Page 22 - Sace Emax 2 Manual for design engineers

ABB | SACE Emax 2
1 - Protections - Introduction

Operating principle The protection functions are available with all Ekip Dip versions.
1. If the signal measured exceeds the set threshold, the specific protection activates (prealarm and/or
alarm).
2. The alarm appears on the display and, after a period of time (timing t ), depending on the protection
t
parameters set, can convert into a trip command (TRIP) transmitted to the internal Trip coil of the
CB.
NOTE:
• if the signal measured drops below the set threshold before the trip time has elapsed, Ekip Dip
quits the alarm and/or timing state and returns to the normal operating condition
• all protections have a default configuration: check the parameters and change to suit the
installation requirements before putting into service
• to allow circuit-breaker tripping to be controlled by a specific protection, the protection itself
must be enabled

L Protection L protection protects against overloads
NOTE: the protection is available and active for all the versions of the trip unit.
t I1 L When the activation threshold is exceeded, the protection trips in a time that decreases as the current read
increases.
Parameters
t1
All the parameters that can be modified by the user affect the response curve, and related tripping times.
I Parameter Description
The value I1 contributes in calculating the tripping time, and also defines the current
value that, if exceeded, activates the protection (with reference to the curve, it is the
part parallel to the y-axis).

Threshold I1 IMPORTANT:
• The protection is activated and starts timing for currents between
1.05 and 1.2 of the threshold I1 set .
(1)
• The delay is interrupted if the current drops below the activation
threshold.
The value t1 contributes in calculating the tripping time (with reference to the curve,
T1 affects the entire curve by shifting it as a whole along the y-axis).
Time t1 IMPORTANT:
The protection limits the tripping time to 1 second in two cases:
• if, according to the calculation, the time is less than 1 second.
• If the fault current is greater than 12 In.

(1) Example (with I1 set to 400 A): the protection is activated for currents between 420 A and
480 A.

With the module Ekip T&P and with the Ekip Connect software, it is possible to activate the function Thermal
Memory, and adjust the threshold of Pre-alarm.

20 | © 2020 ABB | 1SDH001330R1002 - ECN000134959 - Rev. A Ekip Dip | 1 - Protections - Introduction