Dr. Livingstone, I Presume WELDWISE 2400 - Manual (Page 98)

0434-INS-400 Rev. C
7-4
Installing the Current Toroid
Before installing the toroid, make a note of the three-digit calibration factor that appears on a
Livingston sticker on the toroid (for example, .388); this value will be used later to enter the toroid
calibration factor.
1. Shut down the welder to be monitored;
2. Install the current toroid:
Unhook the clasp on the toroid ring and place it around a stationary secondary welding cable or
bus. If there is no stationary cable or bus, place it around the secondary with the least movement.
Be sure that the clasp is at least ¾ inch away from the framework of the machine or any ferrous
metal.
Reconnect the clasp on the
toroid and route the cable
away from current-carrying
tooling. Best results are
achieved with the toroid
centered on the cable or
bus: This may be
accomplished by using a
piece of plastic, or a similar
non-conductive material.
Secure the toroid in its
location using cable ties.
The toroid should not be
able to move around after
being secured. The clasp
should also be secured so
that it cannot accidentally
come undone. Keep the
toroid as round as possible;
avoid doubling it over or
securing it in such a way so
that it resembles a figure
'8', as this will result in
inaccurate readings and
Less reliable data.
Figure 7-3 Different ways to mount a toroid