Page 79 - SACE Tmax XT - Catalogue

Distorted waveform:
Base + 3rd Harmonic
240 V
Distorted waveform:
Distorted waveform:
0 V
Base + 3rd Harmonic
Base + 3rd Harmonic
3rd Harmonic
-240 V
(150 Hertz)
240 V
240 V
Base Sine Waveform
0 V
(50 Hertz)
0 V
Distorted waveform:
Distorted waveform:
Base + 3rd Harmonic
3rd Harmonic
Base + 3rd Harmonic
3rd Harmonic
-240 V
-240 V
(150 Hertz)
(150 Hertz)
240 V
240 V
Base Sine Waveform
Base Sine Waveform
(50 Hertz)
(50 Hertz)
0 V
0 V
3rd Harmonic
Set B
3rd Harmonic
-240 V
(150 Hertz)
-240 V
(150 Hertz)
Base Sine Waveform
Set A
Base Sine Waveform
(50 Hertz)
(50 Hertz)
Set B
Set B
Set A PROTECTION TRIP UNITS 3/45
Trigger event
Set A
Set B
Set B
t Trigger event
Trigger event
IEC 60947-4-1
Set A
Set A Table 2
t t IEC 60947-4-1
Trigger event
IEC 60947-4-1
Trigger event
Table 2
Table 2
t t IEC 60947-4-1 I
IEC 60947-4-1
Table 2
Table 2
t
I I
t t Ij/Is
I I
ti/tj
t t Ij/Is f
Ij/Is
ti/tj 03
ti/tj
Ij/Is f f U Protection against phase loss and/or unbalance
Ij/Is
t
ti/tj This can be implemented when the motor must be promptly protected owing to the absence of a phase.
ti/tj
f The protection trips if the r.m.s. value of at least one of the phase currents drops below the level equal
t t Iu f to 0.1 times the rated current of the trip unit and a second phase exceeds 0.25 times the rated current.
The circuit-breaker is opened if the current value fails to rise above this level within 2 sec. During
tu
t t Iu Iu f start-up, the tripping time of the protection is the lowest value between 2 sec or half the minimum time
of the start-up class. The protection has a “start-up” stage starting from the moment the current
tu tu exceeds 0.25xIn to the moment the minimum time of the selected trip class is reached.
t Iu f f
Iu
tu Uc Undercurrent protection
tu
t t Iuc f f
This function protects the motor from operating in conditions where the load is reduced or null.
tuc The circuit-breaker is opened if all the phases remain below the threshold setting I9 for delay-time t9.
t t Iuc f The protection has a “start-up” stage from the moment the current exceeds 0.25xIn to the moment the
Iuc
tuc minimum time of the selected trip class is reached.
tuc
Iuc f f
t Iuc
tuc IU Protection against phase unbalance
tuc
t t I7 f f This unit is used when a motor needs to be protected against differences in the currents circulating in
t7 the phases. Threshold setting I7 defines the maximum level of difference between each phase and the
t t I7 I7 f mean value of the three phases. If a phase differs more than its set level from the mean value, the pro-
tection opens the circuit-breaker once its time-delay setting (t7) has elapsed. The protection is acti-
t7 t7
t I7 f f vated only if all three phase currents exceed 0.25xI1. During the start-up phase, the tripping time is the
I7
lowest value between t7 or half the minimum time of the start-up class. The protection has a “start-up”
t7 stage from the moment the current exceeds 0.25xIn to when the minimum time of the selected trip
t7
t t PT100 f f class is reached.
PTC Temperature protection
t t PT100 f In its initial configuration, this trip unit is set up to receive an incoming signal from a PTC sensor in-
PT100
stalled on the motor. The operating thresholds of the protection are defined in accordance with the
PT100 f f Standard IEC 60947-8. If the threshold is exceeded, the trip unit opens the circuit-breaker after a 1 sec
PT100
Ekip M Touch LRIU
time-delay.
Ekip M Touch LRIU f f
Ekip M Touch LRIU
Ekip CI Contactor Interface for motor protection
Contactor
Ekip M Touch LRIU
Ekip M Touch LRIU The breaking capacity of a contactor is definitely lower than a circuit-breaker, but with a number of
possible operations consistently higher than those of the breaker (approx. 1,000,000): motor protec-
Contactor
Contactor
tion and operation are thus optimized when these two devices are used in conjunction with each other.
In its initial configuration, the trip unit is set for operation in Normal mode, activating the contactor by
Contactor means of the Ekip CI module if one of the protections trip (with the exception of protections I and G).
Contactor
If the configuration is changed from Normal to Heavy, the trip unit opens the circuit-breaker directly
without transmitting the command to the contactor. An auto-reset function allows the actuation sta-
tus of the Ekip CI to reset automatically after the contactor has tripped owing to the L function, once
an adjustable time from 1 to 1000s has elapsed. Auto-reset can occur only in Normal mode. A BACK UP
function is also available and deals with situations where an opening command transmitted to the con-
tactor via module Ekip CI has not been successful. In this case, the EKIP M Touch LRIU trip unit sends an
opening command to the circuit-breaker after waiting for the set time Tx. The actuation time of the con-
tactor given by the manufacturer must be considered when the time-delay setting Tx is entered.
The function is active with an auxiliary supply.