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3. Usage
3. Usage
3. Usage
3. Usage
3.1 What is a Shock Monitor?
The Shock Monitor TSM4000 is a product intended for load monitoring and overload
protection of general industrial machinery by detecting the consumed power supplied to
a motor (3-phase induction motor).
Target machinery
General industrial machinery such as conveyors, mixers, and pumps
Load detection method
The Shock Monitor captures the voltage and current of the motor used for driving
equipment and detects the power consumption of the motor.
Overload recognition method
The Shock Monitor compares the detected load with the preset overload detection level.
When the overload status continues for a specified period (Shock Time) or longer, the
monitor notifies an external device of the abnormal load.
Three types of abnormal signals, two for upper limit (overload) and one for lower limit
(underload), are provided, which can be used as a predictive signal or a motor stop signal.
The load recognition is suspended for a preset time (Start Time) when the motor starts
in order to avoid erroneous output during acceleration.
3.2 Electric power detection function
What is the electric power of a motor?
It is the amount of energy required to generate torque of a motor and is referred to as
effective electric power. It is calculated as: Voltage x Current x Power factor.
The motor current is affected by motor voltage and hardly changes under light load. On
the contrary, the electric power has an almost proportional relationship with the motor
torque at a constant frequency. Consequently, it is possible to detect the change in the
load by using electric power, even when the load is light.
Electric power detection by Shock Monitor
The Shock Monitor allows electric power detection with simple wiring by detecting the
current of one phase of the three-phase electric power and providing the result for
three phases through internal calculation.
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Change
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Power
Current
Change in load
Change in power/current vs. Change in load