Curtis 1229 handleiding
Handleiding
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3 — I/O MAPPING
1229 Manual - OS 1.8 RevA - May 2021
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pg. 34
Example 6: Use of the Map functions
A vehicle is congured as in Example 5, with Driver 3 running a pump from Switch 4 at 100%
duty cycle, when the vehicle is running forward at greater than 5% speed. Now we will modify this
mapping so that the pump will run at a duty cycle proportional to forward speed, such that duty
cycle is 0% when the vehicle is running at less than 5% forward speed, is 25% when the vehicle is
at 5% forward speed, and ramps to 100% when the vehicle is at 30% forward speed, and remains at
100% for speeds above 30%.
1-Switch 1
On Delay = 0.1 s
Off Delay = 0.1 s
Normally Closed = Off
40-Vehicle Speed
4-Switch 4
On Delay = 0.1 s
Off Delay = 0.1 s
Normally Closed = Off
54-Map 1
Input = 40
X1 = 0%
Y1 = 0%
X2 = 4%
Y2 = 0%
X3 = 5%
Y3 = 25%
X4 = 100%
Y4 = 100%
X5 = 100%
Y5 = 100%
92-Forward
Input = 1
100-Always On 100%
42-Logic Gate 2
and/or/xor = 1
Input 1 = 92
Input 2 = 4
Input 1- = Off
Input 2- = Off
Output- = Off
73-Slew Limit 1
Input = 54
Enable Input = 42
Rate Up = 0.5 s
Rate Dn = 0.1 s
82-Driver 3
Disabled/Low Side = 1
Input = 73
Enable Input = 100
Because of the added requirement that Driver 3 be run at a variable duty cycle, Switch 4 is no
longer adequate to generate Driver 3’s duty cycle. Instead, duty cycle is generated from 40-Vehicle
Speed, with the requirement that duty cycle is variable from 25%–100% over vehicle speeds from
5%–30%. is function is accomplished by mapping 40-Vehicle Speed through one of the analog
Map functions. is map is congured to generate 0% output below 5% speed, so the threshold speed
detection in the previous example is no longer necessary.
Switch 4 must still control the pump on Driver 3, and the requirement of running only in the Forward
direction is still in place. ese signals are ANDed using 42-Logic Gate 2, and this signal is used as
the Enable Input for 73-Slew Limit 1.
Because vehicle speed is already generating a slew-limited duty cycle, it could be argued that 73-Slew
Limit 1 is no longer necessary. However, it’s used here to prevent the duty cycle from slamming on
if Switch 4 is applied while the vehicle is already at speed.
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Productinformatie
| Merk | Curtis |
| Model | 1229 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 19864 MB |
