Troubleshooting - Marconi LORAIN RHM800E50 Manual

Section 4367
relay Kl on A9 causes the relay to release. activating ah
external rectttier fail alarm circutt. if connected.

7. TROUBLESHOOTING

Before attempting to troubleshoot this rectifier, it
7.1
must be determined that a failure has occurred in the
rectifier. Since various rectifier alarms sense battery
voltage. an incorrect battery voltage
to the recttfier as an alarm condiion. Erroneous alarm
caused by tnterconnection with other equipment, Some
examples of interconnecting equipment which could
cause incorrect battery voltage are given below. Elfi-
before proceeding.
a) When used in a power system, certain fail-
ures in DC-DC Converters an&x DC-AC
sequently cause akrm tndicators on the ret-
b) When used with other parallel connected
Once trouble has been isolated to the rectttir.
various visual and operational chedrs should be made
to eliminate obvious failure causes.
Fault Isolation Chart Usa
7.3 The fault isolation chart inctuded tn these instruc-
tions is desigkd to aid service personnel in locating
of a flow diagram containting interrogatory and directtve
statements in diamond-shaped and rectangular geo-
metric figures, respecbtely. A yes or no response suffi-
ciently answers each inquiry, and the servicing
of flow to the next inquiry or diractive statement. The
directive statements require that the technician perform
an adjustment or test to verify certaii operational mndii
Page 24
tions. If the line of flow terminates in a blodt entitled
POSSIBLE CAUSES, the servicing technicii should
action if a faulty mmponentorassembly is located.
could reflect bade
s - l
t e s t
connected to the nxtifier while it is operating.
7.4
circuit card. that particular circuit card should be
replaced in its enttrety. No attempt should be made to
troubleshoot or repair Miidual circuit cards.
7.5
out of adiustment condltttn, the partiiutar adiustrnent
adjustment procedure.
7.6
ing a visual tnspectlon of the circulry. Obvious trouble
symptoms such as hose connectttns, ovemeated. dts-
colored or burned components, open fuses. or bumed
and melted wire hsulatffn shoutd be corrected and the
cause determined before proceeding with more detailed
7.7
and checkmg for the presence or absence of Certain
control signals. Whenever a numbered test procedure
is encountered in the chart, service personnel should
m u s t
W - G
that
Qzz powar soumes Qrefuzzy disco"-
When a trouble symptom is localized to a faufty
If the suspected cause of a trouble symptom is an
Component failures are sometimes evident dur-
with the
equipment is
test
with sug-
I
I
I
I
I
I
I
I
I
I
I
I
I
I