184
Diagnostics and Troubleshooting
*Additional information at end of section
Error/Message Description Cause/Solution/Troubleshoot
E.OS
Error
Overspeed
The internal
overspeed limit is
exceeded.
The inverter internal overspeed is dictated as 125% of
the LF.20 Contract Speed. This level is  xed an cannot
be adjusted.
Possible causes of an overspeed error include:
Incorrect setting of the Machine Data parameters
LF.20-25.
The Machine Data parameters are used as a scalar
to convert a linear speed (e.g. ft/min) to a rotary
speed (rpm) used by the inverter. If the machine
data is not set correctly, the overspeed limit may
be calculated too low when control modes which
dictate the drive speed exceed this limit (e.g. it
is possible in Serial Speed control mode for the
controller to command a speed higher than the
overspeed error limit calculated from the machine
data parameters, which could cause inadvertent
overspeed error).
Lack of control
Maximum Torque limit or peak inverter current
reached.
Monitor the motor current to see if it reaches a
current corresponding to the 0.LF.36 Maximum
Torque or the drive Peak Current rating.
0.LF.36 Maximum Torque may be set too low
(default = 150%; Typical for high speed/full
load operation = 200-250%)
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