7. SPECIAL ADJUSTMENT FUNCTIONS
7 - 25
7.3.2 Instantaneous power failure tough drive function
The instantaneous power failure tough drive function avoids [AL. 10 Undervoltage] even when an
instantaneous power failure occurs during operation. When the instantaneous power failure tough drive
activates, the function will increase the tolerance against instantaneous power failure using the electrical
energy charged in the capacitor in the driver and will change an alarm level of [AL. 10 Undervoltage]
simultaneously. The [AL. 10.1 Voltage drop in the control circuit power] detection time for the control circuit
power supply can be changed by [Pr. PF25 SEMI-F47 function - Instantaneous power failure detection time].
In addition, [AL. 10.2 Voltage drop in the main circuit power] detection level for the bus voltage is changed
automatically.
MBR (Electromagnetic brake interlock) will not turn off during the instantaneous
power failure tough drive.
When selecting "Enabled (_ _ _ 1)" for "Torque limit function selection at
instantaneous power failure" in [Pr. PA26], if an instantaneous power failure
occurs during operation, you can save electric energy charged in the capacitor in
the driver by limiting torque at acceleration. You can also delay the time until the
occurrence of [AL. 10.2 Voltage drop in the main circuit power]. Doing this will
enable you to set a longer time in [Pr. PF25 SEMI-F47 function - Instantaneous
power failure detection time].
When the load of instantaneous power failure is large, [AL. 10.2] caused by the
bus voltage drop may occur regardless of the set value of [Pr. PF25 SEMI-F47
function - Instantaneous power failure detection time].
To comply with SEMI-F47 standard, it is unnecessary to change the initial value
(200 ms) in [Pr. PF25 SEMI-F47 function - Instantaneous power failure detection
time]. When the instantaneous power failure time exceeds 200 ms, and the
instantaneous power failure voltage is less than 70% of the rated input voltage,
the power may be normally turned off even if a value larger than 200 ms is set in
the parameter.
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