1.8. 33-790-11
Figure 63 is the Amptector trip unit with front cover
removed, showing all
of
the calibration marks
on
the dials
and trip indicators. The ranges of current settings
in
mul-
tiples
of
sensor rating and time delay are as follows:
1.
Long-delay pick-up
.5
to 1.25 X sensor rating
2.
Long-delay 4 to 36 seconds, at 6 X
sensor rating
Over these ranges tripping will always occur within the
time band shown
on
Curve
No.
2,
page 60. The bottom of
the band is called the resettable delay. If the overload
subsides
in
less than the resettable delay time, resetting
of
the Amptector trip unit will occur within a few cycles
after the load drops
to
less than 90%
of
the pick-up set-
ting.
3.
Short-delay pick-up 4 to
10
X sensor rating
4.
Short delay .18 seconds
to
.50 seconds
or
11
to 30 cycles at 60
Hz,
at 2.5 X pick-up setting.
Over these ranges tripping will always occur within the
time band shown
on
Curve
No.
2,
page 60. Although the
time adjustment
is
continuous, three time bands are cali-
brated as shown
on
the curve.
5.
Instantaneous pick-up 4 to
12
X sensor rating
·scREW
mnVER
CALIBRATION
SLOTS
LONG
DELAY
CURRENT---
!Y!CKUP
()_$TO
L?5X
SENSOR
RATING
INSTANTl•N£0US----
P!CKUP 4
TO
12X
SENSOR
RATING
'SCREWURlVER
CALIBRATION
SLOTS
GROUNU
CURRENT---.
PICKUP
Page 57
6.
Ground current pick-up See table
on
top of trip unit
or
on
Curve
No.
2.
7.
Ground delay time .22 to .50 seconds
13
to
30 cycles at 60
Hz
Six different combinations of the above trip elements are
provided. These combinations with the corresponding
Amptector I-A model designations are as follows:
1.
Long Delay
Instantaneous
LI
2.
Long Delay
Instantaneous
Ground
LIG
3.
Long Delay
Short Delay
LS
4.
Long Delay
Short Delay
Ground
5.
Long Delay
Short Delay
Instantaneous
Ground
6.
Long Delay
Short Delay
Instantaneous
LSG
LSIG
LSI
GROUND
TRIP
----INDICATOR
OVERLOAD
TRIP
INDICATOR
LONG
DELAY
----TIME
4
TO
36
SECONDS
SC!OIH
C!RC\.)IT
TRIP
INDICATOR
SHORT
DELAY
CURRENT
PICKUP
4
TO
10X
SHORT
DELAY
TIME
0,
18
TO CU\0 SECONDS,
AT
2
5X
PICKUP
SETHNG
S£NSQfl
RATING
*See Section 8.4
of
Text for Explanation
Fig.
63 Amptector I-A Trip Unit with Front Cover Removed (396706)
Effective October 1998
Courtesy of NationalSwitchgear.com
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