GEFRAN-SIEI ARTDrive Vector V2 400Vac Series Instruction Manual Download Page 242

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Index

[Unit] Access Default

Min/Max

Format Reg.Mode Level Ipa

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