GEFRAN-SIEI ARTDrive Vector V2 Series - Power Dip Ride Through Data and Restart Setup

72 • Chapter 4 Wiring Procedure ARTDrive V2 series - Instruction Manual
4.10 Power Dip Ride Through Data and Restart Setup
The ARTDrive has a 3-phase full-wave rectifier feeding the DC link.
If the DC link reaches the Undervoltage threshold for its voltage input (see table
4.10.1), the ARTDrive will disable the Drive, and generate an undervoltage alarm.
The undervoltage alarm can latch & trip the drive immediately, or be programmed
to reset itself and restart. The undervoltage alarm settings define how many
restarts are permitted. There is a ‘restart time’ parameter that sets how long the
undervoltage condition can exist before the ARTDrive gives up on the reset.
The DC link feeds the ARTDrive power supply. If the DC link goes below 250
VDC the electronics reset as if just powered up. The capacity of the DC link
between the undervoltage shutdown of the Drivesection, the 250 VDC power
supply threshold, and the power draw of the ARTDrive electronics & cooling fan
determine how long the drive stays up under power dips or power loss.
The DC link can have extra capacitance added externally to the DC link to add
time to keep the DC link above 250 VDC as long as possible. The following
tables calculate how long the Drive can keep the power above 250 VDC for
control power if the maximum amount of capacitance is added externally.
Remember, adding capacitance holds in the power supply longer, but also takes
longer to recharge.
The survival of an input power dip without shutting down the Drive section depends
on the relative load (energy) that the DC bus has to output, and the magnitude
and duration of the power dip. A power dip needs to be below the DC undervoltage
threshold before the drive would even see any trip condition from it.
Without external capacitors, as an estimate, a power dip of 1 cycle (16.6ms @
60Hz) when the motor is at full load will cause an undervoltage trip.
The undervoltage trip time can be calculated by means of the following formula:
t=
(U -
dc
2
U ) (C + C )
Buff std ext
2
2P
am
10
6
where:
t: undervoltage trip time [ms]
U
dc
: DC link voltage [V]
U
buff
: trip threshold voltage [V]
C
Std
: DC link capacitance [μF]
C
ext
: external capacitance [μF]
P
am
: motor power consumption [W]
P
am
depends on the motor load conditions:
- at full load, it can be calculated as follows:
fA028
P
am
P
m
h
m
=
where:
P
m
: motor rated power