Control Systems
OBR Control Systems Inc
OBR Control Systems Inc
Telephone : +1 (248) 672-3339
32233 West 8 Mile Road
www.obrcontrolsystems.com
Livonia, Michigan 48152
USA
51 / 92
9.7 Wiper Outputs
2 dedicated outputs for wiper motors are available. These two channels have additional protection
diodes and can handle the load dump created when the wiper motor stops.
Wiper motors can also be controlled by the LIN bus (in preparation).
The 2 power outputs can supply a maximum continuous current of 13..25 A each channel.
Please observe that our default maximum current level for each channel is set in accordance with
Deutsch’s current limit for the size AWG20 contacts in the Autosport 20-39 connector.
The driver stages can deliver significantly more current, but it is important to avoid overloading the
wiring and contacts in the connector.
Please note, that if the wipers operates on a dry windscreen, the current draw will be much higher
than when used on a wet screen.
Once an output is turned on, the current draw depends on the attached load.
- If this load is a resistive load, there will hardly be any inrush current.
- If the output drives a motor or a lamp, for example, there can be a substantial inrush for a
certain amount of time. The current draw will quickly decrease and reach a steady state
level.
Outputs are protected by three current thresholds and three timers:
- OCH is the high current threshold of 75 A.
- OCL is the user defined continuous current threshold, selectable between 7.5 A to 12.5...25 A.
- OCS is the software selected current
threshold.
Switching an output ON, an inrush current
up to and in excess of 75 A is allowed for a
20 usec time interval.
After these 20 usec the current level must
be below OCH which is 75 A.
Within a time interval, selectable between
0.15 to 155 msec, from switching the output
ON, the current draw must have fallen
below the OCL threshold. This threshold
can be set to 7.5 / 10 / 12.5..25 A.
In column “
INIT ms”
key in the time delay for
applying the steady state fuse level defined
in “
NORM mA”
. This interval must exceed the time interval selected for OCL, suggested value >
200 msec.
