Setting Mode

Protection Function Setting

WARNING
HAZARD OF NUISANCE TRIPPING OR FAILURE TO TRIP Protection setting adjustments must be done by qualified electrical personnel. Failure to follow these instructions can result in death, serious injury, or equipment damage.

The protection function settings can be set:

By a dial and fine-tuned on the keypad for the standard protection functions
On the keypad for all protection functions

The up arrow on the display indicates the protection function currently being set.

Setting a Protection Function Using a Dial

Use an adjustment dial to set the following protection functions:

The Ir and Isd pickups for MicroLogic 5 trip unit
The Ir and Ig pickups for MicroLogic 6 trip unit
The Ir and IΔn pickups for MicroLogic 7 trip unit with integrated earth-leakage protection

Turning a dial results simultaneously in:

Selection of the screen for the protection function assigned to the dial
Unlocking (if necessary) the padlock (the navigation interface is in protection function setting mode)
Setting the protection function assigned to the dial to the value indicated on the dial and on-screen.

Setting a Protection Function on the Keypad

Use the keypad to fine-tune the protection function:

The setting value cannot exceed that indicated by the dial.
All the protection function settings are accessible on the keypad.

Press the key successively to scroll through the protection function screens. Scrolling is cyclical.

Navigate through the protection function settings with the and navigation keys.

Use the key to select the function to set:
- The up arrow indicates the selected function.
- The down arrow indicates phase. Multiple down arrows indicate all phases set to the same value (except for the neutral protection setting).
- Scrolling is cyclical.
Set the protection functions on the keypad with the keys.

The associated navigation arrows indicate the setting options:
- : possible to press the key (increases the setting value)
- : possible to press the key (decreases the setting value)
- : possible to press one of the two keys

Confirmation of Setting

The value of a protection function set on the keypad must be:

validated by pressing the key once (the OK pictogram blinks on the display)
then confirmed by pressing the key again (the text OK displays for 2 s).

NOTE: Setting using a dial does not require any validation/confirmation action.

Example of Presetting a Protection Function Using a Dial

The following table illustrates presetting and setting the long-time protection Ir pickup on a MicroLogic 5.2 trip unit rated 250 A.

Press the key to scroll through the metering screens.

Press the , and navigation keys to select the metering screen for each of the phases.

Step	Action	Using	Display
1	Set the Ir dial to the maximum value (the padlock unlocks automatically). The down arrows indicate all three phases (the setting is identical on each phase).
2	Turn the Ir dial to the setting above the value required.
3	Presetting is complete: If the pickup setting value is correct (in this case, 175 A), exit the setting procedure (no validation is required). The long-time protection Ir pickup is set at 175 A. If the pickup setting value is not suitable, fine-tune it on the keypad.
4	Set the exact value required for Ir on the keypad (in increments of 1 A).
5	Validate the setting (the OK pictogram blinks).
6	Confirm the setting. The confirmation OK displays for 2 s.

Example of Setting a Protection Function on the Keypad

The following table illustrates setting the long-time protection tr time delay on a MicroLogic 5.2 trip unit.

Press the key to scroll through the screens.

Press the , and navigation keys to select the screen for each of the phases.

Step	Action	Using	Display
1	If the pictogram is displayed, unlock the protection settings.
2	Select the Protection function setting mode.
3	Select the tr function: the up arrow moves under tr.
4	Set the tr value required on the keypad.
5	Validate the setting (the OK pictogram blinks).
6	Confirm the setting. The confirmation OK displays for 2 s.

Verification of the Protection Function Setting

In Protection function setting mode, a setting can be a relative value.

In Protection function readout mode, the setting is an actual value (for example in amps).

For example, to determine the actual value of a function currently being set as a relative value before validating the setting:

Press the lock/unlock microswitch once (the display switches to Readout mode on the function currently being set and indicates the actual setting value).
Press the microswitch again (the display reverts to Setting mode on the function currently being set).

Example of Verification of a Protection Function Setting

The following table illustrates as an example the verification of the setting for the short-time protection Isd pickup on a MicroLogic 5.2 trip unit currently being set:

Step	Action	Using
1	The display is in Setting mode on the Isd function: The pictogram is displayed. The Isd pickup setting is in multiples of Ir.	–
2	Lock the setting: The display switches to Setting readout mode on the Isd function (the pictogram is displayed). The Isd pickup setting is a value (715 A in the example).
3	Unlock the setting: The display reverts to Setting mode on the Isd function. The pictogram is displayed.

Step

Action

Using

Display

The display is in Setting mode on the Isd function:

The pictogram is displayed.
The Isd pickup setting is in multiples of Ir.

–

Lock the setting:

The display switches to Setting readout mode on the Isd function (the pictogram is displayed).
The Isd pickup setting is a value (715 A in the example).

Unlock the setting:

The display reverts to Setting mode on the Isd function.
The pictogram is displayed.