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Generally, PG is A-phase driven when rotation is clockwise (CW) see from the input axis. Also, motor rota-
tion is counter-clockwise (CCW) seen from the output side when Forward Commands are output. Conse-
quently, when motor rotation is forward, PG is normally A-phase driven when a load is applied, and B-phase
driven when a load is not applied.
Detecting PG Open Circuit
Select the stopping method when PG cable disconnected is detected and the PG open circuit (PGO) detection
time.
When the Inverter is operating with the frequency reference set to 1% minimum (except when operating on
direct current), if the speed feedback from PG is greater than the time setting in H7-14, PGO is detected.
Detecting Motor Overspeed
An error is detected when the number of motor rotations exceeds the regulated limit. An overspeed (OS) is
detected when a frequency that exceeds the set value in H7-08 continues for longer than the time set in H7-09.
After detecting an overspeed (OS), the Inverter stops according to the setting in H7-03.
Detecting Speed Difference between the Motor and Speed Reference
An error is detected when the speed deviation (i.e., the difference between the designated speed and the actual
motor speed) is too great. Speed deviation (DEV) is detected after a speed agreement is detected and when the
speed reference and actual workpiece speed are within the setting of L4-02, if a speed deviation great than the
set value in H7-10 continues for longer than the time set in H7-11. After a speed deviation is detected, the
Inverter stops according to the setting in H7-04.
