Sorensen MML Series Operation and Programming Manual
3-10
3.10 Short On/Off
The Load module can simulate a short circuit at its input by setting the load on with
full-scale current. The short circuit can be toggled on and off at the front panel or via
remote control. There are two operations for SHORT key on the front panel. One is
toggled on/off, and another controlled by key. They are selected in configuration.
The SHORT key will be enabled only when Load is ON.
Toggled on/off means pressing the SHORT key once to enable short circuit, and again
to disable. Control by Key means pressing and holding the SHORT key to enable
short circuit, and releasing it to return to normal operation.
The actual value of an electronic short depends on the mode and range that are active
when the short is turned on. In CC mode, it is equivalent to programming approxi-
mately 110% full-scale current about 30mS for the present current range, and then
going to rating current. In CR mode, it is equivalent to programming the minimum
resistance for the present resistance range. In CV mode, it is equivalent to program-
ming zero voltage. Turning on the short circuit does not affect the programmed setting,
and Load input will return to the previously programmed values when the short circuit is
turned off.
Note that turning on the short circuit may cause the Load to sink so much current to trig
protection circuit, and that will turn off the Load.
3.11 Load On/Off
A module’s input can be toggled on and off through the ON/OFF key on the front panel
of the Mainframe, or the LOAD key on the module or the remote control. The on/off
change of input is done according to the slew rate.
Turning off the load does not affect the programmed setting. The load will return to
the previously programmed values when the Load is turned on again.
3.12 Protection Features
Each load module includes the following protection features: Overvoltage, Overcurrent,
Overpower, Overtemperature, and Reverse Voltage.
The appropriate bits in the Mainframe’s statue registers are set when any of the
protection features mentioned above is active. Besides, the Load’s buzzer will
produce beep sound to inform you until protection status is reset. When any
protection occurs, it will cause the Load input to be turned off.
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