GE AV-300i User Manual page 121

PLS mains st src The drive is informed about the restore of the Mains voltage in order to restart the
Pwr loss stop cfg
PLS P gain
PLS I gain
PLS Vdc ref
PLS cur lim
PLS timeout
Pwr loss stop mon
PLS active
When the PLS timeout has expired, a PLS timeout act alarm is given. Its reset allows the system to restart.
Pwrloss stop function APPLICATIONS
When the DC link voltage goes under the power loss detection threshold, the Powerloss stop function gets
active. The power loss detection threshold is internally selected in order to be higher than the undervoltage level.
The Drive has a Speed 0 reference with a ramp defined by the PL deceleration parameter (it can be set in
Pwrloss ctrl cfg) .
During this phase, a PI regulator (which can be set via PLS P gain and PLS I gain) tends to keep the DC link
voltage with the PLS Vdc ref value. The control variable is given by the current limit together with the limit set
in the parameter.
PLS curr limit . The deceleration depends therefore on the recovery current and on the load inertia (Higher
inertia equal to longer stopping times).
The deceleration time is used to make the transition to the function activation smoother.
The DC link voltage is regulated according to the value set by the PLS Vdc ref parameter. Its default setting is
lower than 5% as compared to the intervention threshold of the braking unit.
With applications requiring the use of the braking unit, the PLS Vdc ref parameter can be set by hand at a higher
level as compared to the braking threshold.
The device takes advantage of the intervention of the braking unit thus reaching a stop condition in a specific
period of time. Also the current limit defined by the PLS curr limit parameter has to be set in order to meet the
requirements of the braking period.
It is possible to monitor the activity of the power loss stop function on a digital output programmed as PLS active.
If the Mains Voltage is restored within the period set by the PLS timeout parameter, the motor, after reaching
the Speed 0, is automatically brought by the Drive to function again with its starting speed and with a ramp
acceleration time defined by PL acceleration.
If the Mains Voltage is restored but PLS timeout expires before the motor reaches the zero speed, it is neces-
sary to give to the Drive the PL time-out ack digital command in order to start the system again and go back to
the starting speed.
The PLS timeout elapsing time can be monitored on a programmable digital output set as PL time-out sig.
During the power loss period, it is possible to restart the system before the motor has reached the Speed 0 when
the Drive receives a signal stating the Mains Voltage recovery. The signal must be connected to PL mains st
src. Such signal can be supplied, for example, by SR-32 or SM-32 line converters.
AV-300i Version 2 User's Guide
motor before it reaches the zero speed. The command can be given via the keypad, a
programmable digital input, the serial line or the Bus (standard NULL).
Proportional gain in A/V of the PI regulator for the power loss stop function.
Integral gain in A/V/s of the PI regulator for the power loss stop function
Reference for the DC link voltage during the activity period of the power loss stop
function. If the braking unit is used to obtain shorter stopping times, the parameter
setting has then to be higher than the value of the ON threshold on the braking
unit. The value (standard 648V), in any case, has not to be higher than the threshold of
the Overvoltage alarm.
Setting of the torque current limit used during the activity period of the power loss stop
function. When the function is active, the parameter has the priority on T curr lim.
Periodo oltre il quale non è più possibile un riavvio automatico.
Period of time after which no automatic restart is possible.
—————— Function Description ——————
Ch.1
121