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Model CD-3R REDUNDANT PUMP CONTROL - using a single float
This specification covers a complete automatic redundant pump control and alarm system responding to the ________________ level as shown on the plan drawings.
The redundant pump controller shall be used with a single high-level float switch mounted above the normal operating range of the primary control system. The controller shall incorporate a front panel LCD (liquid crystal display) that clearly indicates the active inputs/outputs and provides an operator interface for viewing and changing the integral timers. When the high-level float input contact closes, the controller shall energize a lead pump output. If the float switch remains closed, the controller’s internal 1st lag on-delay timer shall expire and call for the 1st lag pump. If the float switch remains closed, the controller’s internal 2nd lag on-delay timer shall expire and call for the 2nd lag pump. The second and third pump start delay shall be adjustable from 0-99.9 seconds. The pump(s) shall continue to operate for a field-adjustable time period following the opening of the single abnormal level float switch input. The OFF delay timer shall be keypad programmable from 0-10.00 minutes. At the end of the pumping sequence, the controller’s alternator shall advance to the next pumping sequence. All timing values shall be stored in permanent memory. The controller shall have provision to place the alternator in a fixed sequence. The controller shall contain four relay outputs. Three outputs shall be used for pump control and shall be wired in tandem with the primary control system’s control outputs. The controller shall contain a selectable abnormal level output. The abnormal level output shall be selectable to provide either an abnormal level ‘alarm’ or ‘monitor’ function. The controller shall accept an external alarm silence/acknowledge input. The abnormal level output shall be reset by activating the silence/acknowledge input or shall automatically silence and reset at the end of each pumping cycle. The controller shall be UL 508 Listed. The controller shall be a CONTEGRA CD-3R.