3
3.5
Stop Push Button
The “Stop” push button stops the test current
flow and simultaneously freezes the timer.
3.6
Test Current display
The “Test Current (amps)” LCD display
indicates the true RMS test current in amps,
going to the AC-PRO during a test.
To determine the equivalent CT primary
current:
1-Amp AC-PRO
…multiply the test set current
by the CT rating set in the trip unit.
Example: If the CT rating is 600 and the
test current is 1.50 amps, then the
equivalent primary current is
1.50 X 600 = 900 amps primary
1/2-Amp AC-PRO
…multiply the test set
current by 2 and then multiply by the CT
rating set in the trip unit.
Example: If the CT rating is 600 and the
test current is 0.75 amps, then the
equivalent primary current is
0.75 X 2 X 600 = 900 amps primary
3.7
Current Preset Push Button
While the “Current Preset” push button is
pushed, the test set will display the current
setting (from Amp Coarse and Fine adjust pots)
in the Test Current LCD display without
actually driving any current to the AC-PRO.
The sum of the Amp Coarse and Fine pots is
displayed in the current LCD display and is
continually updated while the Current Preset
switch is pushed. After the current pots are
adjusted to the desired test current as seen on
the display, release the Current Preset push
button. The test set limits the current set point
level to 12.00 amps.
3.8 Amp Coarse Adjust
The “Amps Coarse” adjustment quickly
changes the test current or the test Current
Preset, with clockwise rotation increasing the
value.
3.9
Amp Fine Adjust
The “Amps Fine” adjustment slowly changes
the test current or the test Current Preset, with
clockwise rotation increasing the value.
3.10 Phase
Selector
The “Phase Select” selector switch is used to
select which phase of the AC-PRO the test
current is driven into. It selects between
Phase A, Phase B, Phase C or Ground Fault
(Neutral).
