Effective 11/2003
Page 35
I.L. 66A7535H02
Figure 5.5 Secondary Injection Test Setup
Run 300% overload to trip the circuit breaker on
“Long
Time.”
Equation for trip time @ 300%
“Max. Long Time” trip(sec) =
Long DelayTime
setting X 4
“Min. Long Time” trip(sec) =
Long Delay Time setting X 2.8
The breaker should trip within the above range and “Long
Time” trip LED should flash. Depress Reset pushbutton to
clear LED indicator.
TEST 5. The “Short Delay” or “Instantaneous” trip
elements (set @ 4x) can also be checked by ramping
current. Close circuit breaker. Place the separate meter in
the “Hold” mode. Ramp current until trip the circuit breaker
trips (expected range of 3.6 to 4.4 A). Appropriate trip LED
should flash.
6.0 BATTERY
6.1 General
The battery plays no part in the protection function of the
trip unit.
As indicated in Figure 3.1, the battery is provided to flash
and power the red LED indication on the mimic curve. The
battery is located under the rating plug door. A battery test
pushbutton and a green Battery Test LED are also pro-
vided.
A second function of the battery is to provide backup power
for the clock chip in the unit. The clock is used to
timestamp trip and alarm events.
On initial installation of the circuit breaker, pull out battery
and remove insulating tab, then re-install the battery
(See
Figure 6.1).
This will activate the battery. Check the battery
status using the Battery Test pushbutton.
6.2 Battery Test
The battery is a long-life, lithium, camera-type unit. Check
the status of the battery at any time by pressing the
Battery Test pushbutton and observing the green LED. If
the Battery Test LED does not light green, replace the
battery. The condition of the battery has no effect on the
protection function of the trip unit. Even with the battery
removed, the unit will still trip the breaker in accordance
with its settings. However, without the battery, the Cause
of Trip LED will not be lighted red if auxiliary power is lost
to the Digitrip. If the battery is replaced, one or more of the
Cause of Trip LEDs may be illuminated. Push the red
Reset/Battery Test button to turn off the indicators; the trip
unit will be ready to indicate the next cause of trip.
RMS Ammeter
with Peak Hold
Capability
Current Source
(AVO Type MS-2
or Equivalent)
5A
COM
(Refer to Figure1.5)
Breaker Aux. Switch
Contacts
(Binding Posts)
Circuit
Breaker
To Secondary Terminals
of Phase A, B or C
A = A-4 & A-19
B = A-5 & A-20
C = A-6 & A-21
25 Ohm - 25W
Stabilizing
Resistor
