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2.1 MOUNTING
2
STATUS INDICATORS:
RUNNING: Contactor is energized
and motor is running.
STOPPED: Contactor is not ener-
gized and motor is not running.
TRIPPED: Contactor is not ener-
gized. Motor is not running. The
MM3 has tripped the motor due to
a fault. Normally a cause of trip
message will be displayed.
ALARM: One or more alarm condi-
tions are present. Normally a
cause of alarm message will be
displayed.
SWITCH INPUTS
Opto-isolated 120/240 VAC live inputs for various interlock functions. The
interlock inputs are fully programmable and can be assigned to such
functions as setpoint access, plant interlock, test, and various others.
ANALOG INPUT/OUTPUT
4 - 20mA input for process
control monitoring /
alarming / tripping.
COMMUNICATIONS
RS485 2 wire serial
communication port
operates at 1200 - 57,600
bps for remote
commands, monitoring
and setpoint store.
ModBus
®
RTU protocol.
2-2
Front View
DISPLAY:
2 line, 40 character illuminated display
communicates all messages in simple
English for easy interpretation by users
unfamiliar with unit.
Rear View
THERMISTOR
NTC or PTC thermistor
input for hot winding
detection.
RESIDUAL GROUND INPUT
PHASE CT INPUTS
3 isolated phase CT inputs
Figure 2–2: FEATURES
MM3 Motor Manager 3
RELAY INDICATORS:
RELAY A: Contactor A energized.
RELAY B: Contactor B energized.
AUX 1: User programmable relay 1 energized.
AUX 2: User programmable relay 2 energized.
GROUND CT INPUT
Ground
50:0.025 ground fault
safety and
input.
surge
2 INSTALLATION
PROGRAM KEYS:
ACTUAL VALUES: Press to enter
actual values mode to display actu-
al motor values such as current,
ground leakage, thermal capacity.
SETPOINTS: Press to enter setpoint
mode to alter or examine setpoints.
STORE: Save a newly entered
setpoint.
RESET: Reset the MM3 after a trip.
MESSAGE: Move to the desired
setpoint or actual value message.
VALUE: Increment or decrement
currently displayed setpoint value.
CONTROL KEYS:
AUTO: Selects
operation of start via communi-
cation port.
MANUAL: Selects manual opera-
tion of motor using start key.
START A: Energize contactor A.
START B: Energize contactor B.
STOP: De-energize contactors.
SUPPLY VOLTAGE
required to power the MM3
VOLTAGE INPUT
Phase A voltage input for
voltage and power monitoring.
CONTROL POWER
120/240 VAC supply voltage
selector switch and fuse
access door
4 RELAYS
Contactor A: direct on
line / forward / wye
Contactor B: reverse / delta
User programmable relay
(AUX 1)
User programmable relay
(AUX 2)
Ground safety
GE Power Management
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