Phase & Load Monitoring Relay (FN Series)

Features of the Shiva Amvaj Load Phase Controller (FN Series)

• Current control based on the I2t curve

• Current measurement without CT, with direct cable passage (maximum 25mm²)

• Display of current, set values and error messages

• Protection against

  • Over-current, under-current and current asymmetry

  • Over-voltage, under-voltage and voltage asymmetry, phase loss and phase sequence error

• Voltage display capability

• Two operating modes, manual and automatic, for current control at initial start-up

• 10 indicators to signal

  • OL: Over-current ( 1-100A ),( 0.1-30A )

  • UL: Under-current ( adjustable down to 1 unit below OL)¹

  • A%: Current asymmetry ( 7-100% )

  • OV: Over-voltage ( 400-480V )

  • UV: Under-voltage ( 310-380V )

  • V%: Voltage asymmetry ( 7-25% )

  • OFF: Trip delay ( current error A 0-20 Sec )

  • OFF: Trip delay ( voltage error U 0-10 Sec )

  • Normal: Relay status( blinking: ready for Reset)

  • On Delay: Turn-on delay ( 0-240Sec )

  • Delay Start: Initial start time

    • Manual mode ( 0-120Sec )

    • Automatic mode (5Sec)

(Indicators are steady in setting state and blink in error state)

1. One unit equals 0.1A in the 30A model and 1A in the 100A model. If UL is set to zero, under-current protection is disabled.

Device operation

The FN series load phase controller has two operating modes, which are selected in the settings section:

1. Manual mode (Han): With this mode selected, over-current and under-voltage are not controlled during the initial start time, which can be between ( 0-120Sec).

2. Automatic mode (Aut): In this mode, to prevent motor jamming, over-current and under-voltage are controlled during the initial start time, which is 5 seconds. If the current meets one of the 3 conditions below, the device detects the fault, the relay trips immediately, and the display shows the blinking text HHH:

The passing current is more than twice the device CT value: 60A model:LPFN-30A and 200A model:LPFN-100A

The current is more than 3 times the set maximum current (OL).

The current is above the set maximum current (OL) and continues for 5 seconds, even if it is decreasing, i.e. still above the set maximum current after 5 seconds.

Note: In both operating modes, during the initial start time the display shows the passing current for 2 seconds and the Delay Start countdown for 2 seconds.