Long-Time Pickup; Long-Time Delay; Short-Time Pickup - GE MicroVersaTrip Plus Series User Manual

2.

Long-Time Pickup

The first setup-mode display is always the long-time
pickup setpoint, as illustrated in Figure
point establishes the breaker's nominal ampere rat­
ing, as a fraction of the rating plug value,
x.LT,
x
LT multiplier
( x.LT
=
scroll through the available choices. Press
store the desired set point.
.� ,,
. =- Lf
LT
Figure 10. Trip Unit display for long-time pickup.
The choices for UL breakers are
in steps of 0.05. The pickup value tolerance band
xln
is 0% to +20% of the set point.
The choices for ANSI breakers are
in steps of 0.05 . The pickup value is defined for
xln ,
-1 0% to +10% of the set point.
Figure 1 1 illustrates the long-time pickup settings.
Q)
E
i=
Current
Figure 1 1. Time-current curve illustrating long-time pickup.

Long-Time Delay

The Trip Unit display for long-time delay is illus­
trated in Figure 1 2. This function allows normal
momentary overloads without nuisance tripping.
The time delays at the lower limit of the bands at
600% of the long-time current setting,
1 0 . This set
Press the key to
xln ) . VALU E
ENTER
SETUP
xln
PI C KUP
0.50 to 1 .00
0.50 to 1 . 1 0 times
Pickup Settings
are listed
x.LT,
in Table 1 1 . Figure
delay on trip time. Press the
through the four choices of time-delay bands. Press
to store the desired value.
ENTER
xln
to
LT
Figure 12.
times
Table 1 1. Lower-limit delays for long-time delay bands.
Q)
E
i=
Figure 13. Time-current curve illustrating long-time delay.

Short-Time Pickup

The short-time pickup function establishes the cur­
rent at which short-time trip is activated. Short-time
pickup is coupled with long-time pickup and the
choices of pickup settings are from
the long-time setting,
Trip Unit display is illustrated in Figure
16
13 illustrates the effect of this
VAL U E
'
'
DELAY
Trip Unit display for long-time delay.
Band
Delay , sec
1 2.4
2 4 .9
3 9.8
4 20
Time-Delay
/ Bands
Current
1 .5
in steps of
x.LT,
key to cycle
SETUP
to 9.0 times
0.5 x.LT. The
1 4 .