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ppbRAE 3000 User’s Guide

Adjusting The Pump Stall Threshold

If the gas inlet is blocked but the pump does not shut down, or the

pump shuts down too easily with a slight blockage, the pump stall

threshold value may be set too high or too low.

Use the following steps to adjust the pump stall threshold:

Pump High

In Diagnostic Mode, press the [MODE] key until “Pump High” is

displayed. The display shows the maximum, minimum, and stall

values for the pump at its high speed. Write down the “Max” reading.

Block the gas inlet and watch the pump current reading (labeled “I”)

increase. Write down its blocked reading. Note: If the pump current

reading does not increase significantly (less than 10 counts), then

there may be a leak in the gas inlet or the pump is weak or defective.

Add the two readings you wrote down. This is the average of the

maximum block count and the maximum idle count. Divide that

number by 2. Use the [Y/+] or [N/-] key to increase or decrease the

stall value to equal that number.

Press the [MODE] key to exit this display.

Pump Low

In Diagnostic Mode, press the [MODE] key until “Pump Low” is