GE MM3 Instruction Manual page 52

4.4 S3 PROCESS
• INTERLOCK COUNTER: This function provides a means to count switch closures when assigned to one
of the programmable switch inputs. When the switch input is put into the healthy position, the counter will
increment by one. The counter can be viewed on page A4: STATISTICS \ COUNTERS. The interlock counter
name and units can be programmed on page S3: PROCESS \ INTERLOCK NAMES. The digital input coming into
the MM3 must have an ON time of no less than 100 ms and an OFF time of no less than 100 ms. This
means that the MM3 can count up to 5 pulses per second = 5 Hz. The counter will count up to 65535 and
then roll over. The counter can be cleared on page S1: CONFIGURATION \ STATISTICS or via the serial commu-
nications link.
• AUX RELAY 1 INHIBIT: This function will override/inhibit AUX Relay 1. When healthy, it will prevent AUX
Relay 1 from turning ON, or turn OFF AUX Relay 1 after it is already ON.
• WYE-DELTA 1M CONTACT: This function is used as a status feedback input for the wye-delta closed tran-
sition starter type. See Section 9.11: WYE-DELTA CLOSED TRANSITION STARTER on page 9–31.
• WYE-DELTA 2S CONTACT: This function is used as a status feedback input for the wye-delta closed tran-
sition start type. See Section 9.11: WYE-DELTA CLOSED TRANSITION STARTER on page 9–31.
• U/V RESTART INHIBIT: This function disables the undervoltage restart feature when the switch is in the
healthy position and allows U/V restarts to take place when the switch is unhealthy. Note that the under-
4
voltage restart feature must be activated in S4: CONTROL for this interlock function to have any effect.
• AUTO TRANS 2S CONTACT: This function Is used as a status feedback input for the autotransformer
open/closed transition starter type. See Section 9.7: AUTOTRANSFORMER OPEN TRANSITION
STARTER on page 9–19 and 9.8: AUTOTRANSFORMER CLOSED TRANSITION STARTER on page 9–
23.
• STOP A: This function is used for end of travel applications. When an interlock configured for STOP A
opens the corresponding output relay will open. When the STOP A input is open the motor cannot be
started using start A commands or switch inputs.
• STOP B: This function is used for end of travel applications. When an interlock configured for STOP B
opens the corresponding output relay will open. When the STOP B input is open the motor cannot be
started using start B commands or switch inputs.
• REMOTE RESET: This function replaces the faceplate reset key. When configured the faceplate reset key
will not reset any trips. When other switch inputs are used to reset specific trips the remote reset switch
input will not reset those trips, i.e. Undercurrent Trip, Emergency Stop Trip, Lockout Trips.
• MOTOR SELECTOR A/B: This setting is used in conjunction with the Duty/Standby starter type. In the
Manual mode the state of this interlock determines which of the two motors is used for starting (Healthy =
Motor B). When A is selected only the contactor A output relay will respond to start commands. When B is
selected only the contactor B output relay will respond to start commands.
• DUTY SELECT MAN/AUTO: This setting is used in conjunction with the Duty/Standby starter type. This
input determines the mode of operation for the Duty/Standby starter type either Manual or Auto. In the
Auto mode the MM3 will alternatively start Motor A and Motor B. When the number of starts is an even
number Motor A will be started the next time a start command is issued. When the number of starts is odd
Motor B will be started the next time a start command is issued. In the event of a trip on either motor, the
motor that tripped will be prevented from starting until reset is pressed. All starts will default to the
untripped motor. When the trip occurs the MM3 automatically resets the trip to allow the other motor to be
started. The trip message becomes an alarm message which must be reset to allow the tripped motor to
start. If the second motor trips the MM3 will remain tripped until reset is pressed. The details of the Manual
mode are described above under MOTOR SELECTOR A/B above.
Faceplate Stop trips, Process Stop trips and ESD Stop trips MUST be manually reset regard-
less of the Duty/Standby mode. Local Isolator and Plant Interlock trips reset only when the
input is healthy.
NOTE
4-22 MM3 Motor Manager 3
4 SETPOINTS
GE Power Management