CG Drives & Automation, 01-5980-01r2 Functionality 101
Minimum Alarm Delay [4143]
When the load level falls below the alarm level for a
continuous period longer than the set “Min Alarm Delay”
time, the selected “Minimum Alarm Action” in menu [4141]
is activated.
Start Delay [416]
This setting can be used to e.g. override an alarm during the
start-up procedure. The selected time will delay the
activation of the load monitor alarms after the run command.
Autoset [417]
This is an alternative procedure to set up the alarm levels
automatically which is based on the shaft power level at the
moment of the “Autoset”.
When autoset is performed, the actual value of the shaft
power is stored to menu [4176] Normal Load. The alarm
levels are then recalculated as follows:
After performing autoset, you can view the actual alarm level
settings in menus [4112], [4122], [4132], and [4142].
The alarm actions for all load monitor alarms, both manual
and autoset, are configured in menus [4111], [4121], [4131],
and [4141]; and the corresponding alarm delays are set in
menus [4113], [4123], [4133], and [4143].
Autoset is also available via digital input [520].
Maximum Alarm Margin [4171]
This autoset menu sets the band above the Normal Load
[4176] that does not generate a maximum alarm. The set
“Max Alarm Margin” percentage is added on to the
percentage of the “Normal Load”. The resulting percentage
is where the maximum alarm level is put, related to nominal
motor power [223].
Example:
The “Maximum Alarm Margin” is set to 16%. The actual
shaft power at the moment of performing autoset is 45%.
The new maximum alarm will be set to 61%, which means
that the “Maximum Alarm Delay” timer in menu [4113] will
start counting down when the actual shaft power exceeds
61% (equal to 61% of the nominal motor power [223]).
When the alarm delay time has elapsed, a maximum alarm
could be generated, depending on the setting in menu [4111]
Max Alarm Action.
Maximum Pre-Alarm Margin [4172]
This autoset menu sets the band above the Normal Load
[4176] that does not generate a maximum pre-alarm. The set
Max Pre-Alarm Margin percentage is added on to the
percentage of the “Normal Load”. The resulting percentage
is where the maximum pre-alarm level is put, related to
nominal motor power [223].
Default: 0.5 s
Range: 0.1 - 90 s
Default: 10 s
Range: 1 - 999 s
NOTE: If you have manually configured the alarm levels
in menus [4112], [4122], [4132], and [4142], you do not
need to do any settings in this menu or its sub-menus.
Table 28 Load monitor alarm levels
Alarm Level Calculation
Overload
[4112] MaxAlarmLev
[4176] Normal Load +
[4171] MaxAlarmMar
[4122] MaxPreAlLev
[4176] Normal Load +
[4172] MaxPreAlMar
Underload
[4132] MinPreAlLev
[4176] Normal Load -
[4173] MinPreAlMar
[4142] MinAlarmLev
[4176] Normal Load -
[4174] MinAlarmMar
NOTE: Changing any alarm margin without performing
Autoset will NOT affect the alarm levels.
NOTE: A manual change of any alarm level will override
the last performed autoset, and menu [4176] Normal
Load will be set to “Off”.
NOTE: Changing any margin without performing autoset
will NOT affect the alarm levels.
Default: 16%
Range: 0–100% of nominal motor power [223]
Default: 8%
Range: 0 - of nominal motor power [223]
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