Optimus Drive PDM20-2S1R5 Руководство по эксплуатации онлайн [38/54] 473996

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PDM20 Series

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Following methods can realize water shortage protection by default:

（1）The switch of water shortage protection is turned on（P0.25=1x）;

（2）The feedback pressure is less than allowed threshold value of water shortage

detection(feedback pressure<P0.26);

（3）The current running frequency is no less than water shortage protection

detection frequency（running frequency>=P0.27）;

（4）When （1）-（3） are satisfied, timing starts. When the time meeting the

condition exceeds abnormal pressure alarm delay time (delay time>P0.29), water

shortage fault will be reported. When either condition is not satisfied during timing,

timing recounts.

When water shortage fault is reported, after the time set by P0.30, the drive will reset.

By setting the next following parameters:

P0.32 Inflow detection pressure

0.0～P0.00

bar 1.0

P0.33 Inflow detection time

0.0～100.0

s 1.0

Use inflow detection pressure to reset water shortage faults directly.

Note: When judge water shortage according to pressure, because the working

condition of each drive is different such as range of load size, only setting the value

of P0.28 reasonably according to site conditions can it make correct judgment to

water shortage.

Setting method: Run the drive. When running frequency reaches maximum

frequency, turn off inlet and record the output current displayed on the drive. Divide

this current by P1.16 (the rated current of the motor) to get a percentage. Make the

value of P0.28 a little higher than 5-10 percentage points of the percentage. Too high

value of P0.28 will lead to false water shortage report in normal operation. Water

shortage protection will not work effectively with too low value of P0.28.