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GE MM300 Instruction Manual Page 126

Motor management system low voltage motor protection and control.
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CONFIGURATION SETPOINTS
5–16
9.
Wait until contactor R closed status is received.
10. Open contactor 2S.
2S-1S start sequence:
1.
Start A command received by the MM300 (serial, digital input or faceplate).
2.
Wait for the time set in Pre-Contactor Time setpoint.
3.
Close and maintain contactor 2S. Reduced voltage is applied to the motor.
4.
Wait until contactor 2S closed status is received, then close and maintain contactor
1S.
5.
Wait for the time set in the Transfer Time setpoint.
6.
Open contactors 1S.
7.
Wait until contactor 1S open status is received.
8.
Close and maintain contactor R. Full voltage is applied to the motor.
9.
Wait until contactor R closed status is received.
10. Open contactor 2S.
Stop/trip sequence:
1.
Stop command received by the MM300 or a trip occurs.
2.
Open Contactor R.
3.
Open Contactors 1S and 2S if they are not already opened.
The following figures illustrate typical starter timing beginning from the stopped state.
Figure 5-13: Typical starter timing for autotransformer closed transition starter 1S-2S
Figure 5-14: Typical starter timing for autotransformer closed transition starter 2S-1S
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS

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