User Manual Chapter 7 - Parameters Description 103
P.321 Autocapture Ilim P.322 Demagnetiz time
P.323 Autocap f scan t P.323 Autocap V scan t
NOTA!
La configuration above described is refered to the setting of UV Trip mode (P.343) = 0 parameter.
P.340 Undervoltage thr (Undervoltage threshold)
"Undervoltage" alarm (UV) threshold detection.
The undervoltage threshold can be set in a range, within the minimum value allowed and its nominal input
voltage selected.
See the table below for more details.
Here below an example:
S.000 (P.020) Mains voltage parameter = 380Vac
DC UV minimum threshold = 380Vdc
Nominal DC Link = 537Vdc.
P.340 = 0% UV = 380Vdc
P340 = 50%
UV = 380 +
= 458Vdc
(537 - 380) x 50
100
P.341 Max pwrloss time (Maximun power loss time)
It defines the time before the drive trip for undervoltage alarm.
If the main dip lasts a time longer than the one here set, the undervoltage alarm is issued.
P.342 UV alarm storage (Undervoltage alarm storage)
This parameter defines wheter UV alarms have to be stored into the alarm stack during the counting of Max
pwrloss time (see chapter DISPLAY, section Alarm list). The alarm will be displayed with the message "UV".
A signalling of the "undervoltage" condition is available on the digital output as "UV running".
P.343 UV Trip mode (Undervoltage tripping mode)
This function allows the controlled stop of a single drive/motor configuration, in case of a.c. mains power loss.
Its working is correctly carried out, only if the load has a sufficient quantity of kinetics energy (eg. inertial
loads). When the DC link voltage drops under the power loss detection threshold, the function is activated.
Automatically an internal threshold is detected and selected, to be higher than the undervoltage level.
The drive will act in accordance with the setting of the function and the behaviour of the mains. This is described
in the drawings below.
P.343 = 0 Disable A mains power loss, will trip the drive for undervoltage alarm (UV)
P.343 = 1 Coast Through See figure 7.6.11
P.343 = 2 Emg Stop See figure 7.6.12
AC main supply Minimum UV threshold Nominal DC-Bus
110Vac 110Vdc 148Vdc
220Vac 125Vdc 298Vdc
230Vac 125Vdc 310Vdc
240Vac 125Vdc 325Vdc
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