Power supply ICOS-PS 3160 series
Installation, use and maintenance manual - EN
Ver. 1.05
53
The following chart refers to single-phase power supply:
The curves refer to gPV 10x38 fuse-links. More precisely, the overload diagnostic intervenes earlier than the
fuse, provided the rated current of the fuses in use is equal to 12A (single-phase) and 20A (three-phase). The
fuse blows only in case of short-circuit or heavy overload, thus avoiding its interruption during normal
operation.
The use of fuses with a different tripping curve may not ensure that they don't blow: the fuse might broke down
in case of overload. If you want to use different fuses, their intervention time should be greater than that of the
power supply unit for all range of expected overload currents (please adopt a proper safety factor, due to the
variability of the fuses characteristics).
6.5 Dynamic braking
The dynamic braking circuit dissipates the energy coming from the load and directed to the power supply unit,
as it usually occurs with servodrives.
More in detail, during the motor braking phase, the mechanical energy due to the slowdown of inertial loads is
converted to electrical energy. Since this energy can not be conveyed to the mains, it is stored in bus
capacitors, thus increasing their voltage. In absence of a braking system, the bus voltage might increase in an
uncontrolled way, thus potentially damaging the devices unless the servodrive is disabled due to overvoltage.
However, this condition is unacceptable, because the motor braking torque would be absent.
