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 "
".
•
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
Δ
V1. Con necting the mi nus or zero
to a sep arate earth con nection can give a volt age drop of
Δ
V2. Be -
cause the in ternal wires of the pro gramming in put are thin, the
voltage drops
Δ
V1 and
Δ
V2 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
