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UPS
Uninterruptible Power System
SKP-500A/700A
SERVICE’S MANUAL
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(1) PANELS EXPLAIN
Front Panel
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“ON/TEST” button:
With the UPS plugged in, press the ON/TEST button to turn on the UPS
and power the loads. ON/TEST button also activates the UPS‘s self-test function and silence the
buzzer when working at backup mode.
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“OFF” button:
Press the OFF button to turn off the UPS and the loads.
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“BOOST AVR (VOLTAGE BOOST)” indicator (YELLOW LED):
The LED illuminates
when the UPS is correcting a lower utility voltage input. The loads would receive steady and
correct power from the UPS.
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“BUCK AVR (VOLTAGE REDUCTION)” indicator (YELLOW LED):
The LED
illuminates when the UPS is correcting a higher utility voltage input. The loads would receive
steady power from UPS.
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“OVERLOAD / REPLACE BATTERY” indicator (RED LED):
The LED flashes when the
loads connected to the UPS exceed the UPS‘s capacity, and bright steady when the UPS‘s battery is
no longer useful and must be replaced..
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“BACK UP” indicator (YELLOW LED):
The LED illuminates when the UPS is supplying
battery power to the loads
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“LINE NORMAL” indicator (GREEN LED):
The LED illuminate when the line input
voltage is normal.
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“LOAD LEVEL / BATTERY CAPACITY” bar graph:
When line normal, the LED bar
shows the load level. When back up mode, it shows the battery capacity.
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Rear Panel
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REMOTE PORT
Provide both RS-232 and relay signal or USB to support NOVELL, UNIX, DOS, WINDOWS and
other operating systems.
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TEL./MODEM protection
Telecom transfer ports provide users to extend the applications.
Caution:
To reduce the risk of fire, use only No. 26AWG or larger telecommunication line cord.
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AC INPUT POWER RECEPTACLE
The input power cord needs to connect the rear inlet socket of the UPS and plug into a socket on
the wall. Please notice the voltage of utility power should match with the UPS. For example, the
rating voltage of UPS is 110V/(220V), the input utility power should be the same as 110V/(220V).
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INPUT CIRCUIT BREAKER/ FUSE
It trips when the connected loads exceed the protected receptacle‘s capacity. The center plungers of
the circuit breakers/ fuse enabled when tripped.
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UPS OUTLETS
When utility power is normal, the UPS outlets are powered by utility power without AVR function.
Any higher or lower utility power would be rectified by AVR function. When utility power is fail,
the UPS outlets are powered from battery.
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CONVENIENCE OUTLET
The CONVENIENCE outlet is pass from the utility power with voltage spike filtering function.
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(2)MAIN STRUCTURES OF SMK-500CS/700CS
SKP-500A SKP-700A MODEL NAME
100~120V 220~240V 100~120V 220~240V
PCB S505-V1.x
CPU S505-V1.xx
TRANSFORMER RT-S05A1 RT-S05B1 RT-S07A1 RT-S07B1
BATTERY 12V/7AH 12V/9AH
REAL PANEL INPUT SOCKET,OUTPUT SOKETS
FRONT PANEL STATUS LED,POWER SWITCH
(3)THE ATTACHED CONNETION DIAGRAMS OF SMK-500CS/700CS
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(4)FUNCTION BLOCK DIAGRAM
4.1 Main structure
4.2 Control circuit
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(5)TROUBLE SHOOTING FOT SKP-500A/700A SERIES:
PROBLEM POSSIBLE CAUSE ACTION TO TAKE
“On” switch not been push Push the “On” switch
Battery voltage less than 10V Connect the utility power to the ups and test
after 8hours.
UPS not on &
LED not light
PCB failure Replace the PCB, call for service
AC FUSE or Circuit breaker open Replace the AC fuse in the inlet, or re-push
the circuit breaker.
UPS always at
battery mode
Line voltage too high, too low or black
out
Normal condition
Battery not fully charged Recharge the UPS at least 8 hours
Battery too old Replace Battery, call for service
Back up time too
short
PCB failure Replace PCB, call for service
Buzzer continuous
beeping
Overload Remove the non-critical loads
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