AC-PRO
®
& AC-PRO-II
®
B-292 Secondary Injection Test Set Instruction Manual Rev 1.1
www.utilityrelay.com
Page 7
3.7
Current Preset Push Button
While the Current Preset push button is pushed,
the test set will display the current setting (from
the Amp Coarse and Fine adjust pots) in the
Current (12) display without actually driving
any current to the trip unit.
The sum of the Amp Coarse (14) and Fine (15)
pots is displayed in the Current (12) 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 to the trip unit 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 to the trip unit 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 trip unit the test
current is driven into. It selects between
Phase A, Phase B, Phase C or Ground
Fault (Neutral).
3.11
Frequency Selector
The Frequency selector switch is used to select
the AC test current frequency. This is used to
select either 25, 40, 50 or 60 Hz for AC-PRO.
The selections for AC-PRO-II are 50 or 60
Hertz.
3.12
Contrast Push Button
The Contrast push button changes the contrast
of both the Timer (6) and Current (12) displays.
The push button should be pushed until the
desired contrast is seen in the displays.
3.13
Ground Fault Type Selector Switch
The GF Type Selector switch selects between
the standard "residual" ground fault trip unit
and the special "ground return" ground fault
trip unit.
For AC-PRO, the option label on the front of
the AC-PRO indicates if that trip unit is the
special factory-configured "ground return"
type, with a “GR” suffix in the trip unit part
number.
For AC-PRO-II, Ground Fault Type is a user
setting. It can be set to Residual (standard) or
Ground Return.
Push the GF Type Selector switch so the
correct type of ground fault is selected.
Note: When the GF Type Switch is set to
standard “residual” and Phase switch is set to
A, B, or C, current is injected into the phase
current input and returned through the neutral
current input (to result in zero GF current).
When the GF Type switch is set to “ground
return” and Phase Switch is set to A, B, or C,
current is injected into the Phase input only.
3.14
24V Fuse / Fuseholder
The main 24V fuse is accessible from the front
panel. The fuse is rated 1A/250V max, type
3AG slow blow fuse.
13
14
15
11
9
10
16
19
