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
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9.2 Low Power Outputs
This section gives access to:
Naming of output
Set inrush current threshold
Set time interval for inrush current
Set the normal fused threshold
Set the number of retries once a fault is detected before switching off
Set the time interval for fault resetting
26 low power outputs are available, supplying 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.
Current draws can be measured on all outputs.
On outputs 1..22 current can be measured from 200 mA to full load. Outputs 23..26 all have
increased resolution making them a preferred selection for lift pumps, for example.
The driver stages can deliver significantly more current, but it is important to avoid overloading the
wiring and contacts in the connector.
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 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 A…25 A.
