Page 73 - SACE Tmax XT - Catalogue

t
I7
t7
t
steady
t
state
start-up
I7
t7 I
I I PROTECTION TRIP UNITS 3/39
t t 100% 200%
steady
50% 150%
state L start-up
S
I
I I
t t 100% 200%
50% 150%
L
I4 S
t4
I
I I 03
MCR – Closing on Short-circuit
t
t This protection uses the same algorithm as the l protection, limiting the operation to a settable time
I3 window starting from the closing of the circuit-breaker. The protection can be disabled, when needed.
I4 The function is active with an auxiliary supply.
t4
I
I
t t Iinst
This guarantees the integrity of the circuit-breaker and installation in the case of particularly high current
I3 values requiring shorter reaction times than those provided by the instantaneous short-circuit
I2
t2 protection. The protection cannot be disabled, and the tripping threshold and time are defined by ABB.

I
I
t t t IU - Current unbalance (ANSI 46)
I1 This function protects against an unbalance between the currents of the single phases protected by
t1
I7 the circuit-breaker.
I2
t2
t7
I I I

t t steady Harmonic distortion
state start-up
I1
Distorted waveform:
Base + 3rd Harmonic This allows a control alarm to be activated for a distorted waveform. If enabled, an alarm is activated
t1
240 V for waveform factors higher than 2.1.
0 V
3rd Harmonic
-240 V
(150 Hertz)
Base Sine Waveform I I
(50 Hertz)
t 100% 200%
50% 150% T - Temperature
L
Set B This protects the circuit-breaker against abnormal temperatures recorded by the unit. It is always active,
S
Set A and has two states, according to the temperature:
I • Warning: -25 < t < -20 or 70 < t < 85 Display off; Warning LED on @ 0.5Hz.
Trigger event I • Alarm: t < -25 o t > 85 Display off; Alarm and Warning LEDs on @2Hz; Circuit-breaker opening command.
Hardware Trip
t t IEC 60947-4-1 This protects against internal disconnections of the circuit-breaker. If enabled, a fault is signaled and
Table 2
an opening command is sent if one or more of the following events are detected:
I4 • Current sensors disconnected (phase or external if enabled)
t4 • Rating plug disconnected (only for XT5 and XT7)
• Trip coil disconnected (only signaling)
I I • Incompatibility between protection release and mainboard (only for XT7)
t t • Internal problems with the release.
Current thresholds
I3
Ij/Is This function enables the realization of four independent thresholds to be indicated to enable correc-
tive actions before the overload L protection trips the circuit-breaker. For example, by disconnecting
ti/tj the loads controlled by an Ekip Signalling device positioned downstream of the circuit-breaker.
f
I
t
t

I2
Iu
t2
tu
I
f
t
t I1
t1
Iuc

tuc
I
f

t

I7
t7
f

t

PT100

f

Ekip M Touch LRIU

Contactor