V00791
Stall Setting
Starting Current
Scenario 1
Scenario 2
Current
0
Time
Time
Start Successful
0
Time
High V Detection
0
1
1
t
0
t
1
At the time t
1
when the
time r is timed ou t and the
voltage has not bee n
restored, the relay trips on
“Trip Vdip <1 ”
Time
Low V Detection
0
1
Reac. Time
Reac.
Time timer starts when low voltage
condition is detected
. During this period
Stall function is disabled and
Reac
In P rogress is asserted
.
P4962ENa
Figure 76: Adjustable reacceleration authorization - Voltage restored after the set time
14.7 AUTO RE-START AUTHORIZATION RESTORATION SEQUENCE
The Auto Re-start element controls the timing of controlled starts following interruptions. When A
uto Re-start is
enabled, two time delay settings (Reac. Long Time and Reac. Shed Time) become available. Automatic classical
restart is carried out in a set time delay Reac. Long Time or after an extended time delay Reac. Shed Time when
the voltage is restored. The Reac. Long Time threshold setting can be used when it is appropriate to restart the
motor without any staged startup sequence. The Reac. Shed Time threshold setting can be used to cover cases
when restoration is from backup power. There must be substantial intervals between starting different motors to
maintain stability, and/or only critical motors can be started. The diagrams below show the relay behaviour under
different conditions:
Chapter 6 - Current Protection Functions P24xM
152 P24xM-TM-EN-2.1
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