ALL-TEST PRO ATPOL II, User Manual

Page: 17 / 109

17
Connecting to Line-To-DC (LDC) Converter Accessory
The Line-To-DC Converter accessory converts the voltage that is being
monitored into DC voltage to run and charge ATPOL II. The applications of
this option are:

Electrical room monitoring where a 120V outlet jack is not available for
your charger

Monitoring where an extension cord from a 120V outlet jack would be a
safety hazard

Monitoring on a rooftop, power pole, or power pad

Reliable charging for the meter when there is concern that an available
120V outlet jack may be switched off by other personnel

Simplified monitoring connections (no need to think about powering
ATPOL II when installed inside a CASW weather-resistant case.
Figure 11 shows the correct method of connecting the LDC to ATPOL II. The LDC comes with two long
red input leads that end with a stackable safety banana plugs. These stackable plugs are to be
inserted directly into two of the inputs of ATPOL II. If you are monitoring power without a neutral, we
recommend plugging them into the V
1
and V
2
inputs. If an external neutral is present, we recommend
plugging them into the V
1
and V
N
inputs. In any case, there needs to be a potential between them of at
least 100 Vrms and no more than 500 Vrms from 50 Hz or 60 Hz power.
The LDC also comes with in-line fuse assemblies plugged into the stackable plugs. These red
assemblies contain 1000V fuses. They provide protection if a short should occur in the LDC. The two
voltage leads that would normally be plugged into ATPOL II are plugged into the loose ends of the in-
line fuses. At this point, ATPOL II is ready to measure voltages as usual and the LDC is connected in
parallel to two of the inputs of ATPOL II. You may wish to remove the in-line fuse assemblies, plug
your voltage leads directly into the stackable plugs, and plug the in-line fuse assemblies between the
loose ends of the voltage leads and the voltage clips. This provides a connection that is electrically
equivalent to the normal connection, but the fuses are physically as close to the power source as
possible. The advantage of this approach is that if one of the voltage leads gets shorted to ground
(perhaps from being cut by a panel door), a fuse quickly blows, providing added protection.
Note: Do not use the LDC without the in-line fuses being connected between it and the
power source. The fuses are the only circuit protection for the LDC.
When the input side of the LDC is fully connected properly, plug the long DC output plug into the DC
input jack of ATPOL II. The red charging indicator near the jack will light up if everything is operating
and connected properly.
Note: If a fuse is burned out or missing, it will appear that there is no voltage at the
source. Verify that the fuses are working properly before assuming that the source is dead.
Injury may occur if you wrongly assume that the source is deactivated.
ATPOL II