260
Causes and corrective actions
Operation panel
indication
E.ILF
FR-PU07
Input phase loss
Name
Input phase loss
Description
Drive unit trips when function valid setting (=1) is selected in
Pr. 872 Input phase loss protection selection
and one phase
of the three phase power input is lost.
It may function if phase-to-phase voltage of the three-phase power input becomes largely unbalanced.
When the setting of
Pr. 872 Input phase loss protection selection
is the initial value (
Pr. 872
="0"), this warning does not
occur.
Check point
Check for a break in the cable for the three-phase power supply input.
Check that phase-to-phase voltage of the three-phase power input is not largely unbalanced.
Corrective action
Wire the cables properly.
Repair a break portion in the cable.
Check the
Pr. 872 Input phase loss protection selection
setting.
Set
Pr. 872
= "0" (without input phase loss protection) when three-phase input voltage is largely unbalanced.
Operation panel
indication
E.OLT
FR-PU07
Stll Prev STP
Name
Stall prevention stop
Description
If the rotation speed has fallen to 15r/min by stall prevention operation and remains for 3s, a fault (E.OLT) appears
and the drive unit trips. OL appears while stall prevention is being activated.
E.OLT may not occur if stall prevention (OL) is activated during output phase loss.
Check point
Check the motor for use under overload.
Corrective action
Reduce the load weight. (Check the
Pr. 22 Stall prevention operation level
setting.)
Operation Panel
Indication
E.SOT
FR-PU07 Motor step out
Name
Loss of synchronism detection
Description
Stops the output when the operation is not synchronized.
Check point
Check that the PM motor is not driven overloaded.
Check if a start command is given to the drive unit while the PM motor is coasting.
Check if a motor other than the PM motor (S-PM geared motor) is driven.
Check that the operation is performed with a motor connected.
Corrective
action
Set the acceleration time longer.
Reduce the load.
Input a start command after the motor stops.
When driving a PM motor other than the S-PM geared motor, offline auto tuning must be performed. (
Check the connection of the PM motor. Set the PM motor test operation. (
.)
Operation panel
indication
E.BE
FR-PU07
Br. Cct. Fault
Name
Brake transistor alarm detection
Description
When a brake transistor alarm has occurred due to the large regenerative energy from the motor etc., the brake
transistor alarm is detected and the drive unit trips.
In this case, the drive unit must be powered OFF immediately.
Check point
Reduce the load inertia.
Check that the frequency of using the brake is proper.
Check that the brake resistor selected is correct.
Corrective action
Replace the drive unit.
Operation panel
indication
E.GF
FR-PU07
Ground Fault
Name
Output side earth (ground) fault overcurrent at start
Description
The drive unit trips if an earth (ground) fault overcurrent flows at start due to an earth (ground) fault that occurred on
the drive unit's output side (load side). Whether this protective function is used or not is set with
Pr. 249 Earth (ground)
fault detection at start
. When the setting of
Pr. 249 Earth (ground) fault detection at start
is the initial value
(Pr. 249 ="0")
,
this warning does not occur.
Check point
Check for a ground fault in the motor and connection cable.
Corrective action
Remedy the ground fault portion.
Summary of Contents for FR-D720-0.2K-G
Page 45: ...34 MEMO ...
Page 293: ...290 MEMO ...
