EN
77
P0.29
Water shortage protection
detection time
0-200
s
60.0
P0.30
Automatic reset
delay of water shortage
protection
0~9999
If set to 0, then use pressure to automatically reset
the dry running protection.
min
15
The following methods can implement dry running protection by default:
1. The dry running protection switch is on (P0.25 = X);
2. The system pressure is lower than the permitted water shortage detection limit (feedback pressure < P0.26);
3. The current operating frequency is not lower than the frequency of the dry running protection detection
(operating frequency >= P0.27);
4. When conditions (1) - (3) are met, timing starts. When the conditions are met and the timing time exceeds the
delay time of the abnormal pressure alarm (delay time > P0.29), a water shortage fault will be generated. If
any of the conditions are not met during timing, timing will restart from the beginning.
When a water shortage fault is generated, then after the time set in P0.30, the device will be reset depending on the
following parameters
:
P0.32
Input pressure detection
0,0 - P0.00
bar
1.0
P0.33
Input pressure detection time
0,0
—100,0
s
20.0
Use the inlet detection pressure to directly reset the water shortage alarm.
Note
: When evaluating a water shortage by pressure, since the operating condition of each device varies, for example
by load range, then only setting P0.28 judiciously according to the site conditions can ensure a correct evaluation of the
water shortage.
Setting method
: Turn on the device. When the operating frequency reaches the maximum frequency value, turn off
the supply and record the displayed output current. Divide this current by P1.16 (motor rated current) to obtain a
percentage value. Set the P0.28 value slightly higher than 5-10 percentage points of the percentage value. Too high a
value of P0.28 will result in false generation of a water shortage alarm during normal operation. Conversely, with too
low a P0.28 value, the dry running protection will not be effective.
P0.34 Minimum voltage AI
0,00V to P0.35
0,01V
2.00
Used for the AI signal lower limit correction
P0.35 Minimum voltage AI
P0.34 to +10,00V
0,01V
10.00
Used for the AI signal upper limit
correction
If you find a deviation between the sensor's feedback pressure and the feedback pressure displayed on the device,
adjust the sensor by setting the above parameter.
Note: The current sensor range is 4~20 mA, the voltage sensor range is 0-10 V.
P0.36
Acceleration time 1
0,1
—100
s
2.0
P0.37
Deceleration time 1
0,1
—100
s
2.0
Pump motor acceleration/deceleration time setting.
P0.38
Parameter initialization
0
—2
0
When P0.38 is set to 1, the frequency convertor is reset to factory settings.
P0.39
Parameter locking function
0-1
0
If you do not want the parameters to be changed accidentally by incorrect manipulation after setting the parameters,
set P0.39 = 1. Then the parameters can only be displayed, they cannot be changed. Parameters can only be changed
when P0.39 is set to 0.
P0.40 Current error type
0
—29
Device error type 0 means that there is no fault. 1~29 refers to E001~E029. For more information, see the
troubleshooting chapter.
