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Technosoft 2019
28
iPOS80x0 BX-CAN/-CAT Technical Reference
2
NOM
CYCLE
d
CR
CR
I
t
t
P
R
×
×
>
where t
CYCLE
is the time interval between 2 voltage increase cycles in case of repetitive moves.
4. to be rated for an average power
CYCLE
d
CR
AV
t
t
P
P
×
=
and a peak power
CR
MAX
PEAK
R
U
P
2
=
Remarks:
1. If
CR
CHOP
PEAK
MAX
P
U
I
U
×
>
2
2
the braking power P
CR
must be reduced by increasing either t
d
– the time to decelerate
or C – the external capacitor on the motor supply
2. If
CR
CHOP
NOM
CYCLE
d
CR
P
U
I
t
t
P
×
>
×
×
2
2
2
either
the braking power must be reduced (see Remark 1) or t
CYCLE
– the time
interval between chopping cycles must be increased
WARNING!
THE CHOPPING RESISTOR MAY HAVE HOT SURFACES DURING
OPERATION.
3.4.8
Serial RS-232 connection
3.4.8.1
Serial RS-232 connection
Figure 3.23.
Serial RS-232 connection
3.4.8.2
Recommendation for wiring
a) If you build the serial cable, you can use a 3-wire shielded cable with shield connected to BOTH ends. Do not
use the shield as GND. The ground wire (pin 1 or 4 of J9) must be included inside the shield, like the 232Rx
and 232Tx signals. All metallic connector shells are connected internally to the Earth connector J1 pin 4.
b) Always power-off all the iPOS80x0 BX-CAN supplies before inserting/removing the RS-232 serial connector
c) Do not rely on an earthed PC to provide the iPOS80x0 GND connection! The drive must be earthed through a
separate circuit. Most communication problems are caused by the lack of such connection
CAUTION!
Do NOT CONNECT/DISCONNECT THE RS-232 CABLE WHILE THE
DRIVE IS PWERED ON. THIS OPERATION CAN DAMAGE THE DRIVE