Static Time Delay; Undervoltage Tripping Device - GE AK-2A-15 User Maintenance Manual

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breaker having the longer setting and higher pick­
up, provided the fault is on the part of the line
protected by the breaker having the lower setting.
For the exact characteristics and setting of
each breaker in a selective system, reference
should be made to a coordination chart for the
particular system .

STATIC TIME DELAY

UNDERVOLTAGE TRIPPING DEVICE

The Static Time Delay Undervoltage Tripping
Device consists of an undervoltage device mounted
on the breaker, a static time delay box m::mnted
separately from the breaker and a control power
transformer which is also mounted separately from
the breaker when the reference voltage is ;Jther
than D C ., 2 08V AC or 2 3 0V AC . Refer to wiring
diagram 0102 C3 698 (Figure 2 6) .
The voltage 208V A C o r 230V A C , to be
monitored is connected to terminals #1 and #2
of the time delay box.
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(Figures 23, 2 4 , and 2 5 )
The undervoltage device
o n the breaker i s always connected through either
its secondary disconnects or terminal board, tp
terminals #4 and #5 of the time delay box.
The undervoltage device is set to pickup at
approximately 80% of bus voltage and drop out
between 30% and 60%.
The undervoltage device coil circuit is con­
tinuously rated and will remain picked up as long
as the voltage remains above the predetermined
drop out voltage. The time delay is field adjust­
able between 1 and 5 seconds, it is factory set at
the minimum setting, and once the time delay is
established, it is consistent.
No more than one undervoltage device should
be connected to a static time delay box.
The Static Time Delay Undervoltage can also
be furnished in conjunction with the termotector
control package, as shown on wiring diagram
0 1 02 C3 699 (Figure 2 7 ) . Overheating of the motor
windings causes the termotector, imbedded in the
motor windings, to open and allow the
of the control box to instantaneously trip the
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