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4.7.4.1 Ext Speed Limit (min):
The
Ext Speed Limit (min)
is a percentage of the minimum speed of the variable speed motor. This is
used to set the minimum speed limit when the programmable digital input function for External Speed
Limit is active. This can only be used to increase the minimum speed above the allowable minimum
speed for the machine for a given operating point. For example, if the allowable minimum speed is 21%
for a given machine at the current pressure and the Ext Sped Limit (min) is set to 30%, the machine
would not be allowed to modulate the speed below 30% when the External Speed Limit input was active.
If the Ext Speed Limit (min) is set to 15% on this same machine, the machine would still not be allowed to
run below its minimum of 21% regardless of the state of the input.
Figure 152: Ext Speed Limit (min)
4.7.4.2 Ext Speed Limit (max):
The
Ext Speed Limit (max)
is a percentage of the maximum speed of the variable speed motor. This
setting is used to set the maximum speed limit when the programmable digital input function for External
Speed Limit is active> This can only be used to decrease the maximum speed above the allowable
maximum speed for the machine for a given operating point.
