SM800 DELTA ELEKTRONIKA BV
October 2007 OPERATING MAINTENANCE TROUBLE SHOOTING CALIBRATING Page 4 - 6
TROUBLE SHOOTING
1) GEN ERAL
• In case you need as sis tance for re pair ing a unit, please con tact
our en gi neers us ing the ad dress "Sup port@Delta-Elektronika.nl".
• In case you want us to re pair the unit, please first fill out the
RMA-form be fore send ing the unit to us. Add ing a de tailed fault
de scrip tion will help us to re pair the unit as soon as pos si ble.
On our website www.DeltaPowerSupplies.com the RMA-form
can be found un der 'Sup port'.
2) NO OUT PUT (man ual con trol)
• Check the LEDs ‘Re mote CV’ and ‘Re mote CC’ on the front panel,
they should be off. Dis able Key lock and press the RE MOTE/LO -
CAL button to turn both LEDs off.
• The LED ‘Out put On’ should be on. If this LED is off, dis able Key -
lock and push the but ton ‘OUT PUT ON/OFF’.
• Check the con nec tions on the SENSE BLOCK (at rear panel),
there should be a link be tween + and S+ and be tween – and S–
(see fig. 4 - 16).
• Check if there is a link in the In ter lock con nec tor (if not, the RSD
LED will be on).
• Set both the CV- and CC-limit po ten ti om e ter (at front panel) at
max i mum (fully clock wise).
• Turn both the CV and CC po ten ti om eters a few turns clock-wise.
A volt age should be pres ent on the out put.
• Dis con nect the ca bles from the out put and check if now there's a
volt age pres ent on the out put. If this is the sit u a tion, use a load
with a higher im ped ance or use a sec ond power sup ply in parallel.
3) PRO GRAMMING DOES NOT WORK OK
• Check the unit is in Re mote mode (Re mote CV and/or Re mote CC
LED should be on).
• The unit works OK in man ual con trol, but in pro gram ming
mode the out put volt age / cur rent has a large er ror.
Prob a bly the fuse in se ries with Ø (pin 1) of pro gram ming
connector trip ped, the fuse (F27_1 = 650 mA) is a self-resetting
type (see fig. 4 - 14).
• To check the fuse (F27_1) mea sure the volt age be tween Ø and
the mi nus out put, dur ing the fault con di tion. The volt age should
only be a few mV, a high volt age means that an un wanted cur rent
is flow ing through pin 1 of the prog. con nec tor.
Please check why cur rent is flow ing through pin 1 (see next para -
graph 4) and fig. 4 - 15).
4) PRO GRAMMING OFF SETS
• Un wanted off sets in the pro gram ming can be caused by
earth loops.
Fig. 4 - 15 shows a typ i cal earthing prob lem. In case the load has a
con nec tion to earth and the pro gram ming source as well, prob -
lems could oc cur. Im proper choice of the earthing point of the load
can give a volt age drop of ∆V1. Con necting the mi nus or zero to a
sep a rate earth con nec tion can give a volt age drop of ∆V2. Be -
cause the in ter nal wires of the pro gram ming in put are thin, the
volt age drops ∆V1 and ∆V2 will be across the in ter nal wir ing as
well. Re sulting in an er ror volt age in se ries with the pro gram ming
volt age.
• The best so lu tion for this is to use a float ing pro gram ming source,
a float ing load or the op tional in ter nal ISO AMP CARD (δ-prod uct).
5) STATUS OUTPUTS FAIL
• Check fuse F27_2 in se ries with Ø (pin 8 of CON E) (see fig. 4 -
14). To check the fuse mea sure the volt age be tween Ø and the mi -
nus out put, a high volt age means too much cur rent flow ing
through the fuse. F27_2 = 650 mA, self resetting.
fig. 4 - 14
Lo ca tion of pro gram ming fuses on P647
P647 is sit u ated di rectly be hind the rear panel
fig. 4 - 15
Un wanted pro gram ming off sets
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