Farnell TSV 70 - Page 7

OUTPUT AND SENSE TERMINALS.
Units are normally supplied with the "+ SENSE" and the
"+ OUTPUT" terminals linked, and the "- SENSE" and the
"- OUTPUT terminals linked. The load should be connected
to the "oUTPUT" "+" and "-" terminals. The supply is
connected to the load when the "OUTPUT" Switch is in its "ON"
For applications requiring correction of voltage drop
along the leads connecting the supply to the load, the links
between the "sENSE" and "oUTPUT" terminals should be
removed and the current carrying leads to the load connected
to the "oUTPUT" terminals. Another pair of leads should
then be connected between the load and the "SENSE" terninal,
ensuring that the positive end of the load is connected to
the "+" "SENSE" terminal and the negative end of the load is
Connected to the "-" SENSE terminal. Care should be taken
to ensure that no load current is drawn from the "SENSE"
terminals. For notes on the limitations and use of this
OUTPUT SWITCH.
This disconnects the negative of the supply from the
load when the switch is in the "OFF" position, and enables
the required output voltage to be set before the load is
Connected, The load may also be disconnected from the
supply without having to switch off the mains input.
COOLING.
The series regulator elements of the supply are fan
Cooled. The air intake for the fan is on the rear right
hand side of the unit and the air outlet is on the rear left
hand. side.. Care must be taken not to obstruct the air
inlet or outlet. I£ Such an obstruction is present or
the cooling fan fails, a thermal trip within the unit will
operate and shut the supply down when the load conditions
are such as to give rise to a dangerous temperature on the
series regulator. The trip will reset the output when the
series regulator temperature is approximately 30°C below the
trip temperature, and if the cause of excess temperature is
still present it wi11 trip once again when the trip
temperature is reached. This cy cle will be repeated as
long as mains input is applied to the unit and the cause of
excess temperature is not .removed.
The transformer and rectifiers within the unit are
Cooled by natural convection and no mOre than two units
should be stacked one above the other without provision
being made to force cool the stacked system in a vertical
direction.
- 3 -
position.
mode of operation refer to SECTION 6 page. 10.