Rev. 07
24/138
4.7.1. Thermal image measurement evolution graphic
On next graphic, thermal image measurement evolution can be observed depending on
applied current:
Supposing that thermal image protection has an adjusted tap of 1,1 times the nominal current and an
alarm level of 75%:
•
Zone 1: The machine is de-energized for a long time. Thermal image is 0%.
•
Zone 2: The machine is supplied with the nominal current. Thermal image evolutions so as to
get the value of the thermal balance corresponding to one time the nominal current Th = (I/It)
2
= 82%. The time that it takes in getting the thermal balance depends on the adjusted heating
constant.
•
Zone 3: Once reached the thermal image corresponding to the application of one time the
nominal current, it is applied 1,2 times the nominal current. Thermal image would evolve so as
to get the thermal balance corresponding to 1,2 times the nominal current Th = (I/It)
2
= 119%.
This would occur if the Function Enable of the thermal function is disabled. If the Function
Enable is disabled, 49 protection function performs when the thermal image reaches the value
of 100%. Once tripped, current is cut and thermal image is getting cool based on the cooling
constant.
•
Zone 4: Before getting totally cool, nominal current is applied again and thermal balance is
reached once passed the time determined by the heating thermal constant.
The accuracy of the trip time is the theoretical trip time is ±5% of the theoretical time.
Thermal image protection alarm bit is active if the thermal image measurement is over the adjusted
alarm level and it is reset when the thermal image value is below the 95% of the set alarm.
Thermal image protection trip bit is active when the measurement of the thermal image is over 100%.
and it is reset when the measurement of the thermal image is under 100%.
4.7.2. Thermal image with memory
Thermal image is stored in non-volatile RAM memory periodically. By this way, though the relay loses
the power supply, it will keep the thermal state of the machine.
4.7.3. Thermal image measurement display. Reset
.
Thermal image measurement can be displayed on Measurement menu.
Th %
t
100%
1
2
3
4
75%
alarm
trip
Summary of Contents for SIA-B Series
Page 8: ...www fanox com Rev 07 8 138 Cut out pattern 2 3 Striker dimensions 2 3 1 PRT 15...
Page 9: ...www fanox com Rev 07 9 138 2 3 2 PRT A 44 5 B 49 5 C 56 5 D 64 5 E 42 5...
Page 10: ...www fanox com Rev 07 10 138 2 4 Connection diagram NOTE STRIKER 6 24 Vdc 0 135 W s...
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