Datasheet

DELTA ELEKTRONIKA BV SM800
Page 3 - 2 DESCRIPTIONS October 2007
fig. 3 - 4
Pro gram ming in puts (in ter nal cir cuit)
9) AN A LOG PRO GRAMMING
The out put volt age and cur rent can be pro grammed by an ex ter nal an a log
volt age. This pro gram ming is very ac cu rate and lin ear. The lev els are all
stand ard ised on 5V.
The in puts have a pro tec tion cir cuit formed by a se ries re sis tor and a
par al lel zener (see fig. 3 - 4). The ca pac i tor lim its the speed to a safe
value. Note that the an a log in puts (and out puts) are not float ing, but the
com mon is con nected to the neg a tive out put ter mi nal. Wrong con -
nec tion of Ø can cause earth loops which can trip the fuse. Af ter re mov ing
the fault, the fuse will re set (PTC-fuse). For iso lated pro gram ming, see
next para graph 10).
10) ISO LATED AN A LOG PRO GRAMMING
To pre vent earth loops which can cause pro gram ming er rors, use an iso -
lated pro gram ming source. If this is not pos si ble, use the op tional ISO
AMP CARD (δ-prod uct) which can be built in side the unit.
With the ISO AMP CARD earth loops be tween the unit and the pro gram -
ming source are prevented.
11) ETHERNET / IEEE 488 / RS232 PRO GRAMMING
The Delta Elektronika PSC-ETH, PSC-488 and the PSC-232 con trol lers
can be built in side the unit.
Volt age and cur rent can eas ily be pro grammed and read back. Also all
the sta tus out puts can be read by the com puter.
12) MON I TORING OUT PUTS
The mon i tor out puts give a volt age 0 - 5 V pro por tional to the out put cur -
rent or volt age. The out put cur rent can eas ily be mea sured us ing the
I-mon i tor (see fig. 3 - 6). The mon i tor out puts are buf fered with op-amp’s
and pro tected with se ries re sis tors and par al lel zeners (see fig. 3 - 7).
The ta ble in fig. 3 - 5 shows the im ped ance lev els of the mon i tor ing out -
puts.
For us ing Imon on a pul sat ing load, see para graph 20) of this chap ter.
13) +12V ON PRO GRAMMING CON NEC TOR
The +12V on the pro gram ming con nec tor can be used to sup ply ex ter nal
circuits. The out put is cur rent lim ited, but should not be over loaded. The
fuse F27_3 on pcb P647 could blow. The fuse F27_3 also pro tects the in -
ter nal cir cuit, in case an ex ter nal high volt age is ap plied by ac ci dent.
Note: this fuse is a spe cial 600V type, al ways re place with the same type.
14) STATUS OUT PUTS
All the sta tus out puts are logic out puts. Logic "0" means the out put is 0 V,
logic "1" means the out put is 5 V (Ro = 500 Ohm). This makes it pos si ble
to drive di rectly: an opto-coupler, a TTL gate or a CMOS gate.
The Limit Sta tus or LIM-status is "1" in case the out put volt age or cur rent
reaches the limit set ting. Which limit cir cuit is ac tive can be seen on the
front panel LED’s.
fig. 3 - 5
Con nec tions AN A LOG PROG. CONNECTOR
pin
De scrip tion, see par.12)...17) for details
1
Ø, re turn of ref er ence, prog. in puts and
mon i tor out puts (Ro = 1.2 Ohm).
2
cur rent mon i tor out put 0 - 5V
(Ro = 1.2 Ohm, Io max = 4 mA)
3
cur rent pro gram ming in put (0 - 5V),
Ri = 8 MOhm
4
CC sta tus out put, logic 1 = CC mode
(5 V / 500 Ohm)
5
Re mote shut down (4 - 12 V),
Ri = 5 kOhm
6
PSOL sta tus out put, logic 1 = PSOL
(5 V / 500 Ohm)
7
+12 V out put
(Ro = 3 Ohm, Io max = 0.2 A)
8
Ø, re turn of sta tus out puts, +12 V
and re mote shut down
9
ref er ence volt age 5.1 V
(Ro = 1.2 Ohm, Io max = 4 mA)
10
volt age mon i tor out put 0 - 5V
Ro = 1.2 Ohm, Io max = 4 mA)
11
volt age pro gram ming in put (0 - 5V)
Ri = 8 MOhm
12
OT - sta tus out put, logic 1 = OT
(5 V / 500 Ohm)
13
LIM - sta tus out put, logic 1 = LIM
(5 V / 500 Ohm)
14
DCF - sta tus out put, logic 1 = DCF
(5 V / 500 Ohm)
15
ACF - sta tus out put, logic 1 = ACF
(5 V / 500 Ohm)
fig. 3 - 6
Ex ter nal me ters
us ing mon i tor out puts
fig. 3 - 7
Buf fered mon i tor out puts
(in ter nal cir cuit)