Cutler-Hammer Digitrip RMS 510, Инструкция по эксплуатации

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the A P M it may appear as i f the trip unit does not
respond until the current is well-above the set value,
leading the tester to believe there is an error in the
trip unit when there is none. The reason this occurs
is that the single phase test current is not a good
simulation of the normal three phase circuit. If three
phase current had been flowing, the trip unit would
actually have performed correctly. Use the APM for
correct trip unit performance whenever single phase
tests are made.
Plug in the Auxiliary Power Module (Cat. No. PRTAAPM)
to insure control power is available for testing. When the
APM is properly connected the "GREEN" Unit Status
LED will blink on and off about once per second.
5.4.2 Not Tripping the Breaker
1 .
2.
3.
Place the ''Test Amps" selector switch (See Fig. 5)
in one of the six "No Trip" test settings, i.e., 1 , 2, 3,
8, or 1 0, x In, or G F.
Depress the (Black) ''Test" pushbutton and release
it - the test starts when the pushbutton is released.
Should any of the various protection settings be
less than the selected "No Trip" test value, then the
LED related to that function will turn on signifying
successful completion of the test action. Note: Dur­
ing the long delay tests the Long Delay LED
flashes "RED".
4. Reset the trip unit by depressing and releasing the
''Trip Reset" pushbutton. All LEOs lighted by the
"No Trip" test action should turn "OFF".
Should an actual overload or fault condition occur during
an in-service, "No Trip Test" sequence, the protection
function will override the test function, and the circuit
b reaker will trip automatically in accordance with the
actual Time-Current settings.
Note: The "Trip Reset" pushbutton may be
depressed at any time. However, should a test
already be in progress, the test would be aborted.
A test initiated via the integral test panel may be aborted
at any time by depressing the ''Trip Reset" pushbutton.
5.4.3 Tripping the Breaker
1 . Make sure that the circuit breaker is carrying no
current. (See
CAUTION
notes under Section 5.1 .)
NOTE: In the event it is decided to perform a
" Breaker Trip Test" while load current is flowing,
make sure the circuit breaker is carrying no more
than 50% of the Long Delay Current Setting
lr
(The
I.L. 29-8858
trip unit will not execute your instructions to Test
itself, when the load current exceeds 50% of
lr)
2. Place the ''Test Amps" selector switch (See Fig. 5)
in one of the two "Trip" test settings, i.e. , 6T or GFT.
3. Depress the black "Test" pushbutton (See Fig. 5)
and release it - the test is initiated when the push­
button is released.
4. Should any of the various protection settings be
less than the selected ''Test Amps" value, the circuit
breaker will trip and the LED related to that function
will light "RED".
5. Reset the trip unit by depressing and releasing the
''Trip Reset" pushbutton (See Fig. 5). All LEOs
lighted by the ''Trip" test action should turn "OFF".
6.0 BATTERY (INSIDE THE RATIN G PLUG)
6.1 General
The battery has
no
part in the
protection function
of the
trip unit.
As indicated in Figs. 3 and 6, the battery is provided to
maintain the "RED" LED indication of the cause of TRIP
in the Digitrip RMS 51 0 Trip Unit. The battery is located in
the rating plug along with a battery check pushbutton and
a green battery check LED.
6.2 Battery Check
The battery is a long life, lithium photo type unit. The sta­
tus of the battery can be checked at any time by depress­
ing the batte ry
check
pushbutton and obse rving the
"GREEN" LED as shown in Fig. 6. If the battery check
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 set­
tings. However, without the battery, the cause of TRIP
LED will not be lighted "RED". If the battery is replaced
(or if an Auxiliary Power Module is plugged into the trip
unit), one or more of the cause of Trip LED's may be illu­
minated. The user should push the red ''TRI P RESET"
button to turn off the indications, and the trip unit will be
ready to indicate the next cause of trip.
6.3 Battery Replacement
The battery can be easily replaced from the front of the
trip unit by lowering the hinged cover of the rating plug as
shown in Fig. 6. The battery can then be removed by pull­
ing the battery tab as shown in Fig. 6.
Effective May 1 997
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