Delta 16 SM600 Datasheet download pdf (Page 13)

SM6000 DELTA ELEKTRONIKA BV

July 2003, rev. March 2012 DESCRIPTIONS Page 3 - 7

33) VOLT AGE AND CUR RENT LIMIT

The Volt age Limit will pro tect your cir cuit from un wanted high volt ages. A high

out put volt age could be caused by ac ci den tal in ter rup tion of leads, ac ci den tally

turn ing up the volt age potmeter, a pro gram ming er ror or a de fect in the power

sup ply. The Volt age Limit cir cuit uses a sep a rate volt age di vider con nected di -

rectly to the out put ter mi nals.

The Cur rent Limit pro tects your cir cuit from un wanted high cur rents.

The Volt age and Cur rent Limits main tain the out put to a safe pre set value.

They do not trip, so no re set ting is needed af ter 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 eas ily be set by press ing the DIS PLAY LIMITS but ton and ad -

just ing the potentiometers with a screw driver. The LED’s next to the potmeters

in di cate the ac tiv ity of each limit, also the LIM-status out put will be "1".

34) PO TEN TI OM ETERS AND ENCODERS

At the front panel, stan dard ev ery unit is equipped with knobs for the CV and

CC con trols and with screw driver ad just ment for the Volt age and Cur rent Limit.

The SM300-20 and SM600-10 have dig i tal encoders for the CV/CC-con trols,

with a very long life time and in tel li gent func tions such as vari able coarse/fine

pitch ad just ment, lock ing of CV/CC-set tings and a selectable start-up volt age

(start at 0V/0A or at last set tings).

The lower volt age units have an a log po ten ti om eters for the CV/CC-con trols .

Op tional they can be equipped with screw driver ad just ment for

CV/CC-settings at the front panel or also with dig i tal encoders (op tion P220).

See fig. 3 - 22 for op tion P001.

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 bi ent 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

sit u ated, the del i cate con trol cir cuitry is sep a rated and will not be in the air flow

path (see fig. 3 - 23).

Be cause the air en ters at the left and ex its at the right side, it is pos si ble to stack

the power sup plies, no dis tance be tween the units is re quired. Only the ven ti la -

tion open ings at the left and right side should be free.

For long life the tem per a ture of the air en ter ing on the left side, should be be -

low 35 °C un der nor mal con di tions. Un der ex treme conditions it should be be -

low 50 °C.

Note: The con trol cir cuit makes the fan start in a pul sat ing mode, dur ing which

pe riod it can pro duce a high pitched sound. This is nor mal.

36) DI MEN SIONS

fig. 3 - 22

Screw driver ad just ment at front panel

fig. 3 - 23

The two fans blow through the tun nels,

where the heatsinks are sit u ated

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 22 23

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Delta 16 SM600 Datasheet Page 13

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