OPERATING - TROUBLE SHOOTING - CALIBRATING SM3000
Page 4 - 2 DELTA ELEKTRONIKA B.V. rev. February 2018
5) STATUS OUT PUTS
• The sta tus out puts have a sep a rate Ø con nec tion (pin 8) to
avoid un wanted off sets in the pro gram ming. This pin is pro -
tected with a 650 mA fuse (F601 on P432).
6) RE MOTE SENSING
• Re move the links on the SENSE BLOCK (on rear panel) and
con nect sense leads (thin shielded mea sur ing wires) to S+
and S– (see fig 4 - 5 and fig. 4 - 6).
• With re mote sens ing the volt age on the load can be kept con -
stant. The volt age drop in the load leads will be com pen sated.
This fea ture is not rec om mended for nor mal use, be cause it
can eas ily give prob lems.
• Max. 2 V per load lead can be com pen sated. Note that the
volt age drop in the leads de creases the max. out put volt age
rat ing. In fig. 4 - 7 can be seen that on a 15 V power sup ply
only 11 V will be avail able on the load when 2x 2 V com pen sa -
tion is used.
• In or der to pre vent in ter fer ence it is ad vis able to twist the
sense leads. To min i mize the in duc tance in the load leads
keep the leads close to each other. The in duc tance of the
loads leads could give a prob lem with pul sat ing loads. In this
case a large elec tro lytic ca pac i tor (Cd) in se ries with a damp -
ing re sis tor (Rd) both in par al lel with the load will help (see fig.
4 - 6). Check that the ca pac i tor Cd in com bi na tion with the load
leads and re sis tor Rd forms a well damped cir cuit.
• Since the volt me ter is in ter nally con nected to the sens ing ter -
mi nals, it will au to mat i cally in di cate the volt age on the load.
Note that the volt age mea sured on the load will be lower than
on the out put ter mi nals.
• The Over Volt age Pro tec tor mea sures the volt age on the out -
put ter mi nals, so the OVP set ting should be in creased by the
to tal volt age drop in the load leads.
7) BAT TERY CHARGER
• The CV / CC reg u lated power sup plies are ideal bat tery charg -
ers. Once the out put is set at the cor rect volt age the bat tery
will charge con stantly with out over charg ing. This can be use -
ful for emer gency power sys tems.
• Pro tec tive mea sures
Use a CIR CUIT BREAKER in se ries in or der to pro tect the
power sup ply from ac ci den tal re verse con nec tion (see
fig. 4 - 8). The cir cuit breaker should have a DC volt age rat ing
2x the bat tery volt age. Use the very fast type (Z), a type meant
for pro tect ing semi con duc tors.
The unit has a re verse di ode in par al lel with the out put, this di -
ode and the wir ing can not with stand the thou sands of am -
peres sup plied by a wrongly con nected bat tery.
Sug gested cir cuit break ers for pro tec tion power sup ply
Model Type num ber
cir cuit breaker
Brand Re marks
SM 15-200 D HTI102 B 100 GE 2 poles par al lel
SM 30-100 D HTI102 B 100 GE
SM 45-70 D HTI102 B 100 GE
SM 70-45 D S281 UC-Z 50 ABB
SM 120-25 D S281 UC-Z 25 ABB
SM 300-10 D S282 UC-Z 10 ABB 2 poles in se ries,
ex tra par al lel
di ode on
out put needed
=OP TION P023
• Re mote sens ing can not be rec om mended, be cause it eas ily
causes de fects in side the power sup ply in case of wrong con -
nec tion.
If you re ally need re mote sens ing, please use the cir cuit (see
fig. 4 - 9). The in ter nal cir cuit can be pro tected by rel a tively
small anti-parallel di odes. To pro tect the anti-parallel di odes,
please con nect the fuses in se ries as in di cated in fig. 3 - 9 . A
prac ti cal choice for the fuses is 250 mA, the di odes can be any
nor mal 3 or 5 A type.
fig. 4 - 5
Lo cal sens ing
fig. 4 - 6
Re mote sens ing with shielded wires
fig. 4 - 7
Re mote sens ing, volt age drop in load leads sub -
tracts from max. out put
fig. 4 - 8
Charg ing bat tery with a cir cuit breaker in se ries
fig. 4 - 9
Pro tect ing sense wires with di odes
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