Local Operation
M370430-01 Rev B 3-33
Using the External Shutdown Function
Use the external shutdown function to enable or disable the output of the
power supply via a logic level signal. When the external shutdown is
triggered, the power supply will display SD POL on the output voltage
and current displays. The external shutdown is useful for making
adjustments to either the load or the power supply without shutting off
the power supply or for using the power supply as part of a larger test
system in which digital or analog control is required.
Activating the External Shutdown Function
To activate the external shutdown function, use the AUX output supply
provided on the Analog Programming Connector J3. This input has a
user selectable polarity with logic low input from 0.0V to 1.2V and
logic high from 2.0V to 15V. The control signal for this input must be
capable of sinking 10mA minimum. This input is also compatible with
the use of dry contacts, where a short is logic low and an open is logic
high. The input lines of the shutdown circuit are fully optically isolated.
See page C-8for specifications.
Once the External Shutdown has been triggered, the display will blink
the .
Controlling the External Shutdown Function
The external shutdown circuit accepts a voltage or dry contact control
(high or low logic level) to enable or disable the power supply output.
Make connections for the signals at the AUX Output and Isolated
Analog Programming Connector on the rear panel. (See “AUX Output
and Isolated Analog Programming (ISOL) Connector” on page 4-20 for
more information.)
To activate the shutdown function:
Connect the control signal source to the Shutdown pin (J3.12) on the
Aux Output and Isolated Analog Programming Connector with the
control circuit ground connected to Isolated Ground pin (J3.6).
The External Shutdown pin is pulled high internally (normally high).
Therefore, if this feature is not used, the polarity should be set to 1 to
avoid false triggering. (See “Defining the Polarity of the External
Shutdown Signal” on page 3-34 for instructions.)
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