DELTA ELEKTRONIKA BV SM3000
Page 4 - 6 OPERATING MAINTENANCE TROUBLE SHOOTING CALIBRATING 1991, rev. May 2008
TROUBLE SHOOTING
1) GEN ERAL
• In case you need as sistance for re pairing a unit, please con tact
our en gineers us ing the ad dress "Support@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
description will help us to re pair the unit as soon as pos sible.
On our website www.DeltaPowerSupplies.com
the RMA-form
can be found un der 'Sup port'.
2)
NO OUT PUT (nor mal op er a tion)
• Check in put fuses.
• Check po si tion of prog. switches at the rear panel, they should be
on MAN UAL.
• Check the connections on the SENSE BLOCK (at rear panel),
there should be a link be tween + and S+ and be tween – and S–.
• Set OVP po tentiometer (at front panel) at maximum (fully clock
wise).
• Switch on unit.
• Turn both the CV and CC po tentiometer a few turns clock-wise. A
voltage should be pres ent on the output.
3)
PROGRAMMING DOES NOT WORK OK
• Check po si tion of prog. switches at rear panel.
• The unit works OK in manual con trol, but in pro gramming
mode the output voltage / cur rent has a large er ror.
Probably the fuse in se ries with Ø (pin 1) of prog. connector trip-
ped, the fuse (F600 = 650 mA) is a self-resetting type (see
fig. 4 - 16).
• To check the fuse (F600) measure the voltage be tween Ø and the
minus out put, during the fault con dition. The volt age should only
be a few mV, a high volt age means that an un wanted cur rent is
flowing through pin 1 of the prog. con nec tor.
Please check why cur rent is flowing through pin 1 (see also next
para graph 4) and fig. 4 - 17).
4)
PRO GRAMMING OFF SETS
• Unwanted off sets in the pro gramming can be caused by
earth loops.
Fig ure 4 - 17 shows a typical earthing prob lem. In case the load
has a con nection to earth and the programming source as well,
problems could occur. Improper choice of the earthing point of the
load can give a voltage drop of ΔV1. Con necting the mi nus or zero
to a sep arate earth con nection can give a volt age drop of ΔV2. Be -
cause the in ternal wires of the pro gramming in put are thin, the
voltage drops ΔV1 and ΔV2 will be across the in ternal wir ing as
well. Re sulting in a error voltage in se ries with the pro gramming
volt age.
• The best so lu tion for this is us ing a float ing pro gramming source
with the help of the ISO AMP CARD
(δ-prod uct) or a floating load.
5)
STATUS OUTPUTS FAIL
• Check fuse F601 in se ries with Ø (pin 8) (see fig. 4 - 16). To check
the fuse (F601) measure the resistance be tween Ø and the mi nus
output, an open circuit means a blown fuse. F601 = 650 mA.
6)
MASTER / SLAVE PAR ALLEL PROB LEMS
• Ac ci den tal in ter rup tion of a mi nus lead of a unit dur ing op er a tion
will cause fuse F600 to blow (see fig. 4 - 16). To check the fuse
(F600) measure the resistance be tween Ø (pin 1 of prog. conn.)
and the mi nus out put, the fuse is a self re setting type.
F600 = 650 mA
• Check link be tween pin 9 and 11 on the prog. con nector of the
slaves
• Current sharing is not ok. Prob ably the links be tween S– and – of
the slaves are not re moved.
fig. 4 - 16
Lo ca tion of pro gram ming fuses on P432
P432 is situated on the rear panel
fig. 4 - 17
Un wanted pro gram ming off sets
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