6. Autostart Operation
When configured and equipped with transducer and back up switches, the panel will use the
transducer to determine the primary start and stop events. The switches are used to detected
transducer faults and when a fault is detected, the panel will automatically adjust to use the switches
to detect the start and stop events. The panel will alert to the fault but normal operation will continue
with the exception that the switches will be used instead of the faulty transducer.
For proper operation and fault detection, the switches must be configured such that the high-switch
open/closes at a level above the transducer’s high-level point and the low-switch open/closes at a
level below the transducer’s low-level point (see fluid pumping example diagram below).
Example: When pumping fluid, the setup should be similar to the following diagram. Typically, floats
function as an Open switch when not floating and Closed when floating.
Faults
Transducer Level Low-Level Switch High-Level Switch Result
Above Low-Level Point Open —
Transducer is within nor-
mal operating range but
value is incorrect (too high)
because low-level float
should be closed
Below High-Level Point — Closed
Transducer is within nor-
mal operating range but
value is incorrect (too low)
because high-level float is
closed
Out of Range (Low) — —
Transducer value is be-
low the normal operating
range (severe)
Out of Range (High) — —
Transducer value is be-
yond the normal operating
range (severe)
6.4.3 Configuring the Transducer
Page 26 LOFA document No. 463-3002-59 Page 26
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