Long-Time Pickup; Long-Time Delay; Short-Time Pickup; Trip Unit Display For Long-Time Pickup - GE MicroVersaTrip Plus User Manual

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units
Chapter 2. Setup Mode

Long-Time Pickup

The first setup-mode display is always the long-time
pickup setpoint, as illustrated in Figure 10. This set
point establishes the breaker's nominal ampere rat-
ing, xLT , as a fraction of the rating plug value, xIn
( xLT = LT multiplier x xIn ). Press the
scroll through the available choices. Press
store the desired set point.
Figure 10. Trip Unit display for long-time pickup.
The choices for UL breakers are 0.50 to 1.00 times
xln in steps of 0.05. The pickup value tolerance band
is 0% to +20% of the set point.
The choices for ANSI breakers are 0.50 to 1.10 times
xln , in steps of 0.05. The pickup value is defined for
−10% to +10% of the set point.
Figure 11 illustrates the long-time pickup settings.
Figure 11. Time-current curve illustrating long-time pickup.

Long-Time Delay

The Trip Unit display for long-time delay is illus-
trated in Figure 12. 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, xLT , are listed
in Table 11. Figure 13 illustrates the effect of this
delay on trip time. Press the
through the four choices of time-delay bands. Press
ENTER
key to
VALUE
to
ENTER
Table 11. Lower-limit delays for long-time delay bands.
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 1.5 to 9.0 times
the long-time setting, xLT , in steps of 0.5 xLT . The
Trip Unit display is illustrated in Figure 14.
16
to store the desired value.
Figure 12. Trip Unit display for long-time delay.
B B B B a a a a n n n n d d d d D D D D e e e e l l l l a a a a y y y y , , , , s s s s e e e e c c c c
1
2
3
4
key to cycle
V A L U E
2.4
4.9
9.8
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