76 Functional description CG Drives & Automation 01-7318-01r1
11.4.3 Trip Autoreset/Trip
Conditions [
250
]
The benefit of this feature is that occasional trips that do not
affect the process will be automatically reset. Only when the
failure keeps on coming back, recurring at defined times and
therefore cannot be solved by the AFR/AFG drive, will the
unit give an alarm to inform the operator that attention is
required.
Also see section 12.2, page 148.
Autoreset example:
In an application it is known that the main supply voltage
sometimes disappears for a very short time, a so-called “dip”.
That will cause the AC drive to trip an “Undervoltage
alarm”. Using the Autoreset function, this trip will be
acknowledged automatically.
• Enable the Autoreset function by making the reset input
continuously high.
• Activate the Autoreset function in the menu [251],
Number of trips.
• Select in menu [259] Undervoltage the trip conditions
that shall be allowed to be automatically reset by the
Autoreset function, after the set delay time has expired.
Number of Trips [
251
]
Any number set above 0 activates the Autoreset. This means
that after a trip, the AFR/AFG drive will restart
automatically according to the number of attempts selected.
No restart attempts will take place unless all conditions are
normal.
If the Autoreset counter (not visible) contains more trips
than the selected number of attempts, the Autoreset cycle
will be interrupted. No Autoreset will then take place.
If there are no trips for more than 10 minutes, the Autoreset
counter decreases by one.
If the maximum number of trips has been reached, the trip
message hour counter is marked with an “A”. A normal reset
is then required.
Example:
• Number of allowed autoreset attempts [251]= 5.
• Within 10 minutes 6 trips occur.
• At the 6th trip there is no autoreset, because the
autoreset counter is set to allow only 5 attempts to
autoreset a trip.
• To reset the autoreset counter, give a new reset command
(from one of the sources for reset control selected in
menu [216]).
• The autoreset counter is now zeroed.
Over temperature [
252
]
Delay time starts counting when the fault is gone. When the
time delay has elapsed, the alarm will be reset if the function
is active.
Over volt D [
253
]
Delay time starts counting when the fault is gone. When the
time delay has elapsed, the alarm will be reset if the function
is active
.
Default: 0 (no Autoreset)
Range: 0–10 attempts
NOTE:
An auto reset is delayed by the remaining ramp time.
Default: Off
Off 0 Off
1–3600 1–3600 1–3600 s
NOTE: An auto reset is delayed by the remaining
ramp time.
Default: Off
Off 0 Off
1–3600 1–3600 1–3600 s
NOTE:
An auto reset is delayed by the remaining ramp time.
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