Section 10 Protections - SamplexPower PST-1500-12 Mode D'emploi

SECTION 10 |
Power Surge Condition, PST-1500: the surge rating is 3000W or 25A (3000W ÷ 120VAC=
25A). When the instantaneous value of the AC output current tries to exceed the above
value of 25A, output current limiting is initiated that clamps the peak instantaneous value
of output current at 25A. Output current limiting results in drop in the peak portion of
the AC output voltage waveform and hence, the RMS voltage also drops. The extent of
voltage drop is proportional to the rated surge current of the load minus 25A. Hence,
higher surge current of the load will produce higher voltage drop. For example, consider-
ing resistive load with Power Factor =1 (voltage and current are in phase), current limiting
will occur near the peak portion of the voltage waveform during every half cycle (half
cycle lasts for 8.33 msec at 60Hz). 3000W is the value of surge power averaged over 1 to 2
msec during every half cycle of 8.33msec. If this situation continues for 2 to 2.5 sec, over-
load condition is activated and the AC output is shut down.
Power surge condition, PST-2000: the surge rating is 3500W or 29.17A (3500W ÷ 120VAC=
29.17A). When the instantaneous value of the ac output current tries to exceed the above
value of 29.17A, output current limiting is initiated that clamps the peak instantaneous
value of output current at 29.17A. Output current limiting results in drop in the peak por-
tion of the ac output voltage waveform and hence, the RMS voltage also drops. The ex-
tent of voltage drop is proportional to the rated surge current of the load minus 29.17A.
Hence, higher surge current of the load will produce higher voltage drop. For example,
considering resistive load with Power Factor =1 (voltage and current are in phase), current
limiting will occur near the peak portion of the voltage waveform during every half cycle
(half cycle lasts for 8.33 msec at 60Hz). 3500W is the value of surge power averaged over
1 to 2 msec during every half cycle of 8.33msec. If this situation continues for 2 to 2.5 sec,
overload condition is activated and the ac output is shut down.
Overload Condition: If there is a continuous overload of 110% to 115% for 2 to 2.5 sec,
the output voltage will be shut down. Red LED marked "OVERLOAD" (3, Fig 6.1) will turn
ON, the Green indication light on the GFCI outlet will be OFF and buzzer alarm will sound.
The Green LED marked "POWER" (2, Fig 6.1) will continue to be lighted. The unit will be
latched in this shut down condition and will require manual reset. To reset, switch OFF the
unit using the ON/OFF Switch (1, Fig 6.1), wait for 3 minutes and then switch ON the unit
again. Before switching ON, determine and remove the cause of overloading.
Short Circuit Condition: Short circuit condition will be detected when the AC output
voltage drops to 80VAC or lower over a period of around 1 to 1.5 sec. The AC output
voltage will be shut down thereafter.
Red LED marked "OVERLOAD" (3, Fig 6.1) will turn ON, the Green indication light
on the GFCI outlet will be OFF and buzzer alarm will sound. The Green LED marked
"POWER" (2, Fig 6.1) will continue to be lighted. The unit will be latched in this shut
down condition and will require manual reset. To reset, switch OFF the unit using the
ON/OFF Switch (1, Fig 6.1), wait for 3 minutes and then switch ON the unit again. Before
switching ON, determine and remove the cause of short circuit.
42 | SAMLEX AMERICA INC.
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