Characteristics of Micrologic Electronic Trip Units
Introduction
Micrologic electronic trip units provide the following functions:
o Protection of the electrical distribution or specific applications
o Measurement of instantaneous values and measurement of average values (demand) for electrical quantities
o Kilowatt hour metering
o Operational assistance such as peak demand, customized alarms, and operation counters
o Communication
Identification
Identify the trip unit installed on the circuit breaker by using the four characters on the front face:
Micrologic Trip Unit Families
The range of Micrologic trip units is made up of several families:
o Micrologic 1, 2, and 4 without display screen
o Micrologic 5, 6, and 7 with display screen.
On Micrologic 1, 2, and 4 trip units, the protection functions are set using adjustment dials on the front face of the trip unit:
On Micrologic 5, 6, and 7 trip units, the protection functions are set:
o By using the adjustment dials
o By additional settings on the keypad. Setting values are displayed on the screen
o Through EcoStruxure Power Commission software.
For more information about the Micrologic 5, 6, and 7 trip units, refer to DOCA0141EN , Compact NSX Micrologic 5/6/7 Electronic Trip Units - User Guide .
In Rating of Micrologic Trip Units
The In rating (in amps) of a Micrologic trip unit corresponds to the maximum value of the long-time protection (Ir) setting range for the trip unit. The setting range is indicated on the label on the front face of the trip unit (this label is visible on the front face of the Compact NSX circuit breaker after the trip unit has been fitted).
Example: Micrologic 5.2 A 250 trip unit:
o Setting range: 100-250 A
o In rating = 250 A
Distribution Trip Unit
The following figure and table define the protection functions for distribution-type Micrologic trip units.
Thermal Memory
The thermal memory is used to simulate temperature build-up and cooling in conductors caused by current variations, according to a time constant. In the event of an overload, the trip units with a thermal memory memorize the build-up temperature caused by the current. Memorizing the build-up temperature leads to a reduction in the trip time.
All Micrologic trip units incorporate a thermal memory as standard:
o For Micrologic 2 and 4 trip units, the time constant is 15 minutes.
o For Micrologic 5, 6, and 7 trip units, the time constant is 20 minutes.
Motor Trip Units
The following figure and table define the protection functions for Micrologic type M trip units.
Motor Trip Unit: Additional Protection
Micrologic type M trip units (in particular Micrologic 6 E-M) also incorporate additional protection for the motor application. For more information, refer to DOCA0141EN , Compact NSX Micrologic 5/6/7 Electronic Trip Units - User Guide .
Indication LEDs
Indication LEDs on the front of the trip unit indicate its operational state.
The LEDs and their meaning depend on the type of Micrologic trip unit.
The indication LEDs function for circuit breaker load currents:
o Above 15 A on a Micrologic trip unit rated 40 A
o Above 30 A on Micrologic trip units rated > 40 A
The limit value is indicated on the front panel, above the Ready LED of the Micrologic trip unit.
NOTE: For the Micrologic 4 and 7 trip units, the protection functions are supplied by a second power supply, in addition to the current transformer supply. The Ready LED blinks irrespective of the load, indicating that the standard protection functions are operational.
To activate the Ready LED when the load current is below the limit value, you can:
o Install a 24 Vdc external power supply module which allows the trip unit to be monitored continuously, even when the circuit breaker is open. For more information, refer to Compact NSX & NSXm Catalogue .
o Or, during maintenance visits, connect the pocket battery to monitor the trip unit.
NOTE: If the pre-alarm and alarm LEDs keep lighting up, perform load shedding to avoid tripping due to a circuit breaker overload.
Micrologic trip units come with a test port specifically for testing trip unit operation .
This port is designed for:
o Connecting the pocket battery for local Micrologic testing
o Connecting the USB maintenance interface for testing, setting the Micrologic trip unit, or for installation diagnostics
Interchangeability of Micrologic Trip Units
Onsite replacement of trip units is simple:
o No connections to make
o No special tools (for example, calibrated torque wrench)
o Compatibility of trip units provided by mechanical cap
o Torque limited screw provides correct torque
The simplicity of the replacement process means that it is easy to make the necessary adjustments as operation and maintenance processes evolve.
NOTE: The screw head is accessible when the trip unit is installed, so the trip unit can still be removed.
NOTE: On the Compact NSX with R, HB1 and HB2 breaking performances the trip units are not interchangeable.
Sealing the Protection
Seal the transparent cover on Micrologic trip units to prevent modification of the protection.
On Micrologic 5, 6, and 7 trip units, it is possible to use the keypad, with the cover sealed, to read the protection settings and measurements.
DOCA0140EN-01
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Molded case circuit breaker, PowerPacT 4, 3P, Icu 50kA, MicroLogic 2.3 electronic trip unit, 400A rating. PP44003X. EAN Code: 5018934030470. Find a reseller. Contact Sales Contact support Subscribe to the newsletter. Products. Products Documentation Software Downloads Product Selector Product Substitution and Replacement
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