Transfer Switch

The Hubbell Transfer Control Module, LX-301, controls transfer to the emergency source and retransfer to the normal source. The LX-440 non-automatic transfer switch does not come with a Control Module. A selector switch initiates transfer and retransfer.

Automatic Operation

Transfer to Emergency Source

The Control Module monitors the normal source phase voltage for acceptable limits of drop-out and pick-up. A NORMAL OVERRIDE ON MOMENTARY OUTAGE time delay is provided to override voltage dips causing nuisance starting of the engine generator set. If the normal source voltage is restored above the pick-up setting within the time delay period, the delay timer is reset.

If the NORMAL OVERRIDE ON MOMENTARY OUTAGE time delay expires before the normal source voltage is restored, the normal source electronic control initiates engine starting of the generator set and/or activates the emergency source electronic control. The engine control relay is a 12 VDC latching relay on the Control Module. The customer connections for the engine start contacts are on PTB1 located on the left side of the transfer switch mounting panel. Refer to the Field Connections Wiring Diagram posted on the inside of the cabinet door and in the drawing packet for customer connections.

The emergency source electronic control monitors the emergency source for the acceptable voltage and frequency pick-up levels. When both the voltage and frequency of the emergency source are verified, 24 VDC from the Control Module energizes the TCR (Transfer Control Relay). The normally open contacts of the TCR close to power the transfer switch switching mechanism via emergency transformer XFMR2. After the emergency source contacts close, auxiliary contacts TSEb1 open to disconnect power to the switching mechanism.

Transfer switches with the NEUTRAL POSITION TIME DELAY, stop in the neutral position. After the adjustable time delay expires, Q1 on the TCR board turns on to energize the TR relay. The TR relay contacts close to re-connect power to the switching mechanism to complete the transfer.

An EMERGENCY OVERRIDE ON MOMENTARY OUTAGE time delay is provided to override momentary voltage dips preventing the transfer switch from retransferring to the normal source. If the emergency source voltage is restored above the pick-up setting within the delay period, the delay timer is reset.

Retransfer to Normal Source

When the Control Module detects that the normal source voltage rises above the pick-up settings, the timing sequence starts for retransfer to the normal source. The RETRANSFER TO THE NORMAL time delay starts to allow the normal source to stabilize before retransfer. If the normal source does not meet pick-up requirements, the delay timer is reset.

At the end of this delay, the TCR is de-energized. The normally closed contacts of the TCR close. The switching mechanism is then powered by 120 V from the normal transformer, XFMR1, through the TCR relay contacts. After the normal source contacts close , auxiliary contact TSNb1 opens to disconnect power to the switching mechanism.

Transfer switches with the NEUTRAL POSITION TIME DELAY, stop in the neutral position. After the adjustable time delay expires, the TR contacts close to complete transfer.

Page 6 of 16 Pages

Page 5 Page 7
Page 6
Image 6
Hubbell LX-440, LX-450 instruction manual Automatic Operation, Transfer to Emergency Source, Retransfer to Normal Source
Page 5 Page 7

LX-450, LX-440 specifications

The Hubbell LX-440 and LX-450 are cutting-edge LED lighting solutions designed to meet the demands of various commercial and industrial applications. These products stand out for their exceptional energy efficiency, durability, and advanced technology, making them ideal for environments ranging from manufacturing facilities to retail spaces.

One of the primary features of the LX-440 and LX-450 is their robust construction. Built to withstand harsh conditions, the fixtures are engineered with high-quality materials that ensure longevity and reduced maintenance costs. The body of both models is designed to resist corrosion, making them suitable for use in environments exposed to moisture and chemicals. This makes the LX series particularly appealing for industries such as food processing, pharmaceuticals, and chemical manufacturing.

In terms of technology, the LX-440 and LX-450 utilize state-of-the-art LED technology to provide high lumen output with minimal energy consumption. This translates to substantial savings on energy bills and a reduced carbon footprint. With options for various color temperatures, users can select the lighting that best enhances visibility and comfort in their specific environments. These fixtures also boast an impressive lifespan of up to 100,000 hours, significantly reducing the need for frequent replacements.

Another significant characteristic of these models is their versatile installation options. The LX-440 and LX-450 can be easily mounted in a variety of settings, including pendant, surface, or chain mounting. This flexibility allows for customized layouts that can adapt to changing needs or configurations of the space. Furthermore, they feature a sleek and unobtrusive design that blends well with any decor, making them suitable for both industrial and commercial applications.

The LX series also includes advanced features such as integrated sensors for occupancy and daylight harvesting, which further enhance energy savings by ensuring that lights are on only when needed. These intelligent lighting solutions respond to their environment, adjusting brightness levels automatically to maintain optimal lighting conditions while minimizing energy use.

In summary, the Hubbell LX-440 and LX-450 represent the pinnacle of modern lighting technology. With their durable construction, advanced LED efficiency, customizable installation options, and smart features, these fixtures are ideal choices for businesses looking to improve their lighting solutions while achieving significant energy savings.
Top Page Image Contents