150-A24NCD Allen Bradley

20 HP, Serial SMC Plus

 

The SMC-2™ Controller is a compact, multi-functional, versatile solidstate controller used in starting standard three-phase squirrel-cage induction motors. Three standard modes of operation are available within a single controller:

•          Soft Start
•          Current Limit Start
•          Full Voltage Start
•          Optional Soft Stop (Requires Interface Module)

The SMC-2™ Controller is available in eight sizes: 5, 9, 16, 24, 35, 54, 68, and 97 A. It is offered in three voltage ranges: 200…230V, 380…460V, and 500…575V, 50/60 Hz. The SMC-2™ Controller can be used in two configurations: as a series controller and as a motor controller with an interface option

---

Error codes

 

 

 

 

Power Loss

Power loss indicates that an input power phase is not present. The controller’s LCD display will identify the missing phase.

Note: If all three phases are absent when a start command is issued, the LCD will display “Starting” without motor rotation.

 

Line Fault ¬

Line fault with the affected phase displayed identifies three possible pre-start conditions.

• Phase loss

• Load loss

• Shorted SCR

Line fault with no phase indication is displayed when one of the following conditions occurs while the SMC Dialog Plus controller is in the run mode.

• Phase loss

• Load loss

• Shorted SCR

 

Overvoltage and Undervoltage Protection ¬

Overvoltage and undervoltage protection are user-defined as a percentage of the programmed line voltage. The SMC Dialog Plus controller continuously monitors the three supply phases. The calculated average is then compared to the programmed trip level.

 

Voltage Unbalance ¬

Voltage unbalance is detected by monitoring the three phase supply voltages. The formula used to calculate the percentage voltage unbalance is as follows:

Vu = 100 (Vd / Va)

Vu: Percent voltage unbalance

Vd: Maximum voltage deviation from the average voltage

Va: Average voltage

The controller will shut down when the calculated voltage unbalance reaches the user-programmed trip percentages.

 

Jam Detection ­

Jam detection operates when the SMC Dialog Plus controller status is “at speed.” The controller will shut down when the motor current reaches the user-defined trip level, which is based on a percentage of the programmed motor full load current rating.

 

Overload Protection

Overload protection is enabled in the Calibration group by programming the:

• Overload class

• Overload reset

• Motor FLC

• Service factor

Refer to Chapter 5 for more information on calibration.

 

Underload ­

Underload protection is available for undercurrent monitoring. The controller will shut down when the motor current drops below the trip level. This trip level, a percentage of the motor’s full load current rating, can be programmed.