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4 SETPOINTS
•
AUTO PERMISSIVE: This function is used together with the AUTO START A / AUTO START B functions
and can be further defined using the AUTO PERMISSIVE INDICATION and AUTO MODE setpoints. If the Auto
Permissive Switch is healthy, start commands can come from the Auto Start A / Auto Start B switches.
When the Auto Permissive Switch is unhealthy the Auto Start A / Auto Start B switches are ignored. When
the Auto Permissive Switch is healthy, start commands via the Start A and B switch inputs and the face-
plate are blocked. See AUTO PERMISSIVE INDICATION and AUTO MODE setpoint descriptions for further func-
tionality.
•
AUTO START A: This function is used in conjunction with the AUTO PERMISSIVE function described
above. When the Auto Permissive switch is healthy, the Auto Start A switch can be used to start the motor.
•
AUTO START B: This function is used together with the AUTO PERMISSIVE function. When the Auto
Permissive switch is healthy, the Auto Start B switch can be used to start the motor in applications where
Start B is used (Two Speed and Reversing starter types).
•
AUTO PERMISSIVE INDICATION: This setpoint determines whether the AUTO or MANUAL indicator
LED is illuminated when in the auto permissive mode. This allows the AUTO LED to be used for auto per-
missive and serial control, or just for serial control.
•
AUTO MODE: This setpoint can be configured to either 'SERIAL' or 'HARD-WIRED'. When in the 'SERIAL'
mode and the 'AUTO' button is pressed, the MM3 will execute start commands from the RS485 serial link
only. When in the 'HARD-WIRED' mode and the 'AUTO' key is pressed, the MM3 will execute start com-
mands from the 'AUTO START A' and 'AUTO START B' switch inputs only. Note: The 'AUTO PERMIS-
SIVE' switch input must be healthy in order to do auto starts. This setpoint allows the user to change the
control mode from MANUAL to HARD-WIRED AUTO via the AUTO/MANUAL buttons instead of having it
done automatically when the Auto Permissive switch input is put into the healthy position.
•
RESET EMERGENCY STOP TRIP: This function is used when a separate Emergency Stop Trip Reset
switch is required. When this switch is healthy and an Emergency Stop Trip is present, the trip will be reset.
•
RESET UNDERCURRENT TRIP: This function is used when a separate Undercurrent Trip Reset switch is
required. When this switch is healthy and an Undercurrent Trip is present, the trip will be reset.
•
TWO WIRE CONTROL: This function is used to provide a means to switch from normal pulsed three wire
start / stop control to maintained two wire start / stop control. When this switch is healthy, start commands
(Start A / Start B switch inputs Auto Start A / Auto Start B switch inputs) must be maintained in the closed
state in order for the MM3 to keep the motor running. When the Start input is opened, the MM3 sees this
as a STOP command and both contactor outputs will open. This is useful in applications with limit
switches, PLC control or Hand/Off/Auto control.
•
TEST SWITCH: This function is used to create a Test switch facility. When the Test switch input is healthy
statistical counters (see actual values A4: STATISTICS \ COUNTERS) are not incremented with the exception of
the interlock counter. This is used when control tests on the contactor are being performed and counters
should not be updated. Note: if the motor is running when this switch is put into the healthy position, both
contactors will open.
•
REMOTE PERMISSIVE: This function provides a means to interlock between the keypad START A /
START B keys and the Start A / Start B switch inputs. When a Remote Permissive switch is not used both
of these start command sources will operate when the MM3 is in Manual mode (MANUAL LED on). When
the Remote Permissive switch is healthy, the Start A / Start B switch inputs are functional but the START A
/ START B keypad keys are disabled. When the Remote Permissive switch is unhealthy, the START A /
START B keypad keys are functional but the Start A / Start B switch inputs are disabled. Note: Auto mode
or Hardwired Auto mode (AUTO LED on) disables both the Start A / Start B switches and the START A /
START B keypad keys.
•
COMMUNICATION SELECT: This function provides a facility to override the keypad AUTO / MANUAL
keys. When this switch is healthy the MM3 is forced into Auto Serial mode (AUTO LED on). When this
switch is unhealthy, the MM3 reverts back to the mode that was present before the switch was closed
(Manual mode-MANUAL LED on or Hard-Wired Auto mode-AUTO LED on).
GE Power Management
MM3 Motor Manager 3
4.4 S3 PROCESS
4
4-21
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