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7 Using the I/O signal functions
7-1
I/O signal functions
About contact signal
You can develop your unique system based on the following specifications to automate the process
at a power failure. You can perform power-failure processing by allowing the system to detect the
backup signal (BU) and also perform system shutdown processing by allowing the system to detect
the low battery level signal (BL). Also, by inputting the backup stop signal (BS) from the system, you
can stop the UPS with a sufficient battery level to prepare for the next occurrence of a power failure.
7-1-1
Type of output signals
The UPS has 4 kinds of output signals.
The output circuit consists of an open collector circuit using a photo coupler.
Backup signal output (BU)
Low battery level signal output (BL)
Trouble signal output (TR)
Battery replacement signal output (WB)
7-1-2
Type of input signals
The UPS has 2 kinds of input signals.
UPS Stop Signal input (BS)
Remote ON/OFF signal
*1. BS signal delay time
It is possible to set the period of time from when a BS signal is received until the output of the UPS is stopped.
The output of the UPS can be stopped by inputting the voltage signal (High).
7 - 2
Signal
Signal
S8BA-series Uninterruptible Power Supply (UPS) User's Manual (U726)
Description
Stays ON during backup operation at a power failure.
Goes ON when the battery becomes weak during
backup operation at a power failure.
Goes ON when an internal failure of the UPS occurs or
when the battery life counter expires.
Goes ON when it is detected that the battery lifespan
has expired or the battery has deteriorated. (The bat-
tery life counter goes on counting till the time the input
power is being supplied.)
Description
When the BS signal is ON (High), the output of the
UPS is stopped after the time period specified in
*1
advance has elapsed
.
Remote ON/OFF signals can be used to start and stop
the UPS, by using either an externally connected con-
tact or the ON/OFF status of the open collector circuit.
When signal is OFF, the UPS will be turned on. When
signal is ON, the UPS will be turned off.
In the factory settings, the UPS stops operation when
this is short-circuited.
You must connect the unit to the input power supply to
be able to use this function.
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