4
3.11 Frequency
Selector
The “Frequency (Hertz)”selector switch is used
to select the AC test current frequency. This is
used to select 25, 40, 50 or 60 Hz.
3.12
Contrast Push Button
The “contrast” push button changes the contrast
of both the timer and current LCD displays.
The switch should be pushed until the desired
contrast is seen in the displays
4.0 Operation
4.1 Connecting to the AC-PRO
The Test Harness makes the connections from
the test set to the AC-PRO (including power for
the AC-PRO). It also provides a connector for
connection to the breaker harness to allow the
AC-PRO to fire the breaker actuator and trip
the breaker.
See Figure 2.
While the power switch is in the off position
(red led in switch off):
1) Connect the round connector on the
Test Harness to the connector on the
test set marked “AC-PRO”. Twist the
outer ring clockwise to fully seat and
lock the connector.
2) Remove the breaker wiring harness
from the “breaker harness” connector
on the AC-PRO (if installed on a
breaker).
3) Connect the female ten-position
terminal block connector on the Test
Harness to the AC-PRO.
4) Connect the small round connector on
the Test Harness to the “24 VAC
auxiliary power” connector on the AC-
PRO.
5) Connect the previously removed
breaker wiring harness connector to the
male ten-position terminal block on the
Test Harness (if installed on a breaker).
6) Once all connections are made the test
set power can be turned on. The AC-
PRO should also power up. (A short
current pulse to the selected AC-PRO
phase can occur on power-up or power-
down which may cause an
instantaneous trip.)
4.2 Select the Frequency
Select the desired frequency of operation using
the “Frequency (Hertz)” selector switch.
This
must match the AC-PRO frequency.
