Sorensen DCS-E Series - Remote OVP Sensing; 2.10 Remote ON;OFF; Remote ON;OFF by Contact Closure

SORENSEN DCS SERIES MANUAL INSTALLATION and OPERATION
2-15
2.9.5 Remote OVP Sensing
The default configuration for the OVP circuit senses the output voltage at the power supply output terminals. For
applications using remote sensing where there is a need to accurately monitor the actual load voltage, the following
procedure allows the OVP sense point to be shifted from the power supply output to the sense line connection
points.
1. Shut the unit off and disconnect it from its power source. Remove the cover from the unit.
2. Using a sharp Exacto knife, cut the component side trace connecting the right hand side of resistor
R89 to the via marked OVP-LOC.
3. Install an piece of insulated #22 AWG wire from the via marked C (near the trace cut just made) to
the via marked C1 (near capacitor C51).
4. Reinstall the cover and reconnect the unit to its power source.
To return to local OVP sensing, remove the jumper installed in step 3 above and install a jumper across the trace
cut made in step 2.
2.10 Remote ON/OFF
This feature is useful in test applications requiring remote ON-OFF control of the output. The remote ON-OFF
control circuit uses either a TTL compatible or a 12-250Vac (or 12-130Vdc) input to remotely control (disable or
enable) the power supply output. For TTL operation, a logic level signal between pins 14 (positive) and 2 (return)
of connector J3 determines the output conditions:
TTL LOW = OUTPUT ON
TTL HIGH = OUTPUT OFF
For AC or DC operation, an input of 12-250Vac (or 12-130Vdc) between pins 1 (positive for DC input) and 2
(return) of connector J3 will disable the output of the supply.
A red LED on the front panel indicates when the shutdown circuit is activated. The input lines are optically
isolated and can therefore be accessed by circuits with a voltage differential of up to 600Vdc.
2.10.1 Remote ON/OFF by Contact Closure
An external relay may be used to operate the ON/OFF control circuit as follows. Connect one side of a normally
open relay to pin 15 of connector J3 (+12V). Connect the other side of the relay to pin 14 (TTL Shutdown). Also
connect J3 pin 2 (Shutdown return) to pin 6 (Ground). Using this configuration, the power supply will be OFF
when the relay coil is energized and ON when the relay is de-energized.
If a normally closed relay is substituted for the normally open relay in the configuration described above, the power
supply will be ON when the relay coil is energized and OFF when the relay is de-energized.
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