Emerson Control Techniques Focus 3N, User Manual, Page: 63 / 82

Page 57
VERVIEW TROUBLESHOOTING O
ast and effective troubleshooting requires well-trained personnel supplied with the
ecessary test instruments as well as a sufficient stock of recommended spare parts.
l operation and
Su
F
n
Capable electronic technicians who have received training in the contro
who are familiar with the application are well qualified to service this equipment.
ggested Training
A. Study the system instruction manual and control drawings.
B. Obtain practical experie
d in future servicing.
C. Train in the use of test instruments.
nce during the system installation an
Maintenance Records
lt is strongly recommended that the user keeps records of downtime, symptoms, re
of various checks, meter readings, etc. Such records will often help a service engi
ate the problem in the minimum time, should such services be required.
neral Troubleshooting
sults
neer
loc
Ge
The most frequent causes of drive failure are:
B. C rcuit gr
C. Mechanic
g all wiring. Also
ting checks, and
check
lt shou
proble
motor be checked in the event of any driv
manua
Notes
A. Loose or broken wire connections.
i ounding within the interconnections or the power wiring.
al failure at the motor.
DO NOT make adjustments or replace components before checkin
monitor all LED indicator lights before proceeding with troubleshoo
for blown fuses.
ld be noted that modern solid state electronic circuitry is highly reliable. Often
e ms, which appear to be electrical, are actually mechanical. It is advised that th
e problems. Refer to the motor owner’s
l for maintenance and repair procedures.
for a Troubleshooting Technician
A mini
t it is necessary to be able to
read th
Ho
sub
mum knowledge of system operation is required, bu
e system schematics and connection diagrams.
An oscilloscope may be needed to locate problem areas and to make adjustments.
wever, the majority of problems can be solved by using a multimeter and by parts
stitution.
HEN A TEST INSTRUMENT IS BEING USED, W TAKEN TO INSURE THAT ITS CARE MUST BE
CHASSIS IS NOT GROUNDED EITHER BY A GROUNDING PLUG CONNECTION OR BY ITS
CASE BEING IN CONTACT WITH A GROUNDED SURFACE
. EXTREME CARE MUST
AKEN WHEN USING THE OSCILLOSCOPE SINCE ITS CHASSIS WILL BE E
BE
T LECTRICALLY
HOT TO GROUND WHEN CONNECTED TO THE CONTROL SYSTEM.