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BULLETIN 1318 TROUBLESHOOTING GUIDE Page 1 of 10 CHART 1A. MOTOR WILL NOT START OR STOPS AND WILL NOT RESTART.
BULLETIN 1318 TROUBLESHOOTING GUIDE
Page 1 of 10
CHART 1A. MOTOR WILL NOT START OR STOPS AND WILL NOT RESTART.
Check continuity of
Fault/Safety
interlocks and
machine limit
switches.
No
Reset Fault/Safety
interlock or limit
switch and try
again.
If Fault tripping
persists,
investigate cause
and correct.
OK
Check AC input to
Drive section. Look
for "Drive Healthy"
LED illumination.
No
Check branch
disconnect and
associated fuses.
Check for low Trip
input or field loss.
Close disconnect or
replace fuses after
correcting Fault.
Correct cause of
low Trip input or
field loss.
OK
Check motor
armature voltage.
There should be
more than 5 Volts
at the armature
terminals.
No
Problem is in Drive
Controller or
interconnecting
wiring.
Proceed to Chart
1B or contact the
nearest Area
Service Center.
OK
Check motor
armature current. Is
voltage less than
100V?
No
Motor armature
circuit is open.
Repair or replace
motor. Replace
contact in DC loop
contactor.
YES
Is LED 2
illuminated?
Yes
Drive is "in current
limit." Is current
limit
pot set correctly?
Check motor shaft
for free rotation.
OK
Investigate and
rectify machine
mechanical
problem. BULLETIN 1318 TROUBLESHOOTING GUIDE
Page 2 of 10
CHART 1B. MOTOR WILL NOT START OR STOPS AND WILL NOT RESTART.
Check that the DC
loop or AC line
contactor is
energized.
No
Turn to Chart
1BB.
OK
Check AC power
input to
controller..
No
Check for blown
fuses F1, F2 and
external branch
circuit fusing.
Replace blown
fuses after
correcting Fault
condition.
OK
Check that the
RUN input,
terminal (36) is
more than 20V.
No
Check associated
relays supplying
the START and
STOP functions.
Replace as
necessary.
Refer to
schematic
diagrams and
trace problem or
call Field Service.
OK
Check external
SPEED reference
input circuits.
No
Check associated
relays and circuits
in motor control
logic. Replace
relay(s) as
necessary.
Refer to
schematic
diagrams and
trace problem or
call Field Service.
OK
Check Speed
reference input
from operator's
controls (run
mode only).
No
Refer to
schematic
diagrams and
check for
continuity in
external and
operator's SPEED
reference circuits.
OK
Repair or replace
circuitry as
necessary.
(CONTINUED ON NEXT PAGE....) 1318 TROUBLESHOOTING GUIDE
Page 3 of 10
CHART 1B (CONT.) MOTOR WILL NOT START OR STOPS AND WILL NOT RESTART.
OK
OK
Check external
SPEED reference
input circuits.
No
Check associated
relays and circuits
in motor control
logic.
Refer to
schematic
diagrams and
trace problem.
OK
OK
Check for firing
pulses at power
converter (pulse
transformer
inputs (R36).
No pulses.
Problem is in
electronic control.
Proceed to Chart
1C .
Pulses present.
Problem is in
power converter.
Proceed to Chart
!C. BULLETIN 1318 TROUBLESHOOTING GUIDE
Page 4 of 10
CHART 1BB. MOTOR WILL NOT START OR STOPS AND WILL NOT RESTART.
Check for AC and
+24V DC supply
voltage to control
logic relays.
No
Check for blown
fuses F5, F6, F8
and F9.
Replace blown
fuses after
correcting the
Fault condition.
OK
Check for
operation of AC
and DC
contactors.
Check coil circuit
continuity.
No
Contactor coil
circuit is open.
Replace
contactor.
OK
Check for
START/STOP
logic inputs.
No
Check operator's
pushbuttons and
interconnection
wiring.
Repair or replace
components,
correct wiring
errors, or repair
broken wires.
OK
Refer to
schematic
diagrams. Trace
and check relay
START sequence
and contact
operation.
Improper relay
logic sequence.
Dirty, broken, or
wrong relay
contacts.
Correct logic
sequence, correct
wiring erros,
repair or replace
components.
OK
Proceed to Chart
1C or call for
service. BULLETIN 1318 TROUBLESHOOTING GUIDE
Page 5 of 10
CHART 1C. MOTOR WILL NOT START OR STOPS AND WILL NOT RESTART.
Check +15V (8)
and -15V (9)
regulated power
supply outputs.
No
Problem is in
regulated DC
power supply. If
(5) is > 20V and
(7) more negative
than -20V, then
problem is in DC
power supply.
Replace Control
Board or repair
interconnections.
OK
Check SPEED
reference input to
speed amplifier
(26) or ram
generator (19).
10V = Max. Speed.
No
Refer to
schematic
diagrams and
check SPEED
reference circuits
for continuity or
correct voltage.
Yes
Replace
malfunctioning
component(s) or
repair wiring
external to the
Drive.
OK
Check SPEED
reference output
(38) of ramp
generator (if
used).
No
Ramp generator
or assoc iated
potentiometer(s)
has
malfunctioned.
Replace control
board.
