6-74
6
îš‹ Fault Detection
îš„Related Parameters
îš„Detecting PG Open Circuit During Run (F1-02 and F1-14)
Parameter F1-02 selects the stopping method when a PG disconnection is detected.
PG open (PGO) is detected only when the inverter is running at least with a frequency reference higher than
1% of the maximum output frequency or above the minimum frequency (E1-09) and the PG feedback signal is
missing for the time set in F1-14 or longer.
îš„Detecting Motor Overspeed (F1-03, F1-08 and F1-09)
An overspeed (OS) is detected when the motor speed continues to exceed the set frequency value in F1-08 for
a time longer than set in F1-09. After detecting an overspeed (OS), the Inverter stops according to the setting
in F1-03.
îš„Detecting a Speed Deviation between the Motor and Speed Reference (F1-04, F1-10
and F1-11)
A speed deviation fault is detected when the speed deviation (i.e., the difference between the speed reference
and the actual motor speed) is too large. Speed deviation (DEV) is detected only after a speed agreement
(speed reference and actual motor speed are within the setting range of L4-02) and if a speed deviation higher
than the set value in F1-10 continues for longer than the time set in F1-11. After a speed deviation is detected,
the Inverter stops according to the setting in F1-04.
îš„Detecting a Wrong Rotation Direction DV3 (F1-18, Closed Loop Vector for PM only)
A DV3 fault indicates a wrong motor rotation direction. It is detected if
• the speed deviation is higher than 30% and
• the internal torque reference value and the acceleration have opposite signs
The fault is detected after the time F1-18 x 5 ms.
Parameter
No.
Name
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
Open
Loop
Vector
Closed
Loop
Vector
Closed
Loop
Vector
(PM)
F1-02 Operation selection at PG open circuit (PGO) 1 No - - A A
F1-03 Operation selection at overspeed (OS) 1 No - - A A
F1-04 Operation selection at deviation (DEV) 3 No - - A A
F1-08 Overspeed detection level 115% No - - A A
F1-09 Overspeed detection time 0.0 sec. No - - A A
F1-10 Speed deviation detection level 10% No - - A A
F1-11 Speed deviation detection time 0.5 sec. No - - A A
F1-14 PG open-circuit detection delay time 2.0 s No - - A A
F1-18 DV3 detection selection 1 No - - - A
F1-19 DV4 detection selection 1024 No - - - A
F1-21 Absolute encoder resolution 2 No - - - A
F1-22 Magnet position offset 60° No - - - A
F1-24 PGO detection Level at stop 20% No - - - A
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