SM1500 MAINTENANCE & CALIBRATION
rev. August 2018 DELTA ELEKTRONIKA B.V. Page 6 - 1
6 MAINTENANCE & CALIBRATION
1 GEN ERAL
• The SM-se ries power sup plies do not need any main te nance or
cal i bra tion.How ever, care must be taken that the cool ing unit is
not ob structed.
2 COOL ING FAN
• The built up of dust on the im pel ler of the fan and the heat sink fins
de pends on the en vi ron ment. Since the fan has over-ca pac ity,
dust will not pres ent a prob lem very quickly.
• The in ter nal con struc tion of the power sup ply is such that no dust
will reach the sen si tive con trol cir cuitry, only the heat sink in a tun -
nel will be cooled by forced air (see fig. 6 - 1).
• The ther mal pro tec tion will shut down the out put in case of over -
heat ing, so the power sup ply will not be dam aged.
• It is ad vis able to in spect the fan and the heat sink reg u larly.
3 GAL VANIC IN DUS TRY
• For us ing the power sup plies in the gal vanic in dus try it is strongly
rec om mended to take pre cau tions against an ag gres sive en vi -
ron ment.
• An ag gres sive en vi ron ment with acid, salt, etc. can harm the elec -
tronic com po nents. Some times even the cop per tracks on the
printed cir cuit boards dis solve.
• To avoid prob lems, the power sup plies should be mounted in a
rel a tively clean room, or mounted in a cab i net re ceiv ing clean air
with over pres sure, or a cab i net with a heat exchanger.
4 CAL I BRA TION
• The power sup plies are fac tory cal i brated and nor mally need no
fur ther cal i bra tion.
• Only in spe cial sit u a tions, for ex am ple af ter re pair ing a unit, cal i -
bra tion can be nec es sary.
5 ME TER CAL I BRA TION
• DIG I TAL ME TERS
The full scale in di ca tion can be cal i brated with R25_31 and
R25_36 on P596 (see fig. 6 - 2).
6 SPE CIAL CAL I BRA TIONS
• The fol low ing cal i bra tions must be done by qual i fied per son nel
only. Wrong cal i bra tion causes mal func tion. These cal i bra tions
are only needed af ter spe cial re pairs.
Warn ing ! Dam age caused by a wrong cal i bra tion is not
war ranted.
• CAL I BRAT ING THE CUR RENT
MON I TOR OFF SET.
With R26_73 on P650 the off set of the CC mon i tor volt age can be
cal i brated (see fig. 6 - 3). The unit has to be un loaded, the out put
volt age has to be turned off us ing the OUT PUT ON/OFF but ton.
Mea sure the off set volt age of the CC mon i tor on the pro gram ming
con nec tor. Cal i brate the off set on a neg a tive value be tween –1
mV and zero mV.
Warn ing! wrong cal i bra tion can dam age the unit.
• CAL I BRAT ING MAX. CUR RENT RANGE or CAL I BRAT ING CC
MON I TOR FULL SCALE.
Short the out put us ing a low re sis tive ca ble. Mea sure the out put
cur rent with an ac cu rate shunt. The max i mum out put cur rent can
be cal i brated with R26_41. R26_41 is lo cated on P650 (see
fig. 6 - 3).
Pro gram CC in put with ex actly 5.00 V.
Set out put volt age to a high value, en sur ing the power sup ply is in
CC mode. Cal i brate the cur rent with R26_41 ex actly on the rated
max. cur rent.
Warn ing! Wrong cal i bra tion can dam age the unit.
fig. 6 - 1
The fan blows through an in ter nal tun nel,
where the heatsink is sit u ated.
Al ways take care to have the air out let un ob -
structed.
fig. 6 - 2
Me ter cal i bra tion with 25-turn potmeters on
P596
fig. 6 - 3
Cal i brating max. cur rent and off set on P650.
full scale
offset
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