OK
Check current
demand output of
speed amplifier
(23). +/- 5V = full
load current.
No
Is LED 2
illuminated? If
so, drive is in
current limit.
Checkf or correct
current limit
setting.
Replace control
board.
OK
Replace control
board.
No
Replace power
board or call field
service. BULLETIN 1318 TROUBLESHOOTING GUIDE
Page 6 of 10
CHART 2A. MOTOR RUNS AT HIGH SPEED WITH NO SPEED CONTROL.
Run motor
momentarily with
low SPEED
reference. Check
for voltage at tach
terminals.
No
Tach is not
generating
voltage or
coupling to the
motor has
loosened or
broken.
Repair coupling
or repair/replace
tach.
OK
Check for
presence of speed
feedback at
terminal (28). See
Note Below.
No
Open or short
circuit between
tach and motor
controller.
Trace cable for
open or short
circuit and repair
or replace the
cable.
OK
Check the SPEED
reference at
speed amplifier
(26) and ramp
generator (19).
No
Refer to
schematic
diagrams and
check external
SPEED reference
circuits for
voltage and
continuity.
Repair or replace
parts or wiring.
YES
Problem is in
controller.
Replace control
board or contact
field service.
NOTE: POLARITIES ARE DEPENDENT UPON REFERENCE POLARITY AND DIRECTION OF MOTOR
ROTATION. BULLETIN 1318 TROUBLESHOOTING GUIDE
Page 7 of 10
CHART 3A. MOTOR RUNS AT LOW SPEED WITH NO SPEED CONTROL.
With maximum
speed demand,
check for
presence of 10V
DC at terminals
(26) or (19).
No
Refer to
schematic
diagrams and
check external
SPEED reference
circuits for
correct voltage.
Repair or replace
parts and wiring.
YES
Check if motor is
in current limit.
(LED 2 is lit).
No
Problem is in the
motor controller.
Proceed to Chart
3C or call field
service.
YES
Check for motor
shunt field
voltage at motor
terminals. Should
be more than
180V.
No
Problem is in the
motor, controller,
or
interconnections.
Proceed to Chart
3B or refer
problem to field
service.
OK
Check that the
motor shund field
current is within
25% of
nameplate..
No
Motor shunt field
winding or circuit
is open.
Repair or replace
motor.
OK
Uncouple the
motor. Check if
motor now runs
normally.
No
Problem is in the
motor controller.
Proceed to Chart
3C or refer
problem to field
service.
YES
Mechanical
problem on the
machine. BULLETIN 1318 TROUBLESHOOTING GUIDE
Page 8 of 10
CHART 3B. MOTOR RUNS AT LOW SPEED WITH NO SPEED CONTROL.
Check for motor
shunt field
voltage at
termininal block
(Field + and Field
-). See Note 2.
No
Check for AC
input supply to
the field supply
circuit at L1 (FLD)
and L2 (FLD).
Check for blown
F3 and F4 fuses.
Correct fault,
replace blown
fuses or broken
wiring. If fuses
are OK replace
power board.
YES
Problem is in
controller. Refer
to field service.
NOTE 1: REFER TO SCHEMATIC DIAGRAMS FOR APPLICATION CIRCUITRY IN RESPECT TO
SPEED REFERENCE.
NOTE 2: LOSS OF SHUNT FIELD CURRENT WILL TRIP MOTOR FIELD LOSS PROTECTION IF
PROTECTION IS SELECTED (SW1-2 IS OPEN).
NOTE 3: LOSS OF CURRENT FEEDBACK WILL CAUSE SYSTEM INSTABILITY.
CHART 3C. MOTOR RUNS AT LOW SPEED WITH NO CONTROL.
Replace control
board.
Doesmotor
continue to run at
low speed.
No
Problem
corrected.
YES
Refer problem to
field service. BULLETIN 1318 TROUBLESHOOTING GUIDE
Page 9 of 10
CHART 4A. PERFISTANT FUSE ''BLOWING''.
Check for motor
shunt field
voltage at motor
terminals (more
than 180V).
No
Problem is in
motor controller
or
interconnections.
Proceed to Chart
4B or refer
problem to field
service.
Check for motor
shunt field current
(must be within
25% of motor
nameplate).
No
Open circuit
shunt field
winding.
Repair or replace
motor.
Check motr
armature,
commutator, and
brushgear for
damage or short
circuits.
Yes
Repair or replace
motor.
NO
Check that motor
shaft is free to
rotate. Check that
overload and fuse
ratings are
correct.
No
Correct the
situation.
YES
Problem is in
controller.
Proceed to Chart
4B or refer to field
service.
NOTE: LOSS OF SHUNT FIELD CURRENT WILL TRIP MOTOR FIELD PROTECTION IF
FIELD FAILURE PROTECTION IS SELECTED (SW1-2 IS OPEN). BULLETIN 1318 TROUBLESHOOTING GUIDE
Page 10 of 10
CHART 4B. PERSISTANT FUSE ''BLOWING''.
With motor
running at full
load, check
current feedback
at controller
terminal (41). +/-
1mA = 200% rated
controller current
No
Controller or
interconnection
problem. Call
field service. See
note 1.
YES
Check for motor
shunt field
voltage at
terminal block
(should be more
than 180V). See
note 2.
No
Check