Motorvision Drawout (MVD) Technical Manual - PBSI Group Ltd

MVD TECHNICAL MANUAL
Undervoltage Restart Time.
This setting determines the allowable off time (the time a relay can be powered off or
without nominal voltage) such that if the power is restored or the voltage returns to
normal within this time a restart can occur.
Voltage loss could be result of upstream supplies changing over, an HV motor starting or
some other condition which causes downstream connected drives to either trip on
undervoltage protection or cause contactors to drop out.
Undervoltage Restart Delay.
Once power has returned the restart delay can be used to help control the sequence of
a process restart after an outage. This is a settable time to hold off automated start
control after voltage restoration.
This can be used to prevent an entire bus system of motor starters from trying to
reaccelerate at the same time.
Restart Sense.
This setting, which can be set to ‘Supply’ or ‘Supply or Reference’, determines the signal
that is examined after a power loss to determine whether an Undervoltage Restart will
occur.
If it is set to ‘Supply’ then after a power loss and when the supply to the relay is active
again a restart will occur.
If it is set to ‘Supply or Reference’ the relay will examine if there is voltage on the Busbars
that supply the motor. Specifically, if the voltage dips below 65% of the line voltage
then a Stop is called, if the voltage is restored to above 65% of the line voltage (within
the set Restart Time) then the MVD will orchestrate the restart. This setting is for the
case where the relay is powered off an Auxiliary supply and not from the supplying Busbars.
Start and Stop Setup Source.
This setting is used to determine the allowable source control for the Start and Stop
signals to the motor.
The Start and Stop signals can come from three different type of input:-
Panel
Remote
Serial
- the buttons on the front of the relay.
- from the digital inputs to the relay.
- through the serial link on the relay.
A matrix is displayed for both the Start and Stop sources and the user can configure
which source an allowable start or stop command signal can come from.
The start and stop permissives configured here transpose directly in the availability
matrix in the drive control page.
UP SELECT
Start Sources
L/R A/M Pan Ser Rem
L A
L M
R A
R M
TEST
DOWN
SAVE &
EXIT
UP SELECT
Stop Sources
L/R A/M Pan Ser Rem
L A
L M
R A
R M
TEST
DOWN
SAVE &
EXIT
AUTO
REMOTE
Drive Control
A M Status MANUAL
L R Status LOCAL
Start Stop
Panel Yes Yes
Serial No Yes
Remote No Yes
OPERATE
EXIT
P&B Engineering Issue 1 03/2008 Page 39