AV-300i Version 2 User’s Guide
—————— Function Description ——————
Ch.1
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1.11.2 Power Loss Control (Power Loss Ctrl)
The Function allows to control a power loss or a break of the Mains voltage.
In the
configurations, via the PL function sel parameter, it is possible to set several methods to control a possible
power loss:
PL Off the function is not active
PL ridethru with this setting it is possible to let the motor shaft rotate as long as possible during some
Mains holes. The DC link voltage is controlled in order to be kept slightly higher than the
Undervoltage threshold, thus minimizing the losses. In this case the Mains hole is consid-
ered to be temporary and a crossing attempt is performed
The control variable is an additional reference for the torque current (negative).
PL stop it is a controlled stop during which, through the energy recovered from the load, the
motor is constantly controlled. The DC link voltage is controlled in order to be kept
closed to the PLS Vdc ref reference (internal value, it is usually closed to the Overvolt-
age voltage - standard 648V).
In this case the aim is to try to perform a controlled stop of the machine.
The control variable is the torque current limit.
A signal, PL Next factor, supplies the ratio between the motor speed and the speed reference. By connecting it
to the speed ratio of the slave drive, it is possible to obtain the line synchronism.
The settings of Powerloss ridethru and Powerloss stop can be performed in the specific submenus (see the
following paragraphs).
NOTE! This function is not active in case of a functioning condition with a 230V main voltage.
Description:
STOP OPTION Power loss ctrl
Pwrloss ctrl cfg
PL function sel
PL acceleration
PL deceleration
Pwrloss ctrl mon
PL next active
PL next factor
STOP OPTION SAVE PERAMETERS
The following functions are common to the functionalities. The specific sections are described on the following pages.
Power loss ctrl cfg
PL function sel It allows to make a selection among the PL stop, PL ridethru and Off function.
This function has to be enabled only on the line Master drive.
PL acceleration
setting of the acceleration time when the powerloss stop function is active. (standard 100 rpm/s).
PL deceleration A gradual deceleration allows to avoid sudden torque changes when the powerloss
stop function is active. The ramp, anyway, must be so fast as to allow the inter
vention of the function itself.(standard 10000 rpm/s).
PL next active It states that the slave motor speed is equal to the master motor speed.
PL next factor Relationship between Ramp ref / Speed ref and Motor speed. It is the slave
reference in order to decrease the speed, in a linear way, according to the
master drive speed.
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