GE MM3, Instruction Manual, Page: 105 / 230

CHAPTER 5: SETPOINTS S3 PROCESS
MM3 MOTOR MANAGER 3 – INSTRUCTION MANUAL 5–25
• “STOP A” and “STOP B”: These functions are used for end-of-travel applications.
When an interlock configured for STOP A/B opens the corresponding output relay
will open. When the STOP A/B input is open the motor cannot be started using start
A/B commands or switch inputs.
• “REMOTE RESET”: This function replaces the faceplate RESET key. When this
function is used, 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 function is used in conjunction with the duty/standby
starter type. In 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 function is used in conjunction with the duty/
standby starter type. This input determines the mode of operation for the duty/
standby starter (manual or auto). In auto mode, the MM3 Motor Manager 3 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 Motor Manager 3 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 Motor Manager 3 will remain tripped until reset is pressed. The
details of 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
regardless of the duty/standby mode. Local isolator and plant interlock trips reset
only when the input is healthy.
• STARTUP OVERRIDE DELAY : These setpoints indicate the time that the process
interlock switch can remain open on the occurrence of a motor start. If the switch
remains unhealthy for longer than this time, a process interlock trip or process
interlock stop will occur. If the
STARTUP OVERRIDE DELAY is set to 0, the process
interlock switch must be healthy for the MM3 Motor Manager 3 to allow the motor to
start. If the
STARTUP OVERRIDE DELAY is set to “OFF”, this timer is disabled.
• RUNNING OVERRIDE DELAY : These setpoints indicate the time the process interlock
switch can be unhealthy during normal running. If the process interlock switch goes
unhealthy after a motor start and remains unhealthy for longer than the
RUNNING
OVERRIDE DELAY
, a process interlock trip or process interlock stop will occur. If the
RUNNING OVERRIDE DELAY is “OFF” and the process interlock switch goes unhealthy
after the motor has started, no process interlock trip or process interlock stop will
occur.
• OPERATION : These setpoints determine whether the process interlock feature is a
process interlock trip (reset required in order to restart the motor) or a process
interlock stop (no reset required).
• INSTANTANEOUS ALARM : These setpoints create an alarm whenever the process
interlock switch is unhealthy; there is no time delay associated with this alarm feature.
NOTE