2.3.12 Switch Inputs; Programmable Switch Inputs; 2.3.14 Stop; Start Aand Startb - GE Multilin MM3 Motor Manager 3 Instruction Manual

CHAPTER 2: INSTALLATION

2.3.12 Switch Inputs

2.3.13 Programmable
Switch Inputs

2.3.14 Stop

2.3.15 Start A and
Start B
MM3 MOTOR MANAGER 3 – INSTRUCTION MANUAL
All switch inputs are opto-isolated and operate at 120 V AC. The switch reads closed when
120 V AC is applied to the switch terminal. This 120 V AC can be supplied by an external
source providing that the source is in phase with the MM3 Motor Manager 3 supply
voltage. When the MM3 Motor Manager 3 control voltage switch is set to 240 V AC, the
switch circuit also operates at 240 V AC.
These 10 inputs can be programmed to one of a number of different functions. Some of the
available functions are: setpoint access, lockout reset, plant interlock, auto start, remote
permissive, and test. See the
complete list of available functions.
If this terminal is de-energized, both contactor A and contactor B output relays will open
causing the contactor coils to de-energize. The stop input must be energized before the
MM3 Motor Manager 3 will process any start commands.
When the start input terminals are energized, the corresponding contactor output relay is
energized provided all other valid start conditions are met. If any trip occurs, both
contactor outputs become de-energized. The start A input is used for all types of
contactors, that is: full voltage non-reversing, two-speed (low-speed), reversing, wye delta
open transition, inverter, slip ring, autotransformer, part winding, or wye delta closed
transition. The start B input is used for reversing and two-speed (high-speed) contactor
control. Start inputs are usually momentary unless two-wire control is used. Start A and B
commands may also be initiated via the serial link.
Figure 2-3: RS485 termination
S3 PROCESS PROGRAMMABLE INPUTS
INPUTS AND OUTPUTS
setpoints page for
2–5