-voltage
protection will stop the drive. Of course, U
BRAKE
must always be less than U
MAX
–
the over-voltage
protection threshold.
Remark:
This option can be combined with an external capacitor whose value is not enough to
absorb the entire regenerative energy E
M
but can help reducing the brake resistor size.
Brake resistor selection
The brake resistor value must be chosen to respect the following conditions:
1. to limit the maximum current below the drive peak current I
PEAK
= 10A
PEAK
MAX
BR
I
U
R
2. to sustain the required
braking power
:
d
brake
MAX
M
BR
t
)
U
U
(
C
E
P
2
2
2
1
where C is the capacitance on the motor supply (external), i.e:
BR
BRAKE
BR
P
U
R
2
2
3. to limit the average current below the drive nominal current I
NOM
=4A
2
NOM
CYCLE
d
BR
BR
I
t
t
P
R
where t
CYCLE
is the time interval between 2 brakes in case of repetitive moves.
4. to be rated for an average power
CY CLE
d
BR
AV
t
t
P
P
and a peak power
BR
MAX
PEAK
R
U
P
2
Remarks:
1. If
BR
BRAKE
PEAK
MAX
P
U
I
U
2
2
the braking power P
BR
must be reduced by increasing either t
d
–
the
time to decelerate or C
–
the external capacitor on the motor supply
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