Technosoft 2018
42
iPOS4808 VX Technical Reference
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
2. If
BR
BRAKE
NOM
CYCLE
d
BR
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 braking cycles must be increased
WARNING!
THE BRAKE RESISTOR MAY HAVE HOT SURFACES
DURING OPERATION.
Serial RS-232 connection
3.4.12.1 Serial RS-232 connection
Figure 3.26. Serial RS-232 connection
3.4.12.2 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 B3 of J1) must be included
inside the shield, like the 232Rx and 232Tx signals
b) Always power-off all the iPOS4808 supplies before inserting/removing the RS-232 serial
connector
c) Do not rely on an earthed PC to provide the iPOS4808 GND connection! The drive must
be earthed through a separate circuit. Most communication problems are caused by the
lack of such connection