RBS2C-A
22
7. Motor won’t reach
top speed
Low line voltage
Check for rated line voltage,
±
10%, on the
controller line terminals.
Motor overloaded
Check shunt field current.
a
Low shunt field
current causes excessive armature current. If
field current is adequate, check for a mechani-
cal overload. If the unloaded motor shaft does
not rotate freely, check motor bearings. Also
check for a shorted motor armature. Motor
overload can also be caused by incorrect gear
ratio. Correct accordingly.
Maximum speed set too low
Turn the MAX SPD potentiometer clockwise.
Current limit set too low
Turn the CUR LMT potentiometer clockwise.
Current Scaling Jumper J4 in wrong
position
See Step 3 and Table 2, pages 4 and 5.
Motor field demagnetized
b
Replace the motor.
Control board failure
Replace the control board.
8. Unstable speed
AC line voltage fluctuating
Observe line voltage with a voltmeter or oscil-
loscope. If fluctuations occur, correct condi-
tion accordingly.
Loose or corroded connection. Wiring
faulty, incorrect, or grounded
Check all terminals, connections, and wiring
between the line, operator controls, controller,
and motor.
Oscillating load connected to the
motor
Stabilize the load. Turning the IR/TACH
potentiometer counterclockwise may mini-
mize oscillations.
Voltage Selection Jumpers J1, J2, J3 in
wrong position
See Step 4 on page 5 under, “Installing The
Controller.”
IR compensation not adjusted cor-
rectly
See the IR Compensation adjustment instruc-
tions on pages 17 and 18.
Maximum speed not adjusted correctly
See the Maximum Speed (Armature Feed-
back) adjustment instructions on page 18.
Motor faulty
Check motor brushes. Replace if needed.
Repair or replace the motor.
Tachometer generator or coupling
faulty (if used)
Repair accordingly.
TABLE 5. TROUBLESHOOTING
INDICATION
POSSIBLE CAUSE
CORRECTIVE ACTION
(Contd on next page)
®
DIST. AUTORIZADO
MEX (55) 53 63 23 31
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MTY (81) 83 54 10 18
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