© Technosoft 2011 32
IDMx40 Technical Reference
d
brakeMAX
M
BR
t
)UU(CE
P
22
2
1
−−
=
where C = C
EXT
+ C
DRIVE
is the overall capacitance on the motor supply (external + drive), i.e:
BR
BRAKE
BR
P
U
R
×
<
2
2
3. to limit the average current below the drive nominal current I
NOM
= 5A (IDM240) / 8A (IDM640)
2
NOM
CYCLE
dBR
BR
It
tP
R
×
×
>
where t
CYCLE
is the time interval between 2 brakes in case of repetitive moves.
4. to be rated for an average power
CYCLE
dBR
AV
t
tP
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
EXT
– the external capacitance on the motor supply
2. If
BR
BRAKE
NOM
CYCLE
dBR
P
U
It
tP
×
>
×
×
2
2
2
either the braking power must be reduced (see Remark 1)
or t
CYCLE
– the time interval between braking cycles must be increased
WARNING!
THE BRAKE RESISTOR MAY HAVE HOT SURFACES
DURING OPERATION.
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