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4-2 Start-up MN894
Quick Set-Up 1. Check continuity of the motor wiring and check for phase to phase and
phase to ground short circuits.
2. Connect the control wiring for your application.
(Refer to section 2 for wire size and torque specifications).
3. For MB#−XXX models, verify the control transformer is set for the line voltage.
For MA#−XXX models, verify proper voltage jumper selection on LCM models.
4. Calibrate S1. Refer to Appendix A for switch settings.
Voltage Ramp Starting - (Fans or lightly loaded motors)
5. Set for ramp up with ramp down as follows:
S2-1 = OFF Ramp down disable
S2-2 = OFF Current monitor
S2-3 = OFF Over current shut down
S2-4 = OFF Tachometer enable
S2-5 = OFF Current limit enable
S2-6 = OFF Bypass contactor
Set RU, TU, PT and PF fully CCW.
Set RD and RT at mid point.
6. Set for ramp up with no ramp down as follows:
S2-1 = ON Ramp down disable
S2-2 = OFF Current monitor
S2-3 = OFF Over current shut down
S2-4 = OFF Tachometer enable
S2-5 = OFF Current limit enable
S2-6 = OFF Bypass contactor
Set RU, TU, PT and PF fully CCW.
Note: If the control OC trips, use Current Ramp Starting.
7. Continue with step 14.
Current Ramp Starting - (High inertial loads)
8. Set for ramp up with ramp down as follows:
S2-1 = OFF Ramp down disable
S2-2 = OFF Current monitor
S2-3 = OFF Over current shut down
S2-4 = OFF Tachometer enable
S2-5 = ON Current limit enable
S2-6 = OFF Bypass contactor
Set RU, TU, PT and PF fully CCW.
Set RD and RT at mid point.
9. Set for ramp up with no ramp down as follows:
S2-1 = ON Ramp down disable
S2-2 = OFF Current monitor
S2-3 = OFF Over current shut down
S2-4 = OFF Tachometer enable
S2-5 = ON Current limit enable
S2-6 = OFF Bypass contactor
Set TU, PT, RD, TD and PF fully CCW.
Set RU fully CW.
Set CL to midpoint.
10. Continue with step 14.