DESCRIPTIONS
SM3000
Page 3 - 6
DELTA ELEKTRONIKA B.V.
rev. February 2018
26)
SERIES OP ER A TION
Se ries op er a tion is al lowed up to 600 V to tal volt age. The power sup plies
can be con nected in se ries with out spe cial pre cau tions.
For eas ier con trol, Mas ter / Slave op er a tion is rec om mended (see fig. 3 -
20). By us ing the Mas ter / Slave Se ries fea ture a
dual track ing
power sup -
ply can be made with one unit as mas ter and one as slave.
For se ries op er a tion in com bi na tion with Power Sink op tion, all units must
have a Power Sink built in side oth er wise no power can be ab sorbed.
27)
PAR AL LEL OP ER A TION
Par al leling of the units has no lim i ta tions. The power sup plies can be con -
nected in par al lel with out spe cial pre cau tions. For eas ier con trol, Mas ter /
Slave op er a tion is rec om mended (see fig. 3 - 20 and fig. 3 - 21).
Nor mal par al lel op er a tion of
Fast Pro gram ming
units can give prob lems,
each com bi na tion has to be tested first, in com bi na tion with the load !
For par al lel op er a tion in com bi na tion with
Power Sink
op tion, only one unit
can have a Power Sink. Re fer to Power Sink man ual for de tails and re stric -
tions.
28)
MASTER / SLAVE OP ER A TION
The Mas ter / Slave fea ture makes it pos si ble to use the power sup plies as
build ing blocks to form one large unit (see fig. 3 - 21).
The re sult ing com bi na tion of units be haves like one power sup ply and can
be pro grammed on the mas ter. Fig ure 3 - 23 shows a com puter con trolled
M/S par al lel com bi na tion.
Mixed par al lel - se ries op er a tion is also pos si ble (see fig. 3 - 22), to a max i -
mum of 600 V. Here the
MAS TER / SLAVE
SE RIES ADAPTER
(
δ
-prod uct)
must be used. For par al lel op er a tion con nec tions can eas ily be made on
the an a log pro gram ming con nec tor.
In se ries mode the mas ter con trols one slave, which in turn con trols the
sec ond slave and so on. In par al lel mode the mas ter con trols all the slaves.
The re sult is true
cur rent or volt age shar ing
in the par al lel or se ries mode
re spec tively.
Note: Mas ter / Slave par al lel op er a tion is not rec om mended for more
than 3 units or in com bi na tion with Fast Pro gram ming op tion.
Con sult fac tory for a so lu tion.
29)
RE MOTE SENSING
The volt age at the load can be kept con stant by re mote sens ing. This fea -
ture is not rec om mended for nor mal use but only when the load volt age is
not al lowed to vary a few mil li volts. Al ways use a
shielded ca ble
for sens -
ing.
In or der to com pen sate for the volt age drop across the load leads, the unit
will have to sup ply a higher volt age: U
out
= (volt age drop across each lead)
+ (volt age across the load) (see fig. 3 - 24). The
OVP
reads the volt age di -
rectly at the out put and the set ting must be in creased by the to tal volt age
drop across the load leads.
The volt me ter is con nected to the sense leads and there fore reads the volt -
age across the load and
not
the volt age on the out put ter mi nals.
The sense leads are pro tected for
ac ci den tal in ter rup tion
, in which case
the out put volt age will go to a max. of 115% of the set value.
Warn ing:
Do not in ter rupt the mi nus lead while the S– lead is still con -
nected to the load, dur ing op er a tion.
For sens ing on a
pul sat ing load
, see pre vi ous paragraph 17).
30)
OVP
The Over Volt age Pro tec tor 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 or a de fect in the power sup -
ply. The OVP cir cuit uses a sep a rate volt age di vider con nected di rectly to
the out put ter mi nals.
The OVP lim its the out put volt age to a value which can be set by the OVP
potmeter on the front panel. While do ing this, press the DIS PLAY OVP
SETTING but ton to read the limit value in the left dis play. The led on the
front panel will in di cate whether the OVP has reached the limit. The OVP
sta tus out put will give a logic 1 (+5 V).
Note: The Ther mal ShutDown and Re mote ShutDown will also cause the
OVP-led to burn and the OVP-status will be high.
fig. 3 - 20
Mas ter / Slave ser ies operation
fig. 3 - 21
Mas ter / Slave parallel operation
fig. 3 - 22
Mas ter / Slave mixed se ries-parallel
fig. 3 - 23
The Mas ter / Slave com bi na tion can also
be pro grammed with the in ter faces
PSC-488 or the PSC-232
