Vonsch Quatrofrem Series, Конфигурация и диагностика

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UNIFREM v.3.41x
10 May 2017 Page 153 from 180
These displayed quantities serve for OPS diagnosis and evaluation: lifting functions
Load 854 Drive load rate evaluated from the signal Load. signal (ID 843) and
related to 100 % Load (ID 844). [%]
Short commands
count 855 Number of forbidden short command sequences. After exceeding
the short commands count, the overload switch will switch on
regardless of the drive load. Short commands evaluation can be
turned off by the parameter
(ID 842).
OPS status 856 Indicates the status of the Overload switch block.
An example of a diagnostic variable OPS status
Overload of the drive will appear:
•
If terms of formation of overload are met during operation. If the mode (ID 842) „only static
mode“ is inactive during dynamic operation, when the „Load“ exceeds the value of
parameter „Dynamic overload“ (ID 845) for the time longer as „Dynamic overload period“
(ID 848). Similarly, if the "Load" exceeds the static limit for the corresponding time in the
static mode.
•
Or if is mode (ID 842) „test short commands“ turned on and number of short commands
in counter of short commands exceeds 5 short commands within 5 min.
Converter signalises status of overload also with functional message
F36-OPS switched on . on
the display of control panel.
Overload of the drive will disappear:
If the "load" falls below the value of the parameter „Overload turn off“ (ID 847) in the reverse
operation mode for the period longer as „Overload period turn off“ (ID 850).
In OPS mode (ID 842), it is possible to choose the function
„slow abseil“ . This function limits the
speed to 20% in the reverse operation at overload to increase safety when handling excessive
loads.
Then in the modes it is also possible to disable the internal blocking of drive start in the positive
direction with the choice
„does not generate STOP“ , in cases, when only signalisation or the
other action should be executed at overload (for example, the speed or torque restriction). The
other actions are adjusted by using universal control blocks of converter.
Limits autodetection:
One of the new OPS modes (ID 842) is
„ autodetect limits“ . Limits of overload conditions are
reset after turning on this mode (ID 845, ID 846, ID 847) and during the following working cycles of
the device, the limit values of parameter "Overload" are automatically detected.
The drive should be loaded with maximum safe load at this detection. (maximum permissible
weight, etc). The values of limits will probably settled after 5 to 10 cycles and will stabilize at the
levels that are little above the maximum working load. After turning off this mode, detected limits
will remain at the new values and OPS is working within them.
Converter generates function message F37-
Overload detection during „autodetect limits“.