
CHAPTER 10: MISCELLANEOUS
MM3 MOTOR MANAGER 3 FAQ
MM3 MOTOR MANAGER 3 – INSTRUCTION MANUAL
10–7
10.3 MM3 Motor Manager 3 FAQ
10.3.1 Frequently
Asked
Questions
Listed below are some of the more frequently asked questions by users of the MM3 Motor
Manager 3. The list includes questions asked by consultants before the MM3 Motor
Manager 3 has even been specified to the end user and after the MM3 Motor Manager 3 is
installed and controlling a motor.
Does the MM3 Motor Manager 3 support ladder logic as in a PLC?
No. The MM3 Motor Manager 3 switch inputs do not allow total programmability as in PLCs;
however, it does have a range of over 30 different dedicated functions that can be
assigned for typical applications. These functions come complete with built in timers if
necessary for that particular function. For example: Auto Permissive and Auto Start for PLC
hard wired control, Two Wire Control for PLC starts or jogging, Process Interlocks with
starting and running override timers for pressure and flow monitoring. All the
programmable switch inputs may be configured as normally open or normally closed.
Does the MM3 Motor Manager 3 have any hot winding protection?
Yes. The MM3 Motor Manager 3 has a single thermistor input to protect the motor against
hot windings. These thermistors are typically wound into stator windings of the motor
when manufactured and can be Positive Temperature Coefficient (PTC) of Negative
Temperature Coefficient (NTC).
After wiring the MM3 Motor Manager 3 into the control circuit, it remains UNAVAILABLE
for starts. What does this mean?
Three conditions can cause the MM3 Motor Manager 3 to remain UNAVAILABLE for starts”
1.
The MM3 Motor Manager 3 has tripped on a trip condition
2.
The STOP switch input (terminal 11) is not energized.
3.
If a Process Interlock function is assigned to one of the programmable switch inputs
and the startup override is set to 0 seconds, the MM3 Motor Manager 3 will remain
UNAVAILABLE until that switch input is energized.
When a start is attempted, the motor starts for a second then shuts off. The MM3
Motor Manager 3 displays an
OPEN CONTROL CIRCUIT
alarm. What is the problem?
The MM3 Motor Manager 3 must see feedback from the Contactor A and, if used,
Contactor B within 1 second of the MM3 Motor Manager 3 closing the contactor or the
MM3 Motor Manager 3 will stop the motor as it assumes that there is a problem in the
circuitry for the motor contactor coil. The feedback from the contactors go to the status
inputs (terminals 15 and 16) of the MM3 Motor Manager 3.
This condition will result in the toggling of the motor contactor when the MM3 Motor
Manager 3 is in the two-wire mode as there can be a constant start signal from the two
wire device. Use the open control circuit trip feature to prevent the toggling of the motor
contactor.
After connecting the MM3 Motor Manager 3 through an interface device to a PLC
network, communications to the MM3 Motor Manager 3 cannot be established. What is
the problem?
Verify the following:
1.
The master communicating with Modbus
®
RTU protocol.
NOTE
Содержание MM3
Страница 8: ...vi MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL TABLE OF CONTENTS ...
Страница 11: ...CHAPTER 1 INTRODUCTION OVERVIEW MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL 1 3 Figure 1 1 Functional block diagram ...
Страница 18: ...1 10 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL TECHNICAL SPECIFICATIONS CHAPTER 1 INTRODUCTION ...
Страница 80: ...4 18 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL CHASSIS MOUNT UNITS CHAPTER 4 SOFTWARE ...
Страница 124: ...5 44 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL S7 TESTING CHAPTER 5 SETPOINTS ...
Страница 198: ...8 54 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL MODBUS MEMORY MAP CHAPTER 8 COMMUNICATIONS ...
Страница 220: ...10 14 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL GE MULTILIN WARRANTY CHAPTER 10 MISCELLANEOUS ...