81
Overload protection setting (F-03):
In this parameter, set a reference current value for the overload protection assuming that the rated motor
armature current (A-04) or VF66B (DC motor drive) output allowable current whichever is smaller is 100%.
When an rms of VF66B (DC motor drive) output current exceeds 105% of this reference current, this is
considered as an overload situation, and the overload protection counter starts. As shown in the figure, an
overload protection (oL) will be activated according to the 150% - 60 sec characteristic curve.
Overload protection (oL) operation time
* The overload protection counter can be monitored via
the console panel (SET66-Z).
The overload counter performs counting over time in
the overload situation. When it reaches 100%, the
overload protection is activated to perform protective
detection.
You can also use an overload pre-alarm function to
output signals when the overload counter exceeds a
desired point. (Refer to "6.9. Area H" in Chapter 6
and "7.9. Area H" in Chapter 7.)
Cumulative operation timer setting
Console
panel
monitor
display
Contents
Setting range (selecting item)
Setting
resolution
Initialized
data
Unit
F-04
Cumulative operation timer (1)
(Main circuit capacitor life)
0 to 65535
1
43800
Hr
F-05
Cumulative operation timer (2)
(Cooling fan life)
0 to 65535
1
21900
Hr
Cumulative operation time is cumulative operation timer (1) (F-04), cumulative operation timer (2) (F-05):
VF66B (DC motor drive) counts cumulative operation time in hour. When the cumulative operation time
exceeds one of the setting values of the cumulative operation timer (1) (F-04) and cooling operation timer (2)
(F-05), the "ALM" LED on the console panel (SET66-Z) turns on. Use this as a guideline for maintenance and
inspection of VF66B (DC motor drive).
When the cumulative operation timers are not changed from the initialized data, the cumulative operation
timer (1) (F-04) and cumulative operation timer (2) (F-05) represent the approximate lives of the capacitor and
the cooling fan, respectively.
When the value of the timer remaining time 1 of the monitor display item becomes 0 or less, this indicates that
it is time to replace the capacitor and that replacement of the capacitor is recommended.
When the value of the timer remaining time 2 becomes 0 or less, this indicates that it is time to replace the
cooling fan and that replacement of the cooling fan is recommended.
Motor overheating protection setting
Console
panel
monitor
display
Contents
Setting range (selecting item)
Setting
resolution
Initialized
data
Unit
F-06
Motor overheat protection operation
selection
oFF (Without protection operation)
on (With protection operation)
- oFF
-
oL protection operation time (sec)
Rms output current
(Percentage to reference current
(A-04×F-03/100))
105
150
60
200
400
oL operation time
＝
2700/(output current (percentage to
reference current) - 105)
%
