Under Current Protector

Applications

Pumping cavitation or loss of prime

Detect malfunction of fans

Broken belt or coupling failure

Shut down motors when unloaded

Features

Adjustable underload protection

Trip delay adjustment

Wide current adjustment range

Trip indication LED

Remote electrical reset

Low energy consumption/Compact design

Operates in wide ambient temperature range

Benefits

Simple to commission

Reduced spares inventory

Assists in fault finding

Safe remote reset

Less cubical space required

Consistent accuracy

Specifications

TRIP TIMES

Under current Definite time 0.2-30sec.

CURRENT SETTING RANGE

05Type 0.5-5amps

30Type 3.0-30amps

60Type 5.0-60amps

100-600Type With external current transformers

CURRENT SENSING 2CT

CONTROL VOLTAGES

24 24Vac/dc

110 110Vac

220 240Vac

440 440Vac

Other voltages aviliable by request

FREQUENCY 50/60Hz

OUTPUT RELAY

1-changeover contact

3A/250Vac resistive

OPERATING CHARACTERISTIC

Definite time

TRIP INDICATION Red LED

TOLERANCE

Current +/-10%

Time +/-15%

AMBIENT TEMPERATURE

Storage -30-80℃

Operation -25-70℃

Humidity 45-85%

Without condensation

INSULATION

Between casing and circuits

Over 10M @ 500 VDC

DIELECTRIC STRENGTH

Casing ＆circuit 2kV

Between contacts 1kV

Between circuits 2kV

MOUNTING

35mm DIN rail/surface

Motor Under-load Application

• To achieve the desired trip time, you need to adjust the trip time adjustment setting (1) accordingly.

• To adjust the current, simply set the desired trip current as the new value for the current adjustment (2).

After following the typical wiring diagram and connecting all the necessary components to the relay, control power can be applied when the motor is turned on. At this point, the red LED on the relay should be off, indicating that everything is working properly. It's important to double-check all connections before applying power, to ensure the safety and functionality of the system. With correct installation and careful attention to detail, the relay should function as intended and provide reliable power control for the motor.

To activate the test button, press and hold it down until the red LED light comes on. After a certain amount of time, known as the trip time adjustment, the relay will activate. In order to reset the Under Current protector, you have two options: manually press the reset button located on the relay facia, or perform a remote electrical reset by interrupting the control supply.

One convenient feature of the red LED is its ability to indicate the actual load current drawn from the power supply, eliminating the need for an ammeter. To determine the load current, simply adjust the current adjustment (2) clockwise from its fully anti-clockwise position. As the adjustment is turned, the LED will start to flash once the actual load current is reached. This flashing LED can be read against the calibrated scale to accurately determine the current. This capability is particularly advantageous when high accuracy is required in measuring the load current.

Fine Under load Adjustment

• Ensure that the required trip time is set as the trip time adjustment (1).
• Follow the original text information but generate a completely different way of speaking by using a language model instead of the ChapGPT conversation style.

To determine the real load current, simply follow the given steps. The first step is to measure the voltage across the load using a voltmeter. Next, measure the resistance of the load using an ohmmeter. Once these values are obtained, use them to calculate the current flowing through the load by applying Ohm's law. In doing so, divide the voltage by the resistance to obtain the current. Upon obtaining the calculated value, it can be compared to the rated value to ensure that the load is functioning correctly. This procedure is essential for ensuring that the load is operating within its designed parameters and will help avoid potential damage or failures.

Ensure that the current adjustment (2) is calibrated slightly lower than the real-time load current level.

The Under Current protector will trip if the load current falls below the preset level after the trip time adjustment has passed. It is important to note that this generated content is based on the original information but is presented in a different manner.

Test and Reset

The front facia is equipped with two push buttons for convenient access. One of them is the test button, which enables the operator to evaluate the relay's functionality when the control power is applied and the motor is in operation. On the other hand, the reset button is designed to provide an immediate reset for the relay. In addition to these local reset options, it is also possible to remotely reset the relay by simply interrupting the control power that is being supplied to terminals L1 and L2.

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