User`s guide

B
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16 Conver
g
ence and “Time Step Too Small Errors”
The Last node voltages tried... trailer shows the voltages
tried at the last Newton-Raphson iteration. If any of the nodes
have unreasonable large values this is a clue that these nodes are
related to the problem. “These voltages failed to converge” lists
the specific nodes which did not settle onto consistent values. It
also shows their values for the last two iterations. “These supply
currents failed converge” does the same for currents through
voltage sources and inductors. If any of the listed numbers are
+/- 1e10 then that is an indication that the value is being clipped
from an unreasonable value. Finally, “These devices failed to
converge” shows devices whose terminal currents or core fluxes
did not settle onto consistent values.
The message gives a clue as to the part of the circuit which is
causing the problem. Looking at those devices and/or nodes for
the problems discussed above is recommended.