MoTeC PDM30 - Manual (Page 24)

MoTeC Configuration 21
Tip: A condition can also be configured in the output pin setup. In this case
the outcome of the logic function will not create a new channel but will be
directly connected to the output channel.
To configure a Condition or Counter

In the Configuration Tree, select Functions

On the Edit menu, click Add

Select the function type (Counter or Condition)

Type a channel name and select settings as required
Output Pins
All outputs are high side type outputs; they switch Batt+ to the output pin. All
outputs have hardware thermal overload protection, fault logic and over-
current logic.
Paralleled Outputs
When two or more output pins are connected in parallel, they must be
configured to use a common channel or an identical condition to activate
them.
Note: outputs that are connected in parallel must all be of the same type;
either all 8 Amp or all 20 Amp outputs.
Output Protection
Over-Current Shutdown
An Over-Current Shutdown occurs when the Output Load exceeds 100%,
which corresponds to the maximum current setting.
The Output Load value is filtered so that it normally increases (and
decreases) slowly, modelling how the temperature of a wire responds to
the current flowing through it. The resultant characteristic is very similar to
a thermal circuit breaker which is often used in motorsport applications. It
is also similar to a slow blow fuse. See Fuse Characteristics for details.
The filtering of the load value ensures that the start-up current (inrush
current) of motors and lamps does not cause the output to shutdown
during this period. It also allows for short term overloads to occur without
the output shutting down.
A large over-current such as a short circuit will cause the Output Load
value to increase rapidly, causing the output to shutdown in a short period
of time to protect the wire and the PDM output. The filtering is set with a
time constant of 20 to 50 seconds based on the maximum current setting.
These values conservatively suit the appropriate wire gauge for the