Curtis 1352 handleiding
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5 — SDO COMMUNICATIONS
Curtis 1352 eXm Manual, June 2021
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pg. 28
Output Driver Mode
e eXm allows four distinct output control modes:
Input Only: e driver output is disabled. is mode is used when the output is used as
an input.
Constant Current: e eXm continually samples the output load current and automatically
adjusts the output PWM (500 times per second) to maintain the commanded current. e
load current will stay constant over varying battery voltage, load resistance variation, and
temperature. Current mode allows Dither, which puts a small variation on the current
command. Dither is used to keep proportional valves accurate and moving freely. e frequency
and the amount of dither can be adjusted.
Constant Voltage: e eXm continually samples the battery voltage and automatically
adjusts the output PWM to maintain an average output voltage to the load. e load voltage
is constant over varying battery voltage, as long as there is enough voltage to supply the
commanded output.
Direct PWM: e eXm simply outputs the commanded PWM.
e active modes (Constant Current, Constant Voltage and Direct PWM) can also have an additional
system check enabled called Open Detect. To enable this function, add 4 to the active mode setting
(i.e., Constant Current Mode = 1; Constant Current Mode with Open Detect = 1+ 4 = 5). Open Detect
checks that the driver output pin is connected to a load whenever the command is zero. When there
is no PWM, the output pin is basically connected to B+ through the load. If the load opens (wire is
disconnected or load fails), the Open Detect will signal a fault (Driver Open Fault) and shut down
that driver until the load is reconnected.
PI Controller
Constant Current and Constant Voltage Modes use a Proportional/Integral (PI) closed-loop
controller. ese controllers work to minimize the error between the command and the actual output.
To do this, the error is magnied by the Driver Proportional and Integral Gains. Normally, the factory
settings of these gains is sucient to control the load. However, there may be times when they need
to be adjusted to increase or decrease the responsiveness of the eXm.
If you nd that the eXm over-reacts to changes in battery or load, lower these gains. If it is too slow to
react, increase them. If the gains are set too high, the output may oscillate. Normally, the Proportional
and Integral gains are increased or decreased together. It is not recommended to have one gain very
high while the other is very low.
Changing Modes
Because each Driver Mode has its own scaling (amps, volts, or %), changing the mode also
automatically changes the range of the Output Max Value parameter. For safety, whenever the Driver
Mode parameter is written to, the Output Max Value parameter is set to minimum and the present
command (as set by the RPDO1 (RX) is set to 0. is is done because the eXm has no idea what the
desired output should be aer a mode change, and the last setting of the Output Max Value could
be out-of-range or unsafe. erefore the Output Max Value parameter must be written to with the
desired setting aer a mode change. e next RPDO1 (RX) will then reset the command to the
desired output value.
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Productinformatie
| Merk | Curtis |
| Model | 1352 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 5176 MB |
