SM6000 DELTA ELEKTRONIKA BV
July 2003, rev. May 2008 DESCRIPTIONS Page 3 - 7
33) VOLTAGE AND CUR RENT LIMIT
The Voltage Limit will pro tect your circuit from un wanted high voltages. A high
out put volt age could be caused by ac ci den tal in ter rup tion of leads, ac ci den tally
turning up the voltage potmeter, a pro gramming er ror or a de fect in the power
supply. The Volt age Limit circuit uses a sep arate voltage di vider con nected di -
rectly to the output terminals.
The Cur rent Limit pro tects your circuit from un wanted high currents.
The Voltage and Cur rent Limits maintain the output to a safe pre set value.
They do not trip, so no re setting is needed after a fault. It can be very handy to
have hard ware lim its when the power sup ply is pro grammed.
The lim its can easily be set by press ing the DISPLAY LIMITS but ton and ad -
justing the potentiometers with a screwdriver. The LED’s next to the potmeters
indicate the ac tivity of each limit, also the LIM-status out put will be "1".
34)
PO TEN TI OM ETERS AND ENCODERS
° Stan dard: - CV and CC po tentiometers with knobs at front panel,
Volt age Limit and Cur rent Limit po ten ti om eters with
screwdriver ad justment at the front panel.
° Op tion P001: - Screwdriver ad justment for CV, CC, Voltage Limit and
Current Limit at the front panel (see fig. 3 - 22).
° Op tion P220: - Dig i tal encoders for CV and CC set ting with a very long
life time and in telligent functions (e.g. Keylock).
Setting of CV-limit and CC-limit with screw driver ad just-
ment an a log po ten ti om eters at the front panel.
35)
COOLING
Two low noise blowers cool the unit. The speed of the fans de pend on the tem-
per a ture of the in ter nal heatsink. Normally at 50 °C am bient and full load the
fan will not work at full speed.
A spe cial fea ture is that the fans blow through a tun nel where the heatsinks are
situated, the del icate con trol circuitry is sep arated and will not be in the air flow
path (see fig. 3 - 23).
Because the air en ters at the left and ex its at the right side, it is pos sible to stack
the power sup plies, no distance be tween the units is re quired. Only the ven tila-
tion open ings at the left and right side should be free.
For long life the temperature of the air en tering on the left side, should be be -
low 35 °C un der nor mal con ditions. Un der ex treme conditions it should be be -
low 50 °C.
Note: The con trol circuit makes the fan start in a pul sating mode, during which
period it can pro duce a high pitched sound. This is nor mal.
36)
DI MEN SIONS
fig. 3 - 22
Screwdriver ad justment at front panel
fig. 3 - 23
The two fans blow through the tun nels,
where the heatsinks are situated
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