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(1) Overload protection
If the UPS output is overloaded by exceeding the current
capacity of the inverter, such as when a computer system
boots up, the output selector automatically switches the
source of AC power from the inverter to the bypass circuit,
without interruption.
After a certain period of time has elapsed, the source of power to the load is switched back to the inverter without
interruption (auto-return), as shown in §17.1(1).
* When "Overload Recovery Operation" in the user setting menu is set to "Bypass", the UPS switches to inverter
power supply without interruption when the overload is resolved.
(2) UPS fault protection
If a fault occurs in the UPS, the output selector activates automatically and switches to bypass power without
interruption. The "Red ALARM" indicator lights, and the alarm buzzer sounds. The power supply route is the same as
for an overload.
Output from the UPS will stop if a power outage occurs during bypass operation due to the UPS fault. Contact your
supplier or SANYO DENKI as soon as possible.
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The following table shows functions and operations which activate to protect the UPS.
Operation panel (front panel) indicators
Item
Green
Green
INPUT
OUTPUT
Preparation
Normal
Serious failure
Overload
(effective value)
Forced bypass
Input over
voltage
Input over
voltage
(prolonged)
Power outage
Power outage
(prolonged)
Input error
(frequency)
Input error
(prolonged)
Battery failure
(*1): Buzzer sound patterns:
① *
② **......**......
③ **********......
④ ****......****...
(*2): In this state, the LED blinks or is off, depending on the setting of "UPS Operation at
setting menu.
When this setting is set to "Bypass"
When this setting is set to "OFF"
(*3): Battery operation. Stops inverter operation when final battery discharge is reached.
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Green
Red
INV.ON
ALARM
STAND BY
(*2)
(*2)
-
-
-
-
-
-
-
-
-
-
Continuous tone
Continuous beeps
:
: -
Utility
power
Rectifier
b
l
e
b
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e
Alarms
Red
Buzzer
Red
BATT.
(*1)
(UPS operations)
O.L
LOW
Rectifier, charger,
-
-
-
operation
Inverter operation
-
-
-
Stop inverter
①
-
-
Bypass supply
④
-
Bypass supply
-
-
-
②
-
-
③
-
Stop rectifier and
②
-
-
charger
Inverter operation
③
-
②
-
-
③
-
Stop inverter
①
-
Bypass supply
Press
Characteristics
Inverter
Converter
Charger
Batteries
Indication of the marks in the table
are as follows.
Lit LED :
Blinking LED :
Buzzer Alarm : ① - ④
Protective
functions
Notes
Power up
Power up,
operation
Auto return
Manual switch
to bypass supply
Battery operation
Battery operation
(*3)
Battery operation
Battery operation
(*3)
Battery operation
Battery operation
(*3)
Pit
to stop the buzzer.
OFF" in the user
Output
66
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