-
-
99
3.
If a fault is detected, the inverter output is shut off for the minimum baseblock time Pn-55.
While the inverter output is shut off, the fault is displayed on the digital display unit and the digital
operator.
4.
After the minimum baseblock time Pn-55, the fault is automatically reset, and the speed search
operation is performed from the output frequency at the fault occurrence.
5.
If the inverter output current is larger than the speed search operation level Pn-54 set value, the speed
search operation starts. The frequency in which the inverter output current is smaller than the speed
search operation level Pn-54 set value is judged to be the speed synchronized point, and
reacceleration/ redeceleration is performed up/down to the set frequency in the set accel/decel time.
6.
If the total number of faults exceeds the number of retry times Pn-47, automatic reset is not
performed and the inverter output is kept off. Then fault contact is output. (Fault contact is not output
during fault retry.)
Note:
1.
v/f during speed search
The v/f during speed search can be set as shown below by the Pn-56 set value so that a protective function
as OC will not occur during speed search. However, this setting is not needed under normal operation.
V/f during speed search=V/f at normal operation × Pn-56
2.
Minimum baseblock time
Do not provide excessively small value for the minimum baseblock time setting.
Otherwise, the inverter protective function may operate at speed search operation start.
(Refer to page 96.)
F
AULT CONTACT
IS OUTPUT.
NUMBER OF
REVOLUTIONS
OF MOTOR
FAULT CONTACT
OUTPUT FREQUENCY
FAULT DETECTION
○
1
○
2