sh030106u.pdf - 第256页
7. SPEC IAL ADJUSTMEN T FUNCT IONS 7 - 27 (1) Instantaneous po wer fail ure time of th e control c ircuit power s upply > [ Pr. PF25 SEMI-F47 fu nction - Instantane ous po wer fail ure detec tion t ime] The alarm occu…
7. SPECIAL ADJUSTMENT FUNCTIONS
7 - 26
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 servo amplifier 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.
POINT
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 servo amplifier 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].
The external dynamic brake cannot be used for compliance with SEMI-F47
standard. Do not assign DB (Dynamic brake interlock) in [Pr. PD07] to [Pr.
PD09]. Failure to do so will cause the servo amplifier to become servo-off when
an instantaneous power failure occurs.
The setting range of [Pr. PF25 SEMI-F47 function - Instantaneous power failure
detection time] differs depending on the software version of the servo amplifier
as follows.
Software version C0 or later: Setting range 30 ms to 200 ms
Software version C1 or earlier: Setting range 30 ms to 500 ms
To comply with SEMI-F47 standard, it is unnecessary to change the initial value
(200 ms).
When the instantaneous power failure time exceeds 200 ms, and if the
instantaneous power failure voltage is less than 70 % of the rated input voltage,
the power may be turned off normally even if a value larger than 200 ms is set in
the parameter.
7. SPECIAL ADJUSTMENT FUNCTIONS
7 - 27
(1) Instantaneous power failure time of the control circuit power supply > [Pr. PF25 SEMI-F47 function -
Instantaneous power failure detection time]
The alarm occurs when the instantaneous power failure time of the control circuit power supply exceeds
[Pr. PF25 SEMI-F47 function - Instantaneous power failure detection time].
MTTR (During tough drive) turns on after detecting the instantaneous power failure.
MBR (Electromagnetic brake interlock) turns off when the alarm occurs.
Control circuit
power supply
Bus voltage
Undervoltage level
(Note)
A
LM
(Malfunction)
[Pr. PF25]
Instantaneous power failure time of the control circuit power supply
MTTR
(During tough drive)
MBR
(Electromagnetic
brake interlock)
Base circuit
ON
OFF
ON (energization)
OFF (power failure)
ON
OFF
W
NG
(Warning)
ON
OFF
ON
OFF
ON
OFF
Note. Refer to table 7.1 for the undervolta
g
e level.
7. SPECIAL ADJUSTMENT FUNCTIONS
7 - 28
(2) Instantaneous power failure time of the control circuit power supply < [Pr. PF25 SEMI-F47 function -
Instantaneous power failure detection time]
Operation status differs depending on how bus voltage decrease.
(a) When the bus voltage decrease lower than Undervoltage level within the instantaneous power failure
time of the control circuit power supply
[AL. 10 Undervoltage] occurs when the bus voltage decrease lower than Undervoltage level
regardless of the enabled instantaneous power failure tough drive.
[Pr. PF25]
Instantaneous power failure time of the control circuit power supply
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Control circuit
power suppl
y
Bus voltage
Undervoltage level
(Note)
A
LM
(Malfunction)
MTTR
(During tough drive)
MBR
(Electromagnetic
brake interlock)
Base circuit
W
NG
(Warning)
ON (energization)
OFF (power failure)
Note. Refer to table 7.1 for the undervolta
g
e level.