49
7.22 Miscellaneous Block - Thresholds
The threshold block can be used to monitor the level of an internal parameter. A threshold can then
be set to select between two setpoints. The threshold block contains two identical threshold
detectors designated A and B.
Input (177, 183)
The value of the internal parameter that serves as the control for the switch. An input or
internal link must be used to connect the desired parameter to this input.
Threshold (178, 184)
The level of the
Input
where the switch
activates.
Hysteresis (179, 185)
Provides a hysteresis level that the
Input
must exceed or fall below.
Greater Than (181, 187)
When the
Input
is greater than the
Threshold
, this value is sent to the
Output
.
Less Than or Equal (180, 186)
When the
Input
is less than or equal to the
Threshold
, this value is sent to the
Output
.
Output (182, 188, Read-Only)
Contains either the
Greater Than
or
Less Than or Equal
values depending on the
comparison between the
Input
and the
Threshold
.
Example - Thresholds
Setup the threshold block to monitor analog input 3. The analog signal ranges from 0.0 to
10.0 Volts and should switch the velocity loop gain schedule when it reaches 6.0 volts.
1. While the drive is stopped, go to Setup|Programming|Inputs|Analog|Analog Input
2. Set the
Analog Input 3 Destination
to
Input A
(177). All other Analog Input 3 parameters
are assumed to be set to the factory settings.
3. Go to the Threshold section under Miscellaneous.
4. Set
Threshold A
to 60.00% (6 Volts is 60% of 10 Volts)
5. Set
Hysteresis A
to 5.00%.
6. Set
Greater Than A
to 0.01% (True).
7. Set
Less Than or Equal A
to 0.00% (False).
8. Go to the Internal Links section under Miscellaneous.
9. Set
Internal Link 10 Source
to
Output A
(182).
10. Set Internal Link 10 Destination to
Velocity Gain Select
(203).
The 0 to 10 Volt signal at Analog Input 3 is converted to a 0 to 100.00% value by the analog input.
This value is sent to
Input A
and compared to the
Threshold A
level of 60.00%. When the signal
starts out, it is below the threshold level and the
Output A
is equal to the
Less Than or Equal
setting of 0.00%. The Internal Link copies this value to the
Velocity Gain Select
parameter. When
the signal level exceeds 60.00% (6 Volts), the
Greater Than
value (0.01%) is copied to
Output A
.
The Internal Link copies the
Output A
value to the
Velocity Gain Select
parameter. The 0.01%
value is interpreted by the
Velocity Gain Select
as a 1 and the velocity loop uses
Velocity Gain Set
B
.
Figure 40
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