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Parameter Name
Description
Chapter 6 Parameter • 242 ARTDrive V2 series - Instruction Manual
FUNCTION / Power Loss function
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 I01.11 - PL deceleration parameter.
During this phase, a PI regulator (which can be set via I03.10 - PLS P gain and I03.11 -
PLS I gain) tends to keep the DC link voltage with the I03.12 - PLS Vdc ref value.
The control variable is given by the current limit together with the limit set in the I03.13 -
PLS curr lim parameter . 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 I03.12 - 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 I03.12 -
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 I03.21 - PLS active.
If the Mains Voltage is restored within the period set by the I03.20 - 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 I01.10 - PL acceleration. If the Mains Voltage is restored but I03.20 - PLS timeout
expires before the motor reaches the zero speed, it is necessary to give to the drive the
PL timeout ack digital command in order to start the system again and go back to the
starting speed.
The I03.20 - PLS timeout elapsing time can be monitored on a programmable digital
output set as [038] PLS Tout act signal.
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 I03.00 - PLS mains st src.
Such signal can be supplied, for example, by a line converters.
In a configuration with a multiple drive/motor, where a coordinated stop is usually
required, the master drive must have, together with the Enable Master and Enable Slave
programming, an analog output set as I01.21 - PL next fact.
The I01.21 - PL next fact signal sets the ratio between the line speed and the present
speed.
It must be connected to the Speed ratio. When the power loss is detected, the master
speed decreases according to the ratio calculated between Speed ref and Motor speed.
Such ratio states the reference for the slave, in order to decrease the speed in a linear
way according to the speed of the master drive.
The motor functioning at a speed controlled by the master can be monitored
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