BABBITT LS8500, Owner'S Manual

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www.babbittinternational.com Reference Manual
2021
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4.3 Time Delay
The purpose of the time delay is to allow the pump to prime itself or ignore voids in the process for a
preset period of time. The time delay is adjustable between 1/8 second to 2 hours. If no time delay is
required, turn the time adjustment pot completely CCW and set S1 down, S2 up. The potentiometer has
20 turns and freewheels at the end of its travel without damage. You may hear “clicks” at the end of
travel.
4.3 Setting the Time Delay
1) Setting the timing mode, either on delay or off delay, is done by positioning S3 and S4 as shown in the
chart below.
NOTE: S3 and S4 also select fail safe high level (FSH) or fail safe low level (FSL).
2) Select the timing range using S1 and S2 as shown on the chart below.
3) Adjust the time adjustment potentiometer clockwise to increase time or CWW to decrease until the
exact time delay is reached. The test switch may be depressed to start the timing when checking timing
sequence.
NOTE: For long timing ranges you can set the timer for a shorter range, then
change the range switches (S1 and S2) to increase the time. For example, the desired
time delay is 15 minutes. This is equal to 900 seconds. By setting S1 down and S2 up
and adjusting the timer to approximately 28 seconds, the ratio on this range is 1. To
increase this range by 32, move S1 up and S2 up. 32x28 seconds equals approximately
15 minutes.
4.5 Fail Safe Selection
The failsafe feature provides a “false alarm” in case of power outage or major component failures. When
properly selected, the failsafe feature can protect equipment or alert you of a unit failure. Fail Safe High
(FSH) means that the relay is energized when NO PRODUCT is touching the sensing element. The green
led indicates relay status and is on when the relay is energized. When product comes into contact with the
sensing element, the relay is de-energized. Fail Safe Low (FSL) means that the relay is energized when
PRODUCT IS touching the sensing element.
NOTE: Due to the wide variety of applications and possible control or alarm functions, the proper fail
safe selection will depend on your circumstances. Please call your distributor or the factory if
you need assistance.