dooch Q-Drive NQ-0075-S, User Manual, Page: 72 / 80

[CHAPTER 7 CAUSE OF FAULT AND REACTION]
7-5 | DOOCHPUMP
Er-07 (H/W Over Current Restriction Trip-SOC)
Cause
ㆍ
In case acceleration/deceleration time is excessively short comparing to load inertia
ㆍ
It cuts off the motor output to control the current when the drive restarts on motor Free-run
state or over current is generated due to sudden overload.
Reaction
ㆍ
Adjust the acceleration/deceleration time.
ㆍ
Check if the drive capacity is suitable for motor capacity.
ㆍ
Start the pump after the motor stopped.
ㆍ
If load is large on starting, adjust torque boost amount (dr-41).
If the same alarm occurs, please contact A/S center.
Related Function Function Name Ref. Page
6-16 Motor Capacity dr-10
dr-21 Motor Stopping Method
Rising Time dr-22
Falling Time dr-23
6-18
dr-41 Torque Boost Amount 6-21
Er-08 (Motor Overheat-tMOH)
Cause
ㆍ
Occurred by motor overheat.
ㆍ
Occurred when load is larger than rated drive capacity.
ㆍ
In case drive capacity is not properly selected
ㆍ
Operation under low speed for long time
Reaction
ㆍ
Check if load capacity is suitable for rated drive capacity.
ㆍ
Reduce load or No. of operations.
Related Function Function Name Ref. Page
6-16 Motor Capacity dr-10
dr-35 Motor
Overheat Selection 6-20
Er-09 (Overheat Trip-tOH)
Cause
ㆍ
It generates an alarm and stops operation to prevent IGBT from being damaged in case of
cooling fan interruption due to cooling fan fault or foreign materials and high ambient
temperature.
Reaction
ㆍ
Check if there is any cooling fan fault and insertion of foreign materials.
ㆍ
Check the ambient temperature and maintain it under 40 if it is too high
℃