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SPEED DEVIATION (CLV)
mmand
and the feedback speed becomes large. Speed deviation is the difference between [dA--08]
When the absolute value of speed deviation has exceeded [bb-83] Speed deviation error detection level and [bb-84] Speed deviation
error detection time has elapsed, it is judged as a speed deviation error.
The speed deviation error mode can be configured for the internal program to generate the fault (E52) or set for the standard VFD
fault E105. The internal program has an added loop logic in which the speed deviation needs to be confirmed for a preset amount of
program cycles which helps prevent nuisance trips.
NOTE – A sudden increase in load like shock loading can cause a speed deviation error (E52 / E105).
NOTE – The speed deviation function cannot be disabled when operating in closed loop (AA121 = 10) because the function is a safety
function and is referenced to detect a problem with the encoder feedback signals.
Speed deviation error mode
bb-82
0 = E52 error
1 = E105 error
Speed deviation error level
bb-83
Speed deviation error detection time
bb-84 0.1 sec
Speed deviation program cycles
* valid when bb-82 = 0
UE-58 5 cycles
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