Yaskawa MP920 User's Manual Design - Manual (Page 483)

11.3 Absolute Encoder Battery
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• One of the lithium battery characteristics is that battery voltage sharply declines once a voltage
drop starts. The battery should therefore be replaced as soon as possible (within a week after the
ALARM1 indicator lights up).
• The Battery Module retains the indicator and output signal statuses until the power is turned OFF
or the next voltage check is performed.
„ Lithium Battery Voltage Measurement Reporting Function
The Battery Module uses an indicator and output signal to externally report the lithium bat-
tery voltage check currently in progress. The table below shows the relationship between
operating status, indicators, and output signals.
• The Battery Module performs a lithium battery voltage check sequence when the power is turned
ON, when battery voltage check signal CHK is turned ON for 1 ms or more, or when the battery
voltage check switch is pressed.
• If battery voltage check signal CHK is left ON, or the battery voltage check switch is held down,
the POWER indicator will remain not lit and the PON output signal will remain OFF.
• Input the battery voltage check signal CHK as a pulse signal. Do not hold down the battery voltage
check switch.
Operating Status, Indicators, and Output Signals
Operating Status Indicator Output
Signal
Remarks
External power supply
ON “POWER” lit “PON” ON
External power supply
OFF or battery volt-
age check in progress “POWER” not
lit “PON”
OFF The states of ALARM1 and
ALARM2 indicators, and the
states of ALM1 and ALM2 out-
put signals are indeterminate.
IMPORTANT
IMPORTANT