Page 78 - SACE Tmax XT - Catalogue

3/44 SACE TMAX XT LOW VOLTAGE MOLDED CASE CIRCUIT-BREAKERS

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Ekip Touch/Hi-Touch

Protection functions

Distorted waveform:
Base + 3rd Harmonic
240 V
0 V
3rd Harmonic
-240 V
(150 Hertz)
Base Sine Waveform
(50 Hertz)
Distorted waveform: Adaptive protection: dual setting of protections (Set A-B)
Base + 3rd Harmonic
The Ekip Hi-Touch can store a set of alternative parameters (set B) for all protections. This second set
240 V
Set B can replace the default series (set A) with an external control. A typical application for dual settings may
0 V
3rd Harmonic be when an emergency source is activated in the system, causing a change of load capacity and short-
-240 V Set A
(150 Hertz)
Base Sine Waveform circuit levels, and in cases of switchgear maintenance to protect the operator against electric arcs (the
(50 Hertz)
Trigger event minimum trip delays of set B guarantee safety for the operator).
It is possible to activate series B by:
t IEC 60947-4-1 • Digital input, available with an Ekip Signalling module;
Set B
Table 2 • Communication network, by means of one of the Ekip Com communication modules;
Set A • Directly from the Ekip Hi-Touch display;
• Using a settable internal time, after the circuit-breaker has closed.
Trigger event
Distorted waveform:
Base + 3rd Harmonic
I
240 V L Motor protection overload in compliance with Standard IEC 60947-4-1 Table 2
t IEC 60947-4-1
t 0 V Table 2 The L function protects the motor against overloads in accordance with the indications and classes
-240 V 3rd Harmonic defined by Standard IEC 60947-4-1 and the Table 2. The trip time is established by choosing the
(150 Hertz)
Base Sine Waveform appropriate trip class, which depends on the motor that must be protected. In addition to this
(50 Hertz)
Ij/Is
protection, the thermal memory function (implemented in accordance with Standard IEC60255-8 and
ti/tj I the above-mentioned Standard) is permanently activated. After tripping the Ekip M Touch LRIU, the
f thermal memory is active for a time that depends on the trip class selected (see table).
Set B
t The protection unit will trip faster than the time established for a cold fault condition if a new overload
Set A
occurs before the thermal memory automatically resets (hot trip condition). The protection has a
t “start-up” stage from the moment the current exceeds 0.25xIn to the moment the minimum time of the
Ij/Is
Trigger event selected trip class is reached.
ti/tj
Iu
t IEC 60947-4-1 f TRIP CLASS CLASS MIN CLASS MAX TMEM RESETTING TIME
Table 2 tu 5E 3s 5s 5 min
f 10E 5s 10s 10 min
t
20E 10s 20s 20 min
t 30E 20s 30s 33 min
Iu I
R Protection against rotor blockage
t Iuc tu This protects the motor in two different ways, depending on whether the fault occurs on startup or
f
tuc during normal operation. The behavior in the two operating conditions is defined by the Standard IEC
Ij/Is f 947-4-1 in Annex 2. In the first case (Jam), the operation of the R function protects the motor against
t rotor jamming during normal operation. The R (Jam) protection function works in conjunction with the L
ti/tj protection to ensure that the motor start-up phase is completed. The R (Jam) protection is inhibited
t f during the start-up phase for the same time as the minimum time in the selected overload protection trip
Iuc
class. Once this time has elapsed, the R protection is activated and causes the circuit-breaker to trip if
t I7 tuc the current remains above the current threshold setting (I5) for longer than the time (t5) setting of the
f protection. In the second case (Stall), the protection is designed to operate to protect the motor against
t7 rotor jamming upon start-up. If activated, the R (Stall) protection is not inhibited during start-up and
Iu f
t causes the circuit-breaker to open if the current remains above the current threshold setting (I8) for
tu longer than the time setting (t8) of that protection. The protection has a “start-up” stage from the
t f moment the current exceeds 0.25xIn to the moment the minimum time of the selected trip class is
I7 reached.
t PT100
t7
f
f
Iuc
t
tuc
Ekip M Touch LRIU f
PT100
t f

Contactor
I7
Ekip M Touch LRIU
t7
f

t
Contactor

PT100

f

Ekip M Touch LRIU

Contactor