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Page 6
CURRENT SHUNT INSTALLATION
1. Select a user-supplied current shunt from Table 1.
2. Disconnect the welding cable coming from one of
the terminals on the weld head.
3. Place the Current Shunt between the open
connections and then securely re-attach all
connections.
4. Plug the Current Input cable into the Current Input
connector on the rear panel.
5. a. Attach the alligator clips on the Input Cable to
the voltage terminals on the Current Shunt.
Polarity is not important.
b. For a more permanent installation, replace the alligator clips with terminals and screw the leads to the
voltage terminals.
6. Select the "OUT" position for the Coil/Shunt Switch on the rear panel.
7. Program the Sentry for the appropriate size Shunt, select Menu/System Menu/System Setup.
CURRENT SHUNT SELECTION
Current Shunts are precision resistors capable of handling very
large currents. The shunt is connected in series with the weld
cable so that the weld current passes through. The Current
Pickup leads are connected to terminals on the shunt so that the
voltage drop can be measured by the Weld Sentry. Current
Shunt voltage drop should be limited to 0.5 volts in order to
minimize weld energy losses. Use the formula Volts ÷ Amps
= Resistance to determine the proper shunt size. The table at
right provides a guide to Current Shunt selection.
WELD SENTRY 2
Figure 4 – Current Shunt Installation
Weld Current
Shunt Resistance
(Max Amps)
50
500
5,000
50,000
Table 1
(milliohms)
10
1
0.1
0.01
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