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RELAY OVERVIEW
This complete microprocessor based pump controller is designed to assure
equal run time for each pump with a lead/lag/alternating control scheme.
LED indicators show the status of the unit's five intrinsically safe
control switch inputs, one alarm and two load outputs. H-O-A
switches, a lead select switch and a test/clear button are provided for
manual control. The ARM series reduces the number of components
required for this application by combining many functions into one unit.
UL913 Intrinsically Safe: Control
Switch inputs are low voltage/low current and are electronically
isolated from the control voltage and load alarm contacts.
Lead Select Switch: Disables the
automatic sequencing function and allows loads to be locked into the 2-1
or 1-2 sequence.
Control Switch Fault Detection:
Unit detects open and shorted control switch failures.
Test/Clear Switch: Verifies
function and resets the control switch fault detection algorithm.
Alarm Output: Alarm contacts close
when a control switch fails or the system's capacity is exceeded.
Inrush Current Delay: Reduces line
sags by preventing both loads from energizing simultaneously. |
