Trane CTR0344E 150AMP Tripol Contactor. Star / Delta Contactor.
Trane 150AMP Tripol Contactor details;
- Trane Chiller 150AMP Tripol Contactor (Star / Delta)
- TeSys D Contacor: 3P(3 NA) – AC-3 – <= 440 V 150 A – 110 V AC
- Contactor Application: Motor control / Resistive load
- Sontrol Sircuit Voltage: 110 V AC 50/60 Hz
- Auxiliary Contact Composition: 1 NA + 1 NK
- Coil Technology: Built-in bidirectional peak limiting diode suppressor
- Rated Operational Current: 150 A (at <60 °C) at <= 440 V AC AC-3 for power circuit
- Control Circuit Type: AC -de 50/60 Hz
- Model Number: LC1D150F7
- Trane Part Number: CTR0344E
- Commonly Used on Trane RTAC, RTAD and RTAF Screw Chiller Models
- Replaces / Supersedes: CTR-344E
Chiller documentation for CTR0344E 150AMP Tripol Contactor can be downloaded from below links;
- Trane Chiller Model RTAC 150AMP Tripol Contactor (Product Catalog, Sales Brochure, IOM)
- Trane Chiller Model RTAD 150AMP Tripol Contactor (Product Catalog, Sales Brochure, IOM)
- Trane Chiller Model RTAF 150AMP Tripol Contactor (Product Catalog, Sales Brochure, IOM)
Star-Delta motor starter
Most induction motors are started directly on line, but when very large motors are started that way, they cause a disturbance of voltage on the supply lines due to large starting current surges. To limit the starting current surge, large induction motors are started at reduced voltage and then have full supply voltage reconnected when they run up to near rotated speed.
One of the methods used for reduction of starting voltage is Star Delta starting;
Working Principle of Star-Delta Starter
This is the reduced voltage starting method. Voltage reduction during star-delta starting is achieved by physically reconfiguring the motor windings as illustrated in the figure below. During starting the motor windings are connected in star configuration and this reduces the voltage across each winding 3. This also reduces the torque by a factor of three.
After a period of time the winding are reconfigured as delta and the motor runs normally. Star/Delta starters are probably the most common reduced voltage starters. They are used in an attempt to reduce the start current applied to the motor during start as a means of reducing the disturbances and interference on the electrical supply.
The Star/Delta starter is manufactured from three contactors, a timer and a thermal overload. The contactors are smaller than the single contactor used in a Direct on Line starter as they are controlling winding currents only. The currents through the winding are 1/root 3 (58%) of the current in the line.
There are two contactors that are close during run, often referred to as the main contractor and the delta contactor. These are AC3 rated at 58% of the current rating of the motor. The third contactor is the star contactor and that only carries star current while the motor is connected in star.
The current in star is one third of the current in delta, so this contactor can be AC3 rated at one third (33%) of the motor rating.