LAB 9 10 11 - available to the motor and thus limits the...

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Mike Borton ELEX 2845 A00675324 SET 3D LAB 9 LAB 10 LAB 11
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LAB #9 Double Break Power Contacts: Double-Break contacts open the circuit in two places simultaneously. Double break contacts dissipate heat more readily, providing longer switch life and enabling the switch to handle higher voltages. Overload Relay: Provides protection against single phasing and unbalanced voltages. The Seal In Function: The seal in function works by creating a loop which is set off by an initial current triggering another trigger which starts the loop. Low Voltage Protection: This provides protection against low voltages. .
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I1 I2 I3 M1 1 M1 2 M1 Q1 3 M1 T1 T 4 M1 T1 Q2 5 I3 Q3 6 LAB#10 Sequence of operation for a PLC-based CLOSED TRANSITION (PRIMARY RESISTOR) Starter. 1. Power to the motor passes through a set of resistors, which drops some of the voltage
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Unformatted text preview: available to the motor and thus limits the starting current. 2. After the acceleration peroid, contacts close so as to shunt the resistors and allow full voltage to the motor. 3. Contractor “M” is the main power contractor, and is energised as soon as the starter is enabled. 4. Contractor “R” shunts the resistors. It is not enabled until after the acceleration period. 5. A time delay relay (TON – Time-to-on) provides this hold off. Depending on the inertia of the load, this can range from 3 – 30 seconds. I1 I2 I3 M1 1 M1 Q3 2 M1 T1 Q1 3 M1 T1 T 4 M1 T2 T 5 M1 T2 Q2 6 I3 Q4 7 I3 I7 Q5 8 9 LAB #11...
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LAB 9 10 11 - available to the motor and thus limits the...

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