1 5
Testing Static Trip II
TM
Devices
2.
Set LONG TIME PICK-UP on “A,” LONG TIME BAND on
6, SHORT TIME PICK-UP fully counter-clockwise, and
INSTANTANEOUS PICK-UP ON 3X
3.
Press the START button.
4.
Raise the current slowly until the relay in the test set
operates. This can be determined audibly and should
occur at 1 .5 amperes ± 10%.
5.
Repeat for the other settings as desired. Avoid maintain-
ing high currents longer than necessary to obtain the
readings. On some static trips the relay can be heard to
“buzz” when the current is held exactly at the PICK-UP
value. This is due to the output transistor turning ON and
OFF as the current varies. Operation of the relay should
be positive if the current is increased by 2 or 3% above
the pick-up value.
Long Time Delay Test
If the time delay is tested at an input current 6 times the pickup
setting, the nominal time delays will be as shown in the table
on the trip device. Maximum and minimum limits can be
determined by reference to the time current characteristic
curves, Figure 7.
1.
Connect the green plug to terminal 1 and the white plug
to terminal 9, the black banana plug to 7 and the red to
8. Connect the black pin plug to TP-1 and the yellow (TP-
3) to TP-3.
2.
Set LONG TIME PICK-UP on “A,” LONG TIME BAND on
1, SHORT TIME and INSTANTANEOUS PICK UPS fully
counterclockwise and SHORT TIME BAND on MAXI-
MUM
3.
Press the START button and adjust the current to 3
amperes (6X “A’’ pick-up).
4.
In turn, press the STOP and the RESET buttons. Allow
time for the ammeter reading to reach zero.
5.
Press the START button. (It is not necessary to hold this
button. Power will be maintained until the Static Trip
times out.)
6.
When the trip device operator, check the reading of the
stop clock against the curves in Figure 7. The reading
should be approximately the same as shown on the
faceplate of the device, but must be within the limits
shown on the curves. If not, recheck all settings and
repeat the test.
7.
Repeat steps 5 and 6 one or more times to verify the test
results .
8.
Repeat for the other phases (by changing green plug to
terminal 2 for phase 2, and terminal 3 for phase 3) time
delay bands and other values of current, as desired. All
test points should fall within the bands of Figure 7. Each
time band should have precisely twice the delay of the
next lower band when all other conditions are the same.
NOTE
When timing at values of current only slightly above pick-up,
line voltage fluctuations may cause detriggering and result in
erroneous operating times. Therefore, it is advisable to watch
the long time pick-up light to note whether trigger voltage is
maintained. In general, it is impractical to test time delay at
less than 10% above pick-up.
Short Time Delay Test
1.
Connect the green plug to terminal 1, the white plug to
terminal 9, the red plug to 8 and the black to 7. The pin
plugs are not needed.
2.
Set LONG TIME PICK-UP on ‘IA,” LONG TIME BAND
on 6, INSTANTANEOUS PICK-UP fully counterclock-
wise, SHORT TIME PICK-UP on 3X (1.5 amperes) and
SHORT TIME BAND on MAXIMUM.
3.
Press the START button and adjust the current to 2
amperes or more, then release both buttons. In turn,
press the STOP and the RESET buttons.
4.
Close the circuit breaker, if desired.
5.
Press the START button, the delay should be .35 to .50
seconds. See Figure 7.
6.
Repeat the SHORT TIME BAND settings of INTERMEDI-
ATE and MINIMUM, compare to Figure 7. The other
phase circuits and different values of current can be
tested if desired. Make current settings as quickly as
possible to avoid overheating.
Ground Time Delay Test
1.
Connect the green plug to terminal 4, the white plug to
terminal 9, the red to terminal 8 and the black to terminal
7 The pin plugs are not needed.
2.
Set GROUND PICK-UP on 15% (0.15 ampere) and
GROUND TIME BAND on MAXIMUM
