MAGNETIC MOTOR STARTERS
Duplex Pump Controllers
Sprecher + Schuh duplex pump control panels are specifically designed to meet multi-starter combination requirements as defined in demanding outdoor environmental conditions.
Duplex pump controllers assembled in our custom controls panel shop are typically designed for two specific requirements: duplexing and alternation.
Duplexing provides capacity for above normal demand or system peaking by allowing both motors to run simultaneously. It also provides standby capacity if one unit fails. Typically multiple pressure or float switches are required to provide electrical signals to the controller.
Alternation provides for equal wear on the two machines being controlled by reversing the lead and lag role of the specific motors. Alternation occurs at any time the two motors come to rest.
This catalog introduces a new line of Duplex Pump Controllers from Sprecher + Schuh with through-thedoor operators and rugged Type 3R rain-proof metal or Type 4X non-metallic enclosures.
There are three new models of Duplex Controllers:
- Thermal-magnetic circuit breakers (MCCB) instead of a motor circuit protector (MCP) to comply with new short-circuit requirements from UL and NEC.
- L11 heavy duty fusible or non-fusible disconnect switches providing improved short-circuit protection when used with J fuses.
- Self-protected Combination Controllers (Type E) KTA7 models which offers superior fuseless shortcircuit protection.
Duplex pump panels feature our CA7, and CA6 line of contactors which are UL Listed and sized to match all the available HP sizes of motors. Alternately, we can provide NEMA Sized starters (CAN7 and CAN6) contactors which comply with all requirements by UL and are labeled with the applicable NEMA (00, 0, 1, 2, 3, 4 & 5) size in our pump panels.
Our MCCB models and the L10 models utilize the CEP7 solid state overload relay providing state-of-the-art overload and single-phase protection. See Section B in this catalog for a full description of these excellent motor protection relays.
Our KTA7 model utilizes the high speed current limiting capabilities providing short-circuit protection, branch-circuit disconnect, and overload protection in one compact device. These Type E panels are smaller than classic models and are therefore represent an economical solution to duplexing. See Section F in this catalog for application details for these Type E Combos.
Experience has shown that duplex pump panel often requires customization to accommodate unique components and unique control schematics diagrams. In the following pages you will find a catalog number structure showing standard models with standard options to help guide your selection. We have also provided a check list which can be utilized to request a similar model except customized to meet your application by contacting your Sprecher + Schuh representative.