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9 STARTER TYPES
9.6 INVERTER STARTER
When the RUN contact closes the inverter ramps up the motor to the programmed speed. When the RUN con-
tact opens, the inverter ramps down the motor to a stop.
To program the MM3 for inverter starter, set:
S1 CONFIGURATION\STARTER\STARTER TYPE: INVERTER
S1 CONFIGURATION\STARTER\RAMP UP TIME: 1 to 125 sec.
S1 CONFIGURATION\STARTER\RAMP DOWN TIME: 1 to 125 sec.
The RAMP UP TIME and RAMP DOWN TIME setpoints appear when the STARTER TYPE is selected as INVERTER. See
the next section for details on functionality.
START sequence:
1. Start command is received by the MM3. (serial, switch input or faceplate).
2. Close and maintain Contactor A output relay. - provide power to the inverter
3. Wait for one second.
4. Close and maintain Contactor B output relay. - signal the inverter to start the motor.
5. Wait for the RAMP UP TIME for Contactor B Status N.O. to close.
STOP/TRIP sequence:
1. Stop command is received or a trip occurs. (serial, switch input or faceplate)
2. Open contactor B output relay.
3. Wait for the RAMP DOWN TIME for Contactor B Status N.O. to open.
4. When Contactor B Status N.O. reads open, open Contactor A output relay.
If feedback is not received from the 1M contact to the Contactor A Status N.O. input within 1 second of closing
Contactor A output relay, an OPEN CONTROL CIRCUIT alarm occurs. This causes the Contactor A and B out-
put relays to open.
If Contactor B Status N.O. does not receive feedback from the up to speed contact on the inverter within the
RAMP UP TIME setpoint during a start, a DRIVE FAILED TO START alarm will be generated. If Contactor B
Status N.O. feedback remains at the MM3 after the RAMP DOWN TIME has expired during a stop, a DRIVE
FAILED TO STOP alarm will be generated.
If feedback remains at Contactor A Status N.O. input more than one second after opening the Contactor A out-
put relay, a WELDED CONTACTOR alarm will occur.
GE Power Management
Figure 9–13: ELEMENTARY INVERTER STARTER
MM3 Motor Manager 3
9.6 INVERTER STARTER
9.6.1 DESCRIPTION
9.6.2 MM3 SEQUENCES
9-17
9
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