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HARDWARE DESCRIPTION
Case
DIAC and DSFC
The DIAC and DSFC relays consist of a
case, cover, support structure, and a
connection plug to make up the electri-
cal connection. The case is shown in
figures 20 and 22. The external con-
nections are shown in figure 18. It has
10 connection points and a CT shorting
bar. As the connection plug is with-
drawn the trip circuit is broken prior to
the current shorting bar engagement.
The window provides visual indication of
the CT shorting.
DIFC
The DIFC relays consist of a molded
case, cover, support structure, and a
connection plug to make up the electri-
cal connection. The case is shown in
figures 20 and 20A. The external con-
nections are shown in figure 19. It has
14 connection points and a visible CT
shorting bar. As the connection plug is
withdrawn the trip circuit is broken prior
to the current shorting bar engagement.
The window provides visual indication of
the CT shorting.
Adjustments
All customer settings for the relay are
accessible from the front of the relay.
The relay cover must be removed to
gain access to the settings. The cover
has provisions for a sealing wire. The
settings are left to right, pickup current
level for the time element, time dial,
curve selection, frequency/reset time,
pickup current level for the instantane-
ous element, and the instantaneous
element time delay. The settings are all
calibrated and are set by turning the
rotary switch to the desired value. The
switches are recessed, a small screw
driver is required to make the adjust-
ment.
The relay may be supplied with one of
three pointer styles as shown. The
color is the color of the indicator, note
the arrow location, all switches are
shown in the 9 :00 position.
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The TOC pickup current is set directly in
Amps with two rotary switches. An arrow
is used to indicate setting position. Set-
ting the TOC or the IOC pickup current
between, but not including 0 and a value
less than minimum 0.5 (5amp) or 0.1
(1Amp) will result in the relay defaulting
to its minimum setting. Setting the TOC
or IOC pickup current to 0 will disable
their respective elements. Although the
time dial can be set to a value less than
minimum the relay will use the minimum
setting.
The relay also provides a front panel trip
circuit test. A actuating lever that must
be pulled and then lifted is provided to
trip the device connected to the relay.
The level directly operates the trip con-
tacts.
Summary of Contents for DIAC
Page 29: ...28 FIGURE 18 DIAC and DSFC External Internal Connections...
Page 30: ...29 FIGURE 19 DIFC External Internal Connections...
Page 31: ...30 FIGURE 20 DIAC Panel Mounting and Drilling...
Page 32: ...31 FIGURE 21 DIFC Panel Mounting and Drilling...
Page 33: ...32 FIGURE 21A SURFACE MOUNTING DIFC...
Page 34: ...33 FIGURE 22 DSFC Panel Mounting and Drilling...
Page 42: ...41 FIGURE 27 9819647 8919648 DIAC Front and Rear Views...
Page 43: ...42 FIGURE 28 8919652 8919653 DIFC Front and Rear Views...
Page 44: ...43 FIGURE 29 8919632 8919661 DSFC Front and Rear Views...