Operations to Lockout
The control can be set to provide 1, 2, 3, or 4 operations
to lockout, by positioning one of the DIP switches labeled
S2 to the ON position (Figure 5). If more than one switch
is selected, only the lowest switch value will be enabled.
If none are selected, the control defaults to 4 operations.
Operations on TCC Number 1
The control can be set to provide 0, 1, 2, 3, or 4 opera-
tions on TCC 1, by positioning one of the DIP switches
labeled S3 to the ON position (Figure 5). If none are select-
ed, the control defaults to zero operations. If more than
one switch is selected, all operations will be on TCC 1.
Minimum Response Time Enable
To achieve coordination of in-line fault-interrupting
devices, where fault levels would cause simultaneous
tripping, the minimum response time function will inhibit
tripping until a programmed time has elapsed. The mini-
mum response time function can be enabled on opera-
tion 1, 2, 3, and/or 4, by selecting any of the desired DIP
switches labeled S4 (Figure 5).
Minimum Response Time Setting
The minimum response time setting is established by
positioning the DIP switches labeled S5 (see Figure 5).
Minimum response time can be programmed from 10
through 1280 milliseconds, in 10 millisecond increments.
The programmed time setting equals the sum of the values
of the switches in the On position plus 10 milliseconds.
Time–Current Curve Characteristics
The VXE time–current characteristic (TCC) curves are
established by individual circuit cards that plug into the
circuit board of the control (Figure 4). Two TCC plug-in
cards are required for proper operation.
The available plug-in time current characteristic curves,
and the TCC modifiers available for the electronic control,
enable the VXE to meet a wide variety of application
requirements and simplify coordination with other protec-
tive devices in the distribution system.
All timing starts at initiation of a fault or when closing into
a fault. TCC circuit cards are interchangeable between
sockets TCC1 and TCC2. However, fast curves are nor-
mally used in TCC1, and delayed response curves are
normally used in TCC2.
Time–Current Curve Modifiers
The DIP switches labeled S6 (Figure 5) are used to mod-
ify the shape of the time–current curve produced by the
TCC plug-in card for TCC1 and/or TCC2. Each TCC
plug-in card can produce 4 curves (Unmodified, Mod 1,
Mod 2, or Mod 3).
The TCC modifier is the sum of the values of the DIP
switches. For example, TCC1 is unmodified when both
DIP switches are in the Off position. To modify TCC1 to
obtain the Mod 3 modification, move TCC1 DIP switches
1 and 2 to the On position.
Reclose Time
The reclose time setting is established by positioning the
DIP switches labeled S7 (Figure 5). Reclose time, the
open interval between fault timings, can be programmed
from 1 through 64 seconds, in 1-second increments.
Programmed reclose time is the sum of the value of all
DIP switches in the On position plus 1 second.
Reset Time
The reset-after-successful-reclose time setting is
established by positioning the DIP switches labeled S8
(Figure 5). Reset time can be programmed from 1
through 124 seconds, in 1-second increments.
Programmed reset time is the sum of the value of all DIP
switches in the On position plus 1 second.
Cold-Load Pickup
After the recloser has been closed from lockout, either
manually or remotely, cold-load pickup will be active for the
programmed time interval. During this interval, the control
will be in the one-operation-to-lockout mode, and over-
current timing will be on time–current curve number 2. If
no overcurrent is present during the programmed time
interval, the control will reset and the lockout indicator will
flip from orange to black.
The cold-load pickup time setting is established by posi-
tioning the DIP switches labeled S9 (Figure 5). The cold-
load pickup time can be programmed from 0 to 127.5
seconds in 0.5-second increments. Programmed cold-
load pickup time is the sum of the value of all DIP switch-
es in the On position.
Control Lockout Indicator
Control lockout is indicated by a lockout indicator located
at the bottom of the control cabinet. A round orange tar-
get (shown in Figure 4) is displayed when the control is
in lockout. When the control is not in lockout, the display
is black.
The control lockout indicator will not change status if
cold-load pickup is active until the cold-load pickup time
interval elapses.
S280-16-1
9
To Next Page
Loading...
