How smart motor controls can maximize resilience and uptime
TeSys Giga contactors can be supplied by an alternating current (AC) or direct current (DC) control voltage and have built-in surge suppressors. There are two versions of contactors, standard and advanced. Standard contactors are designed for general usage. Examples include: ■ LC1G1154LSEN, 4P for AC-1 loads. Rated for 250 A with a 200- 500 V AC/DC wide-band coil ■ LC1G225KUEN, 3P for AC-3 loads. Rated for 225 A with a 100- 250 V AC/DC coil Advanced TeSys Giga contactors have additional features like a greater selection of coil voltages, lower coil power consumption, a programmable logic controller (PLC) input, and a cable design that enables maintenance without removing cables or busbar connections. Advanced models are also compatible with the optional Remote Wear Diagnosis (RWD) module discussed in the next section. Examples of advanced contactors include: ■ LC1G115BEEA, 3P for AC-3 loads. Rated for 115 A with a 24-48 V AC/DC coil ■ LC1G800EHEA, 3P for AC-3 loads. Rated for 800 A with a 48- 130 V AC/DC coil
2. Determine the SCCR of each branch circuit. Based on the values of the components in the circuit. 3.Determine the SCCR of the complete control panel. Based on the values of the circuits. TeSys giga contactors TeSys Giga contactors are available with ratings from 115 to 900 amps (A) in both 3-pole (3P) and 4-pole (4P) configurations. They have SCCRs rated up to 100 kiloamps (kA) and 480 volts (V), with the specifics for various protection devices and ratings listed in a table on the side of the contactor. Additionally, the 4P contactors show the AC-3 and HP motor ratings. These contactors are available for two load categories: ■ AC-1 – This applies to AC loads where the power factor is more than 0.95. These are primarily non-inductive or slightly inductive loads, such as resistive loads. Breaking the arc results in minimal arcing and contact wear. ■ AC-3 – This applies to squirrel cage motors with breaking during normal running of the motor. On closing, there’s an inrush current of up to seven times the rated full load current of the motor. On opening, the contactor breaks the motor's rated full load current.
All TeSys Giga contactors include a Diagnosis LED on the front panel for quickly evaluating fault conditions (Figure 4).
Figure 2: Typical TeSys Giga contactor showing the Diagnosis LED in the top center of the unit. (Image source: DigiKey)
TeSys Giga contactors have several integrated diagnostic functions to improve reliability and support preventative maintenance, including:
Contact Wear Diagnosis and RWD
Contacts experience wear every time they break the current in the power circuit. A contact failure results in loss of motor control. The
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