Delta Elektronika SM120-25D, Руководство по эксплуатации продукта

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SM3000 DESCRIPTIONS
rev. February 2018 DELTA ELEKTRONIKA B.V. Page 3 - 7
When the OVP sta tus out put is used as an in di ca tion for ac ci den tal in ter -
rup tion of leads, a de fect in the power sup ply etc., it is rec om mended to set
the limit well above the work ing out put volt age to avoid ac ci den tal lim it ing.
The rec om mended OVP set volt ages can be read from the fol low ing ta ble:
SM 15-200 D SM 30-100 D SM 45-70 D SM 70-45 D SM 120-25 D SM 300-10 D
Vovp
set Vout + 2 V Vout + 3 V Vout + 5 V Vout + 5 V Vout + 10 V Vout + 25 V
Ex am ple: For a SM30-100D set at 24 V out put volt age it is rec om mended to
set the OVP on 24 + 3 = 27 V.
31)
PO TEN TI OM E TERS
°
Stan dard:
-
CV and CC po ten ti om eters with knobs at front panel,
OVP po ten ti om e ter with screw driver ad just ment at
the front panel.
°
Op tion P001:
-
Screw driver ad just ment for CV, CC and OVP at the
front panel (see fig. 3 - 25).
°
Op tion P002:
-
Screw driver ad just ment for CV, CC and OVP at the
rear panel (no po ten ti om eters at front panel),
(see fig. 3 - 26).
32)
COOLING
A low noise blower cools the unit. The speed of the fan de pends on the tem -
per a ture of the in ter nal heatsink. At room tem per a ture and full load the fan
will run at a very low speed. The fan does not op er ate on no load. Normally
at 50 °C am bi ent and full load the fan will not work at full speed. Since the
fan is over-rated it will still have enough ca pac ity to cool the unit when dust
par tially ob structs the fins of the heatsinks.
A spe cial fea ture is that the fan blows 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 - 27).
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 nor mally pro duces a high pitched sound. This is nor mal.
33)
DI MEN SIONS
fig. 3 - 24
Re mote sens ing, volt age drop in load
leads sub tracts from max. out put
fig. 3 - 25
Screw driver ad just ment at front panel
fig. 3 - 26
Screw driver ad just ment at rear panel
fig. 3 - 27
The fan blows through a tun nel,
where the heatsinks are sit u ated