dooch Q-Drive NQ-0075-S, User Manual, Page: 70 / 80

[CHAPTER 7 CAUSE OF FAULT AND REACTION]
7-3 | DOOCHPUMP
Er-03 (Low Pressure Alarm-tLP)
Cause
ㆍ
It is an alarm generated when the current operation pressure is maintained under the low
pressure alarm level. It starts automatically after Automatic Restart Time (dr-38) from trip.
However, if it repeats more than No. of Automatic Restart after Trip (dr-37), it does not restart
anymore to protect motor and drive.
Reaction
ㆍ
Check if the water tank (water reservoir) is filled with water.
ㆍ
Check if the air enters into the pump.
ㆍ
Check if there is any water by opening air cock of pump.
ㆍ
After releasing error by pressing key, press key to start the pump.
Related Function Function Name Ref. Page
Pr-71 Low Pressure Alarm Level 6-12
Pr-73 Low Pressure Alarm Time 6-13
dr-37 No. of Automatic Restart after Trip 6-20
dr-38 Waiting Time for Automatic Restart after Trip 6-20
Er-04 (Low water Level Alarm-tUL )
Cause
ㆍ
It is an alarm generated to prevent the mechanical seal from being damaged due to running of
the pump when there is no water on the suction side. It is generated when the low level
sensor (electrode) does not detect the water. In case of not using the low water level sensor,
the software generates the alarm when the current pressure is maintained under the low
pressure alarm level (Pr-75)and operation continues for low pressure trip time(Pr-74). In case
of using the low water level sensor (electrode), when there is water, the alarm will be
automatically released and the drive will be automatically operate
Reaction
ㆍ
Check if the water tank (water reservoir) is filled with water.
ㆍ
Check if there is any water by opening air cock of pump.
ㆍ
After releasing error by pressing key, press key to start the pump
Air Cock
Air Cock