Motor Circuit Protector (MCP) Settings
The National Electrical Code® (NEC®) and Canadian Electrical Code (CEC) require that magnetic starters, used in combination with adjustable magnetic triponly circuit breakers, have an overload relay in each conductor. TeSys or PowerPacT™ MCPs are the standard motor circuit protectors used in Model 6 MCCs.
Adjusting TeSys or PowerPacT Magnetic Trip Setting
The adjustable magnetic trip setting for all MCPs is factory-set at the lowest trip settting. The trip settings of each MCP will have to be verified for the motor load and adjusted for proper motor start-up.
 DANGER |
|---|
|
Hazard of Electric Shock, Explosion, or Arc Flash
Failure to follow these instructions will result in death or serious injury.
|
Access the MCP Trip Adjustment
-
Obtaining the motor full load currents from the motor nameplates, select adjustable trip set-points to test start the motors. Further adjustments may be required because of motor load characteristics. Refer to applicable national installation codes for permissible set-points.
-
Turn off all power supplying this equipment before working on or inside the equipment, and follow lockout/tagout procedures. Always use a properly rated voltage sensing device to confirm the power is off.
-
Place the unit handle in the OFF position and open the door.
-
Use the procedures on the following pages to adjust MCPs.
TeSys B-frame Adjustment Dials
-
While pushing the door interlock lever forward, trip the circuit breaker by pressing the yellow test button (see TeSys B-frame Adjustment Dials). The disconnect handle will automatically move up, allowing access to the adjustment dial.
TeSys B-frame Adjustment Dials
_DD00736840.png)
-
After adjusting the trip setting, reset the circuit breaker by moving the disconnect handle to the ON position and then to the OFF position.
PowerPacT H- and J-frame Adjustment Dials
Set the FLA and Im dials (see PowerPacT H- and J-frame Magnetic Trip Adjustment). Refer to instruction bulletin 48940-260-01, Motor Circuit Protector (MCP) Settings for PowerPacT H- and J-frame Motor Circuit Protectors for more information.
PowerPacT H- and J-frame Magnetic Trip Adjustment
PowerPacT L-frame Adjustment Dials
Set the trip by adjusting the dial labeled "Isd" as shown in PowerPacT L-frame Adjustment Dials. The dial is labeled in amperes. Refer to the subsection titled MicroLogic™ 1.3M Electronic Trip Unit Settings in Section 3–Motor-Feeder Applications of instruction bulletin 48940-310-01, MicroLogic 0, 1, 2, and 3 Trip Units User Guide.
PowerPacT L-frame Adjustment Dials
PowerPacT P-frame Adjustment Dials
Make adjustments to P-frame MCPs as follows:
-
For P-frame MCPs with MicroLogic ET1.0I and ET1.0M electronic trip units, adjust instantaneous trip (Ii) by adjusting switch A (see PowerPacT P-frame Instantaneous Trip Adjustment). Switch settings are multiples of the frame rating.
PowerPacT P-frame Instantaneous Trip Adjustment
-
For P-frame MCPs with other MicroLogic electronic trip units, see instruction bulletin 48049-148-05, PowerPacT P-Frame and NS630b–NS1600 Circuit Breakers.