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ASIC TROUBLESHOOTING
B
des
This paragraph contains a basic list of symptoms of an improperly functioning control.
Included in the list are possible causes and corrective measures for each symptom
cribed.
CONTROL APPEARS TO BE DEAD
:
Terminals TB2-1 and –2 on the main PC board not jumpered together - install either
A.
a jumper or the Motor Thermostat between these terminals.
rol incorrectly wired - recheck all wiring.
. Defective Start/Stop switch, component on main PC board, or rectifier cube -
replace
G. Sp
B. No AC power - apply AC power and measure L1 and L2 for correct voltage.
C. Blown line fuses - replace line fuses.
D. Loose connections -turn off AC power and tighten connections.
E. Cont
F
bad components as required. (
See Critical Components
)
eed potentiometer set to zero - slowly advance from zero to begin motor rotation
.
LINE FUSES BLOW OR MAIN CIRCUIT BREAKER TRIPS WHEN APPLYING AC POWER:
A. Control is wired to AC voltage exceeding control rating -rewire control to proper AC
voltage or use step-down transformer.
B. Rectifier cube, field diodes on main PC board, motor winding or suppressor network
shorted, or a short to ground is present - locate and remove short.
C. Improper wiring or jumper programming during installation.
D. Defective main PC board component - replace as required. (
See Critical
Components
)
E. Motor shaft jammed - determine cause and correct.
F. Excessive carbon dust from brushes in motor - determine cause and correct.
FUSES BLOW WHEN SPEED POTENTIOMETER IS ADVANCED FROM ZERO:
A. Motor is overloaded - reduce load as required.
B. Motor is defective - consult motor instruction manual and repair or replace motor
as required.
C. Current limit adjustment set too high - readjust
ACCEL TIME IS MUCH LONGER THAN EXPECTED:
A. Check Accel pot setting
B Motor overloaded – reduce or remove load and re-check
DECEL TIME IS MUCH LONGER THAN EXPECTED:
A. Check Decel pot setting
B. Motor is being overhauled by another motor in system or by inertia of the machine
MOTOR DOES NOT REACH FULL SPEED:
A. Motor is overloaded - correct overload condition.
B. Maximum Speed potentiometer (MAX) is set too low -adjust MAX potentiometer
clockwise.
C. Low AC line voltage (more than 10% below nominal) -check AC line voltage and
correct.
D. Current limit set too low – re-adjust.
E. Incorrect jumper programming of JP9 - follow programming procedure
F. Defective rectifier cube - replace as required. (
See Critical Components
)
G. Motor brushes worn - replace as specified in motor instruction manual.
PROCEEDING WITH ANY MAINTENANCE OR TROUBLE-SHO
, ALL POWER SOURCES MUST BE DISCONNECTED.
BEFORE
OTING
CTIVITY
A
Summary of Contents for Control Techniques Focus 3N
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Page 52: ...Page 46 Tuning Adjus Optional tments Current Ref Gain Speed Ref Gain Zero Bias ...
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