LMR10 Motor Load Monitor Relay

LMR10 Motor Load Monitor Relay
LMR10 Motor Load Monitor Relay
Brand: Synctek Pty Ltd (Australian Designed & Manufactured)
Product Code: LMR10S
Availability: Out Of Stock

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The LMR-10 Series of Electronic Load Monitors provide a unique modern solution for the monitoring and protection of any motor driven machinery.
These devices monitor TRUE motor torque/power using specially designed proprietary electronic circuitry (developed by Synctek) that provides extremely accurate, fast and a Linear response to all motor load conditions.

The LMR-10 Load Monitor Relay can be used with ANY size motor, is EASY to install and requires NO special mechanical alterations or wiring to existing equipment. Existing CT's may be used for monitoring any motor power rating to provide a motor-load protection system that will save your plant and machinery from costly repairs and production downtime.

Using the LMR-10 eliminates costly and very time consuming mechanical repairs and or plant "down time". The highly reliable electronic circuitry in the LMR-10 itself means that absolutely no maintenance is required after initial commissioning. The LMR-10 can be used to provide extremely fast overload protection when used as an Electronic Shock Relay, and or Electronic Shear Pin - potentially saving you many thousands of dollars. All functions are fully adjustable!

The LMR-10 provides fully automatic torque overload protection that makes all past and present mechanical protection devices obsolete. No more unreliable shear pins, clutches or other torque limiting devices are required. Because the LMR-10 senses “real power” it can also provide many other useful power/torque monitoring functions as well, some of the more common applications are listed in the table below.

The LMR-10 is typically - 10 times more sensitive than simple current monitoring devices because it senses true input power. It is extremely accurate and very responsive to even small changes in load power, the LMR-10 automatically compensates for changes in power factor by unique circuitry developed by SYNCTEK.

The LMR-10 has two built-in set points that can be used for a number of applications. The HIGH SET POINT will activate on increasing loads, while the LOW SET POINT will activate on decreasing loads. Individually programmable time delays are built in to the system. these will delay any trip functions until a set time is exceeded - thus avoiding nuisance tripping and false alarms under different circumstances.
The LMR-10 also provides as standard an analog output signal 0-13v (a 4-20mA option is also available) which may be connected to external monitoring and or recording equipment (e.g. data loggers, chart-recorders, PLC's). The built-in load meter displays actual percentage load - this provides an accurate indication of the monitored process.
The built-in meter display is also used to directly read & display the set point values - making adjustments extremely simple. Wider Calibration is set via an 10 way DIP switch which is pre-set for most power ranges up to 350KW, an internal FINE trimpot may also be used for non-standard loads if desired.


  • Monitors Power Ranges from 0.18kW to 350kW
  • Monitors True Input Power / Torque which is LINEAR
  • Extremely accurate and fast response
  • Extremely sensitive even at very low loads
  • Single Phase or Three Phase Monitoring
  • Built-in Electronic Shock Relay Function (Shear Pin)
  • Adjustable Over Load Detection form 50 - 150%
  • Adjustable Under Load Detection from 0 - 75%
  • Adjustable Trip delay timers from 0 - 6 seconds
  • Automatic Motor Start delay timer from 6 - 25 seconds
  • Latching and/or Non-Latching Trip functions
  • Easy set-up with metered set-point adjustments
  • External Trip Inhibit control function
  • Internal and/or External fault reset function
  • No mechanical connection is required
  • Not damaged by overloads
  • Analogue monitor output 0-13V (4-20mA optional)
  • Fully isolated electronic controls
  • Small compact design - Fully enclosed to IP 40
  • Full 12 months warranty
  • Full technical and service support



Drive Belt Slipping
Drive Belt Breakage
Drive Chain Breakage
Gear Box Failure
Pump monitoring - detect Dry Running - Loss of fluid
Pump monitoring - detect loss of load
Pump monitoring - detect opening/closing of valves
Detect the end of a process - End of Mix
Detect the end of a process - Empty buckets in elevator
Detect the end of a process - Part or tool is missing
Detect the end of a process - Extruder material is ready
Detect beginning of Process - Tool has touched work piece
Detect beginning of process - Conveyor is now loaded
Detect beginning of process - Mixer is loaded correctly
Detect Viscosity in a mixing process
Monitor Pump Power to determine - Flow
Loss of Prime
Foreign Obstructions
Monitor Machine Tools for - Tool detection
Drill tool wear
Automatic process

  • Torque                       
  • Pressure
  • Flow
  • Viscosity
  • Load
  • Feed Rate
  • Overload
  • Underload
  • Start of Process
  • End of Process
The LMR-10 does NOT simply measure CURRENT as in many other load protection relays on the market. The LMR-10 measures POWER which is a linear quantity, a change in load will thus provide a direct change in power.
Simply monitoring motor currents for example does not give a linear function of load. At small loads the motor current does not vary a great deal - the quantity that changes is the motor power factor (PF). This can vary typically from 0.1 to 0.9 for most motors as load changes from no-load to full load. The power factor is the Cosine of the angle (or delay) between the motor voltage and motor current - In most motors the current always LAGS the voltage.
For most motors the power factor will improve as the load is increased in a NON - LINEAR fashion as shown below. Figures 1 and 2 below illustrate the effect of measuring the motor power as compared to measuring the motor current when the load is varied from no-load to full-load.












The typical motor current verses load curve is highly non-linear, certainly not a good indicator of motor shaft power load or torque. Current changes are relatively insensitive to changes in load and therefore does not provide very useful information about the true load conditions which may be very critical in some cases.Motors are too often significantly “over-sized” in most applications, this results in two major problems (1) there is potential for the motor to provide damaging overloads to its feeding gearboxes, drive components and critical plant machinery without the motor itself becoming overloaded or damaged in any way. (2) under-loaded motors are very inefficient and waste energy, most plant operators never know this unless they can monitor their energy consumption. Therefore you need to have a good measure of “true motor shaft power”, power factor and enrgy consumed.

The curve in Figure 2 above clearly illustrates the linear nature of motor power verses motor load. The LMR10 is designed to measure true motor power it does this using proprietary electronic circuits in order to obtain a value for true motor shaft power or torque and provides a linear signal that is directly proportional to power transferred to the load. The circuit design is analogue based and an inherently fast reposnse is attained in order to produce very useful information about motor loading. This signal processing tells us about the true motor load conditions which may acted upon very quickly. In addition the LMR10 also provides an optional 4-20mA output signal which may be used for indicating purposes and or further processing. Plant operators and systems administrators now have a very valuable protection and monitoring system available to them.



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