Gettin
Familair with the Power Supply 4 - 7
4.3 OUTPUT CHANNEL CONNECTIONS
WARNING: To prevent SHOCK HAZARD, turn off the line power before
makin
output channel connections or disable the output
channel concerned. All wires and straps must be properly
insulated, and connected with terminal block screws securely
ti
htened. Before any connection can be made, the plastic
terminal block cover must be unscrewed and removed. When
the connections have been made, the plastic terminal block
cover must be secured a
ain.
Each output channel has been provided with a set of four terminals. The inner two
have been marked as - V(olta
e) and + V(olta
e), while the outer two have been
marked as - S(ense) and + S(ense). At delivery the +V and +S, as well as the -V
and -S terminals have been interconnected by straps.
The volta
e at the sense terminal(s) equals the pro
rammed value. The volta
e
at a connected load may differ from the pro
rammed value, because of a volta
e
drop dependin
on the resistance of the wires to the load and the current throu
h
the load.
If the volta
e drop is ne
li
ible, the load wires only have to be connected to the
+V and -V terminals. This is called ’local sensin
’.
However, if the volta
e drop is si
nificant, the volta
e at the load can differ from
the pro
rammed value. To prevent this, the straps between the +V and +S and -
V and -S terminals must be removed and the load wires must also be connected
to the +S and -S terminals. This is called ’remote sensin
’.
Note: The terminals have been shielded with a plastic block cover which must
be removed before any connection can be made.
WARNING: To avoid FIRE HAZARD, select a wire lar
e enou
h to carry
short-circuit current without overheatin
. Two factors must be
considered when selectin
the wire size for load connections:
- Conductor temperature, i.e., the current-carryin
capacity.
- Total volta
e drop, i.e., the wire len
th and thickness.
- S- V+ V+ S
load
Rear view of an output channel connected to a load:
- S- V+ V+ S
load
(local sensin
) (remote sensin
)
