68
6. Press
the
TIMER SETUP
Button. The following screen should be displayed.
See
TIMER SETUP
Screen description for desired setting changes. It is recommended,
whether testing single pole or three-pole circuit breakers, select the
CURR X
(Current
Actuate) stop mode. The Timer stops when the
device under test interrupts the
CURRENT MAIN output
. The
CURR X
position is used when the device under test
has no contacts other than those used to pass current (such as a single-pole circuit
breaker). Settings for a typical molded case circuit breaker timing test are as follows,
7.
Select Start Option to
INITIATE
.
8.
Select Stop Option to
CURR X
(Current Actuate). Note that if the
CA
mode was
selected earlier, the
CURR X
option was automatically selected for you.
9.
Select Stop Latch
ON
, if not already set ON.
10. Press
PREV SCREEN
.
11. Press
the
INIT
Button. The current turns ON at the value set in Momentary
mode. The timer starts. Breaker trips. Output turns OFF. Timer Stops. Record
trip time.
IMPORTANT
NOTE
Some types of circuit breakers are intended to trip only under high-current fault
conditions, usually ten times (10X) rated current. They have only instantaneous
characteristics that require much higher test currents than the SR-98 can
produce, and therefore cannot be tested using the procedure described above.
Refer to the Megger catalog for listing of High Current Testing Products.
Summary of Contents for SR-98
Page 93: ...87...
