Setting MicroLogic 7.0 P Trip Unit

You can set the tripping curve of your MicroLogic 7.0 A trip unit to match the needs of your installation using the following parameters:

Long-time current setting Ir
Long-time time delay tr
Short-time pickup Isd
Short-time time delay tsd
Instantaneous pickup Ii
Earth-leakage pickup IΔn
Earth-leakage time delay Δt

Set the Threshold Values Using the Dials

In this example, the rated current In of the circuit breaker is 2000 A.

In = 2000 A

Ir = 0.5 x In = 1000 A

Isd =2 x Ir = 2000 A

Ii = 2x In = 4000 A

IΔn = 1 A

Tripping curve with I²t short-time ON

Tripping curve with I²t short-time OFF

Set the Time Delays Using the Dials

In this example, time delay tr of the circuit breaker is 1 second, time delay tsd is 0.2 seconds with I²t short-time ON and time delay Δt = 140 milliseconds

		Tripping curve with I²t short-time ON	Tripping curve with I²t short-time OFF

Adjusting Protection Settings Using the Keypad

To adjust the settings of the long-time, short-time, and instantaneous protection functions, refer to MicroLogic 5.0 P settings.

To adjust the settings of the earth-leakage protection function:

Select > Current protection > I (A).
Use the buttons below the display screen to select, confirm, and save the settings.