Installation
Local and Remote Sensing
Release 2.2
35
Local and Remote Sensing
The use of remote sensing permits the regulation point of the power supply to be
shifted from the output terminals (local sensing) to the load or other distribution
terminals, thereby automatically compensating for the voltage losses in the leads
supplying the load (provided these losses do not exceed 0.5V/line for the 8V model
or 1V/line for all other models). For example, with the voltmeter reading 10.0 volts
and the sense lines connected directly to the load, the load voltage will remain
regulated at 10.0 volts regardless of the voltage drops in the power leads and
variations in the load current.
On 8V, 20V, 33V, 40V, 60V, and 80V models, the positive sense connection is
available at pin 13 of connector J3 and the return sense connection is available at
pin 12. For local sensing (regulation at the power supply output terminals), the sense
pins are connected to pins 25 (positive output) and 24 (return) of connector J3. For
remote sensing, the local operation jumpers are removed and pins 13 and 12 are
connected directly to the positive and negative terminals of the load.
On 150V, 300V, and 600V models, the sense connections are available through the
output connector. (See
Figure 1.3, “J3 Program, Sense, and Monitor Connector
Description” on page 16
for the exact pin out.) On these models, no sense line
jumpers are required for local operation.
Sense wires can be any size (24AWG or larger) but in high noise environments or
when the lowest possible power supply ripple is required, sense wires must be
twisted and/or shielded.
Notes:
•
On 8V to 80V models the sense leads must always be connected, either for
remote or local sensing. Operation of the supply with the sense leads
disconnected will cause the output to fall to zero or to be unregulated.
•
NEVER
use the sense connections without the normal power lead connections
to the output terminals. Avoid reversing positive and negative sense lead
connections.