Mag-Gard^™, PowerPacT, and TeSys Motor Circuit Protector and Circuit Breaker Settings

The adjustable magnetic trip setting is factory-set at Lo for Mag-Gard Motor Circuit Protectors. For PowerPacT H- and J-frame, and TeSys BV4 Motor Circuit Protectors, where applicable, the Full Load Amp Setting (FLA) is factory set to the lowest setting. The instantaneous trip setting (Im) is factory set to the Auto 1 or the lowest instantaneous trip setting. For PowerPacT P-frame Motor Circuit Protectors (ET1.0M electronic trip unit), the adjustable instantaneous trip setting is factory set to its lowest position. These settings may have to be adjusted for proper motor start-up. For Mag-Gard, PowerPacT, and TeSys BV4 Motor Circuit Protectors, refer to the magnetic trip set-point limits outlined in the applicable national installation codes. For PowerPacT H- and J-frame Motor Circuit Protectors, refer also to instruction bulletin 48940–260–01, Motor Circuit Protector (MCP) Settings For PowerPact H- and J-frame Motor Circuit Protectors .

DANGER

Hazard of Electric Shock, Explosion, or Arc Flash Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS, CSA Z462, or local equivalent. This equipment must only be installed and serviced by qualified electrical personnel. Turn off all power supplying this equipment before working on or inside equipment. Always use a properly rated voltage sensing device to confirm power is off. Replace all devices, doors, and covers before turning on power to this equipment. Failure to follow these instructions will result in death or serious injury.

To access the MagGard trip or TeSys BV4 adjustment dial:

1. 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.

2. Place the unit handle in the OFF position and open the door.

3. While pushing the door interlock lever forward, trip the circuit breaker by pressing the test button (see Mag-Gard and TeSys BV4 Magnetic Trip Adjustment). The disconnect handle automatically moves up, allowing access to the adjustment dial.

Mag-Gard and TeSys BV4 Magnetic Trip Adjustment

After obtaining the motor full load current from the motor nameplate, select an adjustable trip setpoint to test start the motor. Further adjustments may be required because of motor load characteristics. Refer to applicable national installation codes for permissible setpoints.

After adjusting the trip setting, reset the circuit breaker by moving the disconnect handle to the ON position and then to the OFF position.

To access the PowerPacT H- and J-frame Full Load Amps (FLA) and Instantaneous Trip setting (Im) dials:

PowerPacT H- and J-frame Magnetic Trip Adjustment

1. 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.

2. Place the unit handle in the OFF position and open the door.

3. To set the FLA and Im dials, refer to instruction bulletin 48940–260–01, Motor Circuit Protector (MCP) Settings For PowerPact H- and J-frame Motor Circuit Protectors.

To access the PowerPacT L-frame trip adjustment dial (Isd):

1. 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.

2. Place the unit handle in the OFF position and open the door.

3. Set the overcurrent trip setting by adjusting the switch labeled "Isd" as shown in PowerPacT L-frame Instantaneous Trip AdjustmentFigure 130. The dial is labeled in amperes. Refer to instruction bulletin 48940–310-01, MicroLogic™ 0, 1, 2, and 3 Trip Units—User Guide, for more information on trip settings.

PowerPacT L-frame Instantaneous Trip Adjustment

After obtaining the motor full load current from the motor nameplate, select an adjustable trip set-point to test start the motor. Further adjustments may be required because of motor load characteristics. Refer to applicable national installation codes for permissible set-points.

To access the PowerPacT P-frame Instantaneous Trip setting (Im) dial:

1. 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.

2. Place the unit handle in the OFF position and open the door.

3. Adjust as follows:

   1. For 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

      

   2. For P-frame MCPs with other Micrologic electronic trip units, see instruction bulletin 48049-148-05, PowerPact™ P-Frame and NS630b–NS1600 Circuit Breakers

After obtaining the motor full load current from the motor nameplate, select an adjustable trip set-point to test start the motor. Further adjustments may be required because of motor load characteristics. Refer to applicable national installation codes for permissible set-points.

The following describes procedures for adjusting the trip units in PowerPacT M- and P-frame circuit breakers that have flange-mounted operator mechanisms. Circuit breaker instantaneous trip setting is factory-set to the minimum setting. It may need to be adjusted to permit motor starting in some cases. Circuit breaker trip setting dials are located behind the bail arm of the circuit breaker operator mechanism.

1. 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.

2. Place the unit handle in the OFF position and open the door.

3. Insert a small, flat-head screwdriver through the opening in the mechanism bail arm and into the slot of the adjustment dial being changed (see Detailed View of Mechanism Bail Arm and Typical Adjustment Dials). Turn the adjustment dial to the desired position. If one or more dials cannot be accessed through the bail arm opening, go to step 4. Otherwise, skip to step 9.

   NOTE: For adjustable amperage M- or P-Frame circuit breakers, the amperage dial (or Ir long time) is factory-set to the required value associated with the horsepower/voltage application. Do not change this setting. If the dial setting appears to be incorrect, consult the order drawings to verify the correct required setting and, if necessary, adjust the setting to match the drawing value.

   Detailed View of Mechanism Bail Arm and Typical Adjustment Dials

   

   DANGER
   HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH To avoid the possibility of a short circuit, do not drop screws into components below the bail arm assembly. Failure to follow these instructions will result in death or serious injury.

4. Disassemble the bail arm by removing the four 1/4-20 x 3/8 in. mounting screws (see Bail Arm Disassembly). Retain the screws for re-assembly. Do not attempt to remove or loosen the four 1/4-20 x 1/2 in. toggle plates adjustment screws.

   Bail Arm Disassembly

   

   A	Bail arm mounting screws
   B	Toggle plates adjustment screws

   Refer to Circuit Breaker Trip Unit Adjustment for the following steps.

5. If the circuit breaker trip unit is provided with a door, use the screwdriver to open it (A).

6. Insert the screwdriver into the slot of the adjustment dial being changed. Turn the adjustment dial to the desired position. Repeat as necessary for other dials (B).

7. Close the trip unit door. Use a MicroLogic Trip Unit Tamper Evident Seal, (MICROTUSEAL, not provided), if necessary, to provide tamper evidence (C).

   Circuit Breaker Trip Unit Adjustment

8. After making the necessary adjustments, re-assemble the bail arm using the four screws removed in step 4. Torque each screw to 70 lb-in.

9. Close and latch the unit door.

10. Test the operation of the circuit breaker mechanism by closing and opening the circuit breaker using the operator handle.

11. If the circuit breaker mechanism does not operate properly, contact your local Schneider Electric representative.