Part
12470
Rev. 2 3/25/99
17
voltage/lower current terminal. Proceed with currentadjustment as in Steps 10 and
11 (see SELECTION OF OUTPUT TERMINAL).
NOTE:
Before starting test, allow time for the thermal element to cool, otherwise incorrect
tripping time may result.
12.
Put ammeter DISPLAY MODE in NORMAL position.
13.
Start test by moving OUTPUT MODE Switch to MAINTAIN position.
NOTE:
Test current may decrease (fall off) during the test because the resistance or
impedance of the test circuit increases as it heats up. Rotate OUTPUT CONTROL
knob clockwise to keep test current at desired value.
14.
When circuit breaker trips, timer stops and output is de-energized. Timer indicates
total elapsed time of the test in seconds or cycles.
15.
Turn test set OFF with POWER ON/OFF Switch.
16.
Record test results on Test Record Card.
IMPORTANT
Some types of circuit breakers are intended to trip only under high current fault condition, usually
ten times (10x) rated current. They have only instantaneous characteristics and therefore will not
trip using usual procedure described above.
INSTANTANEOUS ELEMENT
1.
Set-up CB-832 with:
