R-K Electronics, Inc.

Operation

Initial application of power to the input terminals will flash the indicating LEDs for 2 seconds, but no loads will be energized. When #1 input switch closes, the appropriate load will be energized after 5 seconds. As additional input switches close, additional loads will be energized. The sequencing of the QPB becomes apparent when pump or pressure requirements are satisified and input switches begin to open.

 

If all input switches are closed and all loads are energized, when #4 input switch opens, #1 load de-energizes. The QPB sequences the loads, distributing the running time, using a First On First Off (FOFO) basis. If two or more loads are to be turned on simultaneously, the QPB will activate one load, and wait 5 seconds before turning on the next load. This staggered starting prevents line surges.

 

Any of the loads can be taken out of service or future expansion loads can be disabled by turning off the appropriate Relay Select switch(s). The QPB will sequence the remaining loads, skipping the disabled load(s).

 

The Alarm contact will activate whenever an input switch closes out of sequence. If #2 Input switch closes, but #1 remains open (because of a failure), the Alarm contact will close and the QPB will operate two pumps as if #1 Input switch had closed. When the condition indicating a fault clears, the Alarm resets automatically.

 

With two Relay Select switches disabled, the QPB performs a true duplex alternating operation, even if two loads are activated each time.

 

(download pdf spec sheet at left for more operation details)

 

Specifications

Electrical

Line Voltage:

     24V AC/DC, ±10%

     115 or 230VAC, ±10%, 1Ø, 50/60Hz Inputs:

Normally Open (NO) contact or Solid State (NPN)

Power Up Delay: 5 Sec., Fixed

Input Delays: 5 Sec., Fixed

Output Ratings:

     10 Amps Total Unit Rating

     5 Amps @ 240VAC, per contact

     10 Amps @ 120VAC, per contact

     100,000 Full Load Electrical Cycles

     10,000,000 Mechanical Cycles

Output Delays: 5 Sec., Fixed Staggered start of multiple outputs

 

Physical

Mounting: Surface

Termination: Screw Terminals Removable (Plug-In)

Packaging: Dust Cover

Weight: 2 Lbs. Approx.

 

Ambient Temperatures

Operating: 0°C to 40°C

Storage: -30°C to 85°